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                                                                  Execution Copy



                             UNDERWRITING AGREEMENT

                                October 13, 2000


Robertson Stephens, Inc.
SG Cowen Securities Corporation
Thomas Weisel Partners LLC
Robert W. Baird & Co. Incorporated
As Representatives of the several Underwriters
c/o Robertson Stephens, Inc.
555 California Street, Suite 2600
San Francisco, CA  94104

Ladies and Gentlemen:

         INTRODUCTORY. Plexus Corp., a Wisconsin corporation (the "Company"),
proposes to issue and sell to the several underwriters named in Schedule A (the
"Underwriters") an aggregate of 3,000,000 shares (the "Firm Shares") of its
Common Stock, par value $.01 per share, together with each associated preferred
stock purchase right under the Rights Agreement, dated as of August 13, 1998,
between the Company and Firstar Bank, N.A., as Rights Agent (the "Common
Shares"). In addition, the Company will grant to the Underwriters an option to
purchase up to an additional 450,000 Common Shares (the "Option Shares") as
provided in Section 2. The Firm Shares and, if and to the extent such option is
exercised, the Option Shares are collectively called the "Shares". Robertson
Stephens, Inc. ("Robertson Stephens"), SG Cowen Securities Corporation, Thomas
Weisel Partners LLC and Robert W. Baird & Co. Incorporated have agreed to act as
representatives of the several Underwriters (in such capacity, the
"Representatives") in connection with the offering and sale of the Shares.

         The Company has prepared and filed with the Securities and Exchange
Commission (the "Commission") a registration statement on Form S-3 (File No.
333-45116), which contains a form of prospectus to be used in connection with
the public offering and sale of the Shares and such other securities that may be
offered from time to time in accordance with Rule 415 promulgated by the
Commission under the Securities Act (as defined below). Each such prospectus,
subject to completion, used in connection with such public offering is called a
"preliminary prospectus". Such registration statement, as amended, including the
financial statements, exhibits and schedules thereto, in the form in which it
was declared effective by the Commission under the Securities Act of 1933 and
the rules and regulations promulgated thereunder (collectively, the "Securities
Act"), including all documents incorporated or deemed to be incorporated by
reference therein and any information deemed to be a part thereof under the
Securities Act or the Securities Exchange Act of 1934 and the rules and
regulations promulgated thereunder (collectively, the "Exchange Act"), is called
the "Registration Statement". The Registration Statement has been declared
effective by the Commission. Any

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registration statement filed by the Company pursuant to Rule 462(b) under the
Securities Act is called the "Rule 462(b) Registration Statement", and from and
after the date and time of filing of the Rule 462(b) Registration Statement the
term "Registration Statement" shall include the Rule 462(b) Registration
Statement. Such prospectus, in the form first used by the Underwriters to
confirm sales of the Shares, is called the "Prospectus". All references in this
Agreement to the Registration Statement, the Rule 462(b) Registration Statement,
a preliminary prospectus, the Prospectus or any amendments or supplements to any
of the foregoing, shall include any copy thereof filed with the Commission
pursuant to its Electronic Data Gathering, Analysis and Retrieval System
("EDGAR"). All references in this Agreement to financial statements and
schedules and other information which is "contained," "included" or "stated" in
the Registration Statement or the Prospectus (and all other references of like
import) shall be deemed to mean and include all such financial statements and
schedules and other information that is or is deemed to be incorporated by
reference in the Registration Statement or the Prospectus, as the case may be;
and all references in this Agreement to amendments or supplements to the
Registration Statement or the Prospectus shall be deemed to mean and include the
filing of any document under the Exchange Act that is or is deemed to be
incorporated by reference in the Registration Statement or the Prospectus, as
the case may be.

         The Company hereby confirms its agreements with the Underwriters as
follows:

         SECTION 1. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company
hereby represents, warrants and covenants to each Underwriter as follows:

         (a) Compliance with Registration Requirements. The Registration
Statement and any Rule 462(b) Registration Statement have been declared
effective by the Commission under the Securities Act. The Company has complied
to the Commission's satisfaction with all requests of the Commission for
additional or supplemental information. No stop order suspending the
effectiveness of the Registration Statement or any Rule 462(b) Registration
Statement is in effect and no proceedings for such purpose have been instituted
or are pending or, to the best knowledge of the Company, are contemplated or
threatened by the Commission.

         Each preliminary prospectus and the Prospectus when filed complied in
all material respects with the Securities Act and, if filed by electronic
transmission by EDGAR (except as may be permitted by Regulation S-T under the
Securities Act), was identical to the copy thereof delivered to the Underwriters
for use in connection with the offer and sale of the Shares. Each of the
Registration Statement, any Rule 462(b) Registration Statement and any
post-effective amendment thereto, at the time it became effective and at all
subsequent times, complied and will comply in all material respects with the
Securities Act and did not and will not contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein not misleading. Each preliminary
prospectus, as of its date, and the Prospectus, as amended or supplemented, as
of its date and at all subsequent times through the thirtieth (30th) day after
the date hereof, did not and will not contain any untrue statement of a material
fact or omit to state a material fact necessary in order to make the statements
therein, in the light of the circumstances under which they were made, not
misleading. The representations and warranties set forth in the two immediately
preceding sentences do not apply to statements in or omissions from the
Registration Statement, any Rule 462(b) Registration Statement, or any
post-effective amendment thereto, or the Prospectus, or any amendments or
supplements thereto, made in reliance upon and in conformity with information
relating to any Underwriter furnished to the Company in writing by the
Representatives expressly for use therein. There are no contracts or other
documents

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required to be described in the Prospectus or to be filed as exhibits to the
Registration Statement that have not been described or filed as required.

         (b) Offering Materials Furnished to Underwriters. The Company has
delivered to the Representatives four complete conformed copies of the
Registration Statement and of each consent and certificate of experts filed as a
part thereof, and conformed copies of the Registration Statement (without
exhibits) and preliminary prospectuses and the Prospectus, as amended or
supplemented, in such quantities and at such places as the Representatives have
reasonably requested for each of the Underwriters.

         (c) Distribution of Offering Material By the Company. The Company has
not distributed and will not distribute, prior to the later of the Second
Closing Date (as defined below) and the completion of the Underwriters'
distribution of the Shares, any offering material in connection with the
offering and sale of the Shares other than a preliminary prospectus, the
Prospectus or the Registration Statement.

         (d) The Underwriting Agreement. This Agreement has been duly
authorized, executed and delivered by, and is a valid and binding agreement of,
the Company, enforceable in accordance with its terms, except as rights to
indemnification hereunder may be limited by applicable law and except as the
enforcement hereof may be limited by bankruptcy, insolvency, reorganization,
moratorium or other similar laws relating to or affecting the rights and
remedies of creditors or by general equitable principles.

         (e) Authorization of the Shares. The Shares to be purchased by the
Underwriters from the Company have been duly authorized for issuance and sale
pursuant to this Agreement and, when issued and delivered by the Company
pursuant to this Agreement, will be validly issued, fully paid and
nonassessable, subject to Section 180.0622(2)(b) of the Wisconsin Business
Corporation Law.

         (f) No Applicable Registration or Other Similar Rights. There are no
persons with registration or other similar rights to have any equity or debt
securities of the Company registered for sale under the Registration Statement
or included in the offering contemplated by this Agreement.

         (g) No Material Adverse Change. Subsequent to the respective dates as
of which information is given in the Prospectus: (i) there has been no material
adverse change, or any development that could reasonably be expected to result
in a material adverse change, in the condition, financial or otherwise, or in
the earnings, business, operations or prospects, whether or not arising from
transactions in the ordinary course of business, of the Company and its
subsidiaries, considered as one entity (any such change or effect, where the
context so requires, is called a "Material Adverse Change" or a "Material
Adverse Effect"); (ii) the Company and its subsidiaries, considered as one
entity, have not incurred any material liability or obligation, indirect, direct
or contingent, not in the ordinary course of business nor entered into any
material transaction or agreement not in the ordinary course of business; and
(iii) there has been no dividend or distribution of any kind declared, paid or
made by the Company or, except for dividends paid to the Company or other
subsidiaries, any of its subsidiaries on any class of capital stock or
repurchase or redemption by the Company or any of its subsidiaries of any class
of capital stock.

         (h) Independent Accountants. PricewaterhouseCoopers LLP, Ernst & Young
LLP and Deloitte & Touche LLP, who have expressed their opinions with respect to
the financial


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statements (which term as used in this Agreement includes the related notes
thereto) and supporting schedules filed with the Commission as a part of the
Registration Statement and included in the Prospectus, are independent public or
certified public accountants as required by the Securities Act and the Exchange
Act.

         (i) Preparation of the Financial Statements. The financial statements
filed with the Commission as a part of the Registration Statement and included
in the Prospectus present fairly the consolidated financial position of the
Company and its subsidiaries, SeaMED Corporation and the Contract Electronics
Manufacturing Services Operations of Elamex, S.A. de C.V., as the case may be,
as of and at the dates indicated and the results of operations and cash flows
for the periods specified. The supporting schedules included in the Registration
Statement present fairly the information required to be stated therein. Such
financial statements and supporting schedules have been prepared in conformity
with generally accepted accounting principles as applied in the United States
applied on a consistent basis throughout the periods involved, except as may be
expressly stated in the related notes thereto. No other financial statements or
supporting schedules are required to be included in the Registration Statement.
The financial data set forth in the Prospectus under the captions "Selected
Financial Data" and "Capitalization" fairly present the information set forth
therein on a basis consistent with that of the audited financial statements
contained in the Registration Statement and included in the Prospectus. The pro
forma condensed combined financial statements of the Company and its
subsidiaries and the related notes thereto included in the Prospectus and in the
Registration Statement present fairly the information contained therein, have
been prepared in accordance with the Commission's rules and guidelines with
respect to pro forma financial statements and have been properly presented on
the bases described therein, and the assumptions used in the preparation thereof
are reasonable and the adjustments used therein are appropriate to give effect
to the transactions and circumstances referred to therein. No other pro forma
financial information is required to be included in the Registration Statement
pursuant to Regulation S-X.

         (j) Company's Accounting System. The Company and each of its
subsidiaries maintain a system of accounting controls sufficient to provide
reasonable assurances that (i) transactions are executed in accordance with
management's general or specific authorization; (ii) transactions are recorded
as necessary to permit preparation of financial statements in conformity with
generally accepted accounting principles as applied in the United States and to
maintain accountability for assets; (iii) access to assets is permitted only in
accordance with management's general or specific authorization; and (iv) the
recorded accountability for assets is compared with existing assets at
reasonable intervals and appropriate action is taken with respect to any
differences.

         (k) Subsidiaries of the Company. The Company does not own or control,
directly or indirectly, any corporation, association or other entity other than
the subsidiaries listed in Exhibit A to this Agreement.

         (l) Incorporation and Good Standing or Active Status of the Company and
its Subsidiaries. Each of the Company and its subsidiaries has been duly
organized and is validly existing as a corporation or limited liability company,
as the case may be, in good standing or active status, as the case may be, under
the laws of the jurisdiction in which it is organized with full corporate power
and authority to own its properties and conduct its business as described in the
Prospectus, and is duly qualified to do business as a foreign corporation and is
in good standing or active status, as the case may be, under the laws of each
jurisdiction which requires such qualification.


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         (m) Capitalization of the Subsidiaries. All the outstanding shares of
capital stock of each subsidiary have been duly and validly authorized and
issued and are fully paid and nonassessable, and, except as otherwise set forth
in the Prospectus, all outstanding shares of capital stock of the subsidiaries
are owned by the Company either directly or through wholly owned subsidiaries
(or nominees, to the extent required under foreign law) free and clear of any
security interests, claims, liens or encumbrances.

         (n) No Prohibition on Subsidiaries from Paying Dividends or Making
Other Distributions. No subsidiary of the Company is currently prohibited,
directly or indirectly, from paying any dividends to the Company, from making
any other distribution on such subsidiary's capital stock, from repaying to the
Company any loans or advances to such subsidiary from the Company or from
transferring any of such subsidiary's property or assets to the Company or any
other subsidiary of the Company, except as described in or contemplated by the
Prospectus.

         (o) Capitalization and Other Capital Stock Matters. The authorized,
issued and outstanding capital stock of the Company is as set forth in the
Prospectus under the caption "Capitalization" (other than for subsequent
issuances, if any, pursuant to employee benefit plans described in the
Prospectus or upon exercise of outstanding options or warrants described in the
Prospectus). The Common Shares (including the Shares) conform in all material
respects to the description thereof contained in the Prospectus. All of the
issued and outstanding Common Shares have been duly authorized and validly
issued, are fully paid and nonassessable and have been issued in compliance with
all applicable federal and state securities laws. None of the outstanding Common
Shares was issued in violation of any preemptive rights, rights of first refusal
or other similar rights to subscribe for or purchase securities of the Company.
There are no authorized or outstanding options, warrants, preemptive rights,
rights of first refusal or other rights to purchase, or equity or debt
securities convertible into or exchangeable or exercisable for, any capital
stock of the Company or any of its subsidiaries other than those accurately
described in the Prospectus. The description of the Company's stock option,
stock bonus and other stock plans or arrangements, and the options or other
rights granted thereunder, set forth in the Prospectus accurately and fairly
presents the information required to be shown with respect to such plans,
arrangements, options and rights.

         (p) Nasdaq National Market Quotation. The Shares are registered
pursuant to Section 12(g) of the Exchange Act and are quoted on the Nasdaq
National Market, and the Company has taken no action designed to, or likely to
have the effect of, terminating the registration of the Common Shares under the
Exchange Act or suspending or terminating the inclusion of the Common Shares on
the Nasdaq National Market, nor has the Company received any notification that
the Commission or the National Association of Securities Dealers, Inc. (the
"NASD") is contemplating terminating such registration or listing.

         (q) No Consents, Approvals or Authorizations Required. No consent,
approval, authorization, filing with or order of any court or governmental
agency or regulatory body is required in connection with the transactions
contemplated herein, except such as have been obtained or made under the
Securities Act and such as may be required (i) under the blue sky laws of any
jurisdiction in connection with the purchase and distribution of the Shares by
the Underwriters in the manner contemplated here and in the Prospectus or (ii)
by the NASD.

         (r) Non-Contravention of Existing Instruments and Agreements. Neither
the issue and sale of the Shares nor the consummation of any other of the
transactions herein contemplated nor the fulfillment of the terms hereof will
conflict with, result in a breach or


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violation or imposition of any lien, charge or encumbrance upon any property or
assets of the Company or any of its subsidiaries pursuant to (i) the articles or
bylaws of the Company or any of its subsidiaries, (ii) the terms of any
indenture, contract, lease, mortgage, deed of trust, note agreement, loan
agreement or other agreement, obligation, condition, covenant or instrument to
which the Company or any of its subsidiaries is a party or by which it or they
are bound or to which its or their property is subject or (iii) any statute,
law, rule, regulation, judgment, order or decree applicable to the Company or
any of its subsidiaries of any court, regulatory body, administrative agency,
governmental body, arbitrator or other authority having jurisdiction over the
Company or any of its subsidiaries or any of its or their properties.

         (s) No Defaults or Violations. Neither the Company nor any subsidiary
is in violation or default of (i) any provision of its articles or bylaws, (ii)
the terms of any indenture, contract, lease, mortgage, deed of trust, note
agreement, loan agreement or other agreement, obligation, condition, covenant or
instrument to which it is a party or by which it is bound or to which its
property is subject or (iii) any statute, law, rule, regulation, judgment, order
or decree of any court, regulatory body, administrative agency, governmental
body, arbitrator or other authority having jurisdiction over the Company or such
subsidiary or any of its properties, as applicable, except any such violation or
default which would not, singly or in the aggregate, result in a Material
Adverse Change.

         (t) No Actions, Suits or Proceedings. No action, suit or proceeding by
or before any court or governmental agency, authority or body or any arbitrator
involving the Company or any of its subsidiaries or its or their property is
pending or, to the best knowledge of the Company, threatened that (i) could
reasonably be expected to have a Material Adverse Effect on the performance of
this Agreement or the consummation of any of the transactions contemplated
hereby or (ii) could reasonably be expected to result in a Material Adverse
Effect.

         (u) All Necessary Permits, Etc. The Company and each subsidiary possess
such valid and current certificates, authorizations or permits issued by the
appropriate state, federal or foreign regulatory agencies or bodies necessary to
conduct their respective businesses, and neither the Company nor any subsidiary
has received any notice of proceedings relating to the revocation or
modification of, or non-compliance with, any such certificate, authorization or
permit which, singly or in the aggregate, if the subject of an unfavorable
decision, ruling or finding, could result in a Material Adverse Change.

         (v) Title to Properties. The Company and each of its subsidiaries have
good and marketable title to all the properties and assets reflected as owned in
the financial statements referred to in Section 1(i) above (or elsewhere in the
Prospectus), in each case free and clear of any security interests, mortgages,
liens, encumbrances, equities, claims and other defects, except such as do not
materially and adversely affect the value of such property and do not materially
interfere with the use made or proposed to be made of such property by the
Company or such subsidiary. The real property, improvements, equipment and
personal property held under lease by the Company or any subsidiary are held
under valid and enforceable leases, with such exceptions as are not material and
do not materially interfere with the use made or proposed to be made of such
real property, improvements, equipment or personal property by the Company or
such subsidiary.

         (w) Tax Law Compliance. The Company and its consolidated subsidiaries
have filed all necessary federal, state and foreign income and franchise tax
returns and have paid all taxes required to be paid by any of them and, if due
and payable, any related or similar assessment, fine or penalty levied against
any of them. The Company has made adequate charges, accruals

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and reserves in the applicable financial statements referred to in Section 1(i)
above in respect of all federal, state and foreign income and franchise taxes
for all periods as to which the tax liability of the Company or any of its
consolidated subsidiaries has not been finally determined. The Company is not
aware of any tax deficiency that has been or might be asserted or threatened
against the Company that could result in a Material Adverse Change.

         (x) Intellectual Property Rights. Each of the Company and its
subsidiaries owns or possesses adequate rights to use all patents, patent rights
or licenses, inventions, collaborative research agreements, trade secrets,
know-how, trademarks, service marks, trade names and copyrights which are
necessary to conduct its businesses as described in the Registration Statement
and Prospectus; the expiration of any patents, patent rights, trade secrets,
trademarks, service marks, trade names or copyrights would not result in a
Material Adverse Change that is not otherwise disclosed in the Prospectus; the
Company has not received any notice of, and has no knowledge of, any
infringement of or conflict with asserted rights of the Company by others with
respect to any patent, patent rights, inventions, trade secrets, know-how,
trademarks, service marks, trade names or copyrights; and the Company has not
received any notice of, and has no knowledge of, any infringement of or conflict
with asserted rights of others with respect to any patent, patent rights,
inventions, trade secrets, know-how, trademarks, service marks, trade names or
copyrights that, singly or in the aggregate, if the subject of an unfavorable
decision, ruling or finding, might have a Material Adverse Change. There is no
claim being made against the Company regarding patents, patent rights or
licenses, inventions, collaborative research, trade secrets, know-how,
trademarks, service marks, trade names or copyrights except such that would not
result in a Material Adverse Change. The Company and its subsidiaries do not in
the conduct of their business as now or proposed to be conducted as described in
the Prospectus infringe or conflict with any right or patent of any third party,
or any discovery, invention, product or process which is the subject of a patent
application filed by any third party, known to the Company or any of its
subsidiaries, which such infringement or conflict is reasonably likely to result
in a Material Adverse Change.

         (y) No Transfer Taxes or Other Fees. There are no transfer taxes or
other similar fees or charges under Federal law or the laws of any state, or any
political subdivision thereof, required to be paid in connection with the
execution and delivery of this Agreement or the issuance and sale by the Company
of the Shares.

         (z) Company Not an "Investment Company". The Company has been advised
of the rules and requirements under the Investment Company Act of 1940, as
amended (the "Investment Company Act"). The Company is not, and after receipt of
payment for the Shares will not be, an "investment company" or an entity
"controlled" by an "investment company" within the meaning of the Investment
Company Act and will conduct its business in a manner so that it will not become
subject to the Investment Company Act.

         (aa) Insurance. Each of the Company and its subsidiaries is insured by
recognized, financially sound and reputable institutions with policies in such
amounts and with such deductibles and covering such risks as are generally
deemed adequate and customary for their businesses including, but not limited
to, policies covering real and personal property owned or leased by the Company
and its subsidiaries against theft, damage, destruction, acts of vandalism,
general liability and Directors and Officers liability. The Company has no
reason to believe that it or any subsidiary will not be able (i) to renew its
existing insurance coverage as and when such policies expire or (ii) to obtain
comparable coverage from similar institutions as may be necessary or appropriate
to conduct its business as now conducted and at a cost that

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would not result in a Material Adverse Change. Neither of the Company nor any
subsidiary has been denied any insurance coverage which it has sought or for
which it has applied.

         (bb) Labor Matters. To the best of the Company's knowledge, no labor
disturbance by the employees of the Company or any of its subsidiaries exists or
is imminent; and the Company is not aware of any existing or imminent labor
disturbance by the employees of any of its principal suppliers, subassemblers,
value added resellers, subcontractors, original equipment manufacturers,
authorized dealers or international distributors that might be expected to
result in a Material Adverse Change.

         (cc) No Price Stabilization or Manipulation. The Company has not taken
and will not take, directly or indirectly, any action designed to or that might
be reasonably expected to cause or result in stabilization or manipulation of
the price of the Common Shares to facilitate the sale or resale of the Shares.

         (dd) Lock-Up Agreements. Each executive officer and director of the
Company has agreed to sign an agreement substantially in the form attached
hereto as Exhibit B (the "Lock-up Agreements"). The Company has provided to
counsel for the Underwriters a complete and accurate list of all securityholders
of the Company and the number and type of securities held by each
securityholder. The Company has provided to counsel for the Underwriters true,
accurate and complete copies of all of the Lock-up Agreements presently in
effect or effected hereby. The Company hereby represents and warrants that it
will not release any of its executive officers or directors from any Lock-up
Agreements currently existing or hereafter effected without the prior written
consent of Robertson Stephens.

         (ee) Related-Party Transactions. There are no business relationships or
related-party transactions involving the Company or any subsidiary or any other
person required to be described in the Prospectus which have not been described
as required.

         (ff) No Unlawful Contributions or Other Payments. Neither the Company
nor any of its subsidiaries nor, to the best of the Company's knowledge, any
employee or agent of the Company or any subsidiary, has made any contribution or
other payment to any official of, or candidate for, any federal, state or
foreign office in violation of any law or of the character required to be
disclosed in the Prospectus.

         (gg) Environmental Laws. The Company and its subsidiaries (i) are in
material compliance with all rules, laws and regulations relating to the use,
treatment, storage and disposal of toxic substances and protection of health or
the environment ("Environmental Laws") that are applicable to their business,
except where the failure to comply would not result in a Material Adverse
Change, (ii) have received no notice from any governmental authority or third
party of an asserted claim under Environmental Laws, which claim is required to
be disclosed in the Registration Statement and the Prospectus, (iii) are not
currently aware that it will be required to make future material capital
expenditures to comply with Environmental Laws and (iv) do not own, lease or
occupy any property that has been designated as a Superfund site pursuant to the
Comprehensive Response, Compensation, and Liability Act of 1980, as amended (42
U.S.C. ss. 9601, et seq.), or otherwise designated as a contaminated site under
applicable state or local law.

         (hh) ERISA Compliance. The Company and its subsidiaries and any
"employee benefit plan" (as defined under the Employee Retirement Income
Security Act of 1974, as amended, and the regulations and published
interpretations thereunder (collectively, "ERISA"))

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established or maintained by the Company, its subsidiaries or their "ERISA
Affiliates" (as defined below) are in compliance in all material respects with
ERISA. "ERISA Affiliate" means, with respect to the Company or a subsidiary, any
member of any group of organizations described in Sections 414(b),(c),(m) or (o)
of the Internal Revenue Code of 1986, as amended, and the regulations and
published interpretations thereunder (the "Code") of which the Company or such
subsidiary is a member. No "reportable event" (as defined under ERISA) has
occurred or is reasonably expected to occur with respect to any "employee
benefit plan" established or maintained by the Company, its subsidiaries or any
of their ERISA Affiliates. No "employee benefit plan" established or maintained
by the Company, its subsidiaries or any of their ERISA Affiliates, if such
"employee benefit plan" were terminated, would have any "amount of unfounded
benefit liabilities" (as defined under ERISA). Neither the Company, its
subsidiaries nor any of their ERISA Affiliates has incurred or reasonably
expects to incur any liability under (i) Title IV of ERISA with respect to
termination of, or withdrawal from, any "employee benefit plan" or (ii) Sections
412, 4971, 4975 or 4980B of the Code. Each "employee benefit plan" established
or maintained by the Company, its subsidiaries or any of their ERISA Affiliates
that is intended to be qualified under Section 401(a) of the Code is so
qualified and nothing has occurred, whether by action or failure to act, which
would cause the loss of such qualification.

         (ii) Exchange Act Compliance. The documents incorporated or deemed to
be incorporated by reference in the Prospectus, at the time they were or
hereafter are filed with the Commission, complied and will comply in all
material respects with the requirements of the Exchange Act, and, when read
together with the other information in the Prospectus, at the time the
Registration Statement and any amendments thereto become effective and at the
First Closing Date (as defined below) and the Second Closing Date (as defined
below), as the case may be, will not contain an untrue statement of a material
fact or omit to state a material fact required to be stated therein or necessary
to make the fact required to be stated therein or necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading.

         (jj) Reports Filed. The Company has filed all reports required to be
filed pursuant to the Securities Act and the Exchange Act since October 1, 1997.

         (kk) Conditions for Use of Form S-3. The Company has satisfied the
conditions for the use of Form S-3, as set forth in the general instructions
thereto, with respect to the Registration Statement.

         Any certificate signed by an officer of the Company and delivered to
the Representatives or to counsel for the Underwriters shall be deemed to be a
representation and warranty by the Company to each Underwriter as to the matters
set forth therein.

         SECTION 2. PURCHASE, SALE AND DELIVERY OF THE SHARES.

         (a) The Firm Shares. The Company agrees to issue and sell to the
several Underwriters the Firm Shares upon the terms herein set forth. On the
basis of the representations, warranties and agreements herein contained, and
upon the terms but subject to the conditions herein set forth, the Underwriters
agree, severally and not jointly, to purchase from the Company the respective
number of Firm Shares set forth opposite their names on Schedule A. The purchase
price per Firm Share to be paid by the several Underwriters to the Company shall
be $47.625 per share.


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         (b) The First Closing Date. Delivery of the Firm Shares to be purchased
by the Underwriters and payment therefor shall be made by the Company and the
Representatives at 6:00 a.m. San Francisco time, at the offices of Quarles &
Brady LLP, 411 East Wisconsin Avenue, Milwaukee, Wisconsin 53202-4497 (or at
such other place as may be agreed upon among the Representatives and the
Company), (i) on the third (3rd) full business day following the first day that
Shares are traded, (ii) if this Agreement is executed and delivered after 1:30
P.M., San Francisco time, the fourth (4th) full business day following the day
that this Agreement is executed and delivered or (iii) at such other time and
date not later than seven (7) full business days following the first day that
Shares are traded as the Representatives and the Company may determine (or at
such time and date to which payment and delivery shall have been postponed
pursuant to Section 8 hereof), such time and date of payment and delivery being
herein called the "First Closing Date;" provided, however, that if the Company
has not made available to the Representatives copies of the Prospectus within
the time provided in Section 2(g) and 3(e) hereof, the Representatives may, in
their sole discretion, postpone the First Closing Date until no later than two
(2) full business days following delivery of copies of the Prospectus to the
Representatives.

         (c) The Option Shares; the Second Closing Date. In addition, on the
basis of the representations, warranties and agreements herein contained, and
upon the terms but subject to the conditions herein set forth, the Company
hereby grants an option to the several Underwriters to purchase, severally and
not jointly, up to an aggregate of 450,000 Option Shares from the Company at the
purchase price per share to be paid by the Underwriters for the Firm Shares. The
option granted hereunder is for use by the Underwriters solely in covering any
over-allotments in connection with the sale and distribution of the Firm Shares.
The option granted hereunder may be exercised at any time upon notice by the
Representatives to the Company which notice may be given at any time within
thirty (30) days from the date of this Agreement. The time and date of delivery
of the Option Shares, if subsequent to the First Closing Date, is called the
"Second Closing Date" and shall be determined by the Representatives and shall
not be earlier than three nor later than five full business days after delivery
of such notice of exercise. If any Option Shares are to be purchased, each
Underwriter agrees, severally and not jointly, to purchase the number of Option
Shares (subject to such adjustments to eliminate fractional shares as the
Representatives may determine) that bears the same proportion to the total
number of Option Shares to be purchased as the number of Firm Shares set forth
on Schedule A opposite the name of such Underwriter bears to the total number of
Firm Shares. The Representatives may cancel the option at any time prior to its
expiration by giving written notice of such cancellation to the Company.

         (d) Public Offering of the Shares. The Representatives hereby advise
the Company that the Underwriters intend to offer for sale to the public, as
described in the Prospectus, their respective portions of the Shares as soon
after this Agreement has been executed and the Registration Statement has been
declared effective as the Representatives, in their sole judgment, have
determined is advisable and practicable.

         (e) Payment for the Shares. Payment for the Shares shall be made at the
First Closing Date (and, if applicable, at the Second Closing Date) by wire
transfer of immediately available-funds to the order of the Company.

         It is understood that the Representatives have been authorized, for
their own account and the accounts of the several Underwriters, to accept
delivery of and receipt for, and make payment of the purchase price for, the
Firm Shares and any Option Shares the Underwriters have agreed to purchase.
Robertson Stephens or any of the other Representatives, individually


                                       10.
   11

and not as Representative of the Underwriters, may (but shall not be obligated
to) make payment for any Shares to be purchased by any Underwriter whose funds
shall not have been received by the Representatives by the First Closing Date or
the Second Closing Date, as the case may be, for the account of such
Underwriter, but any such payment shall not relieve such Underwriter from any of
its obligations under this Agreement.

         (f) Delivery of the Shares. The Company shall deliver, or cause to be
delivered, a credit representing the Firm Shares to an account or accounts at
The Depository Trust Company, as designated by the Representatives for the
accounts of the Representatives and the several Underwriters at the First
Closing Date, against the irrevocable release of a wire transfer of immediately
available funds for the amount of the purchase price therefor. The Company shall
also deliver, or cause to be delivered, a credit representing the Option Shares
the Underwriters have agreed to purchase at the First Closing Date (or the
Second Closing Date, as the case may be), to an account or accounts at The
Depository Trust Company as designated by the Representatives for the accounts
of the Representatives and the several Underwriters, against the irrevocable
release of a wire transfer of immediately available funds for the amount of the
purchase price therefor. Time shall be of the essence, and delivery at the time
and place specified in this Agreement is a further condition to the obligations
of the Underwriters.

         (g) Delivery of Prospectus to the Underwriters. Not later than 9:00
a.m. San Francisco time on the second business day following the date the Shares
are released by the Underwriters for sale to the public, the Company shall
deliver or cause to be delivered copies of the Prospectus in such quantities and
at such places as the Representatives shall request.

         SECTION 3. COVENANTS OF THE COMPANY. The Company further covenants and
agrees with each Underwriter as follows:

         (a) Registration Statement Matters. The Company will (i) prepare and
timely file with the Commission under Rule 424(b) under the Securities Act the
Prospectus in a form approved by the Representatives setting forth the number of
Shares covered thereby, the names of the Underwriters and the number of Shares
that the Underwriters have agreed to purchase, the price at which the Shares are
to be purchased by the Underwriters from the Company and such other information
as the Company and the Underwriters deem appropriate in connection with the
offering of the Shares and (ii) not file any amendment to the Registration
Statement or supplement to the Prospectus of which the Representatives shall not
previously have been advised and furnished with a copy or to which the
Representatives shall have reasonably objected in writing or which is not in
compliance with the Securities Act. If the Company elects to rely on Rule 462(b)
under the Securities Act, the Company shall file a Rule 462(b) Registration
Statement with the Commission in compliance with Rule 462(b) under the
Securities Act prior to the time confirmations are sent or given, as specified
by Rule 462(b)(2) under the Securities Act, and shall pay the applicable fees in
accordance with Rule 111 under the Securities Act.

         (b) Securities Act Compliance. The Company will advise the
Representatives promptly (i) when the Registration Statement or any
post-effective amendment thereto shall have become effective, (ii) of receipt of
any comments from the Commission, (iii) of any request of the Commission for
amendment of the Registration Statement or for supplement to the Prospectus or
for any additional information and (iv) of the issuance by the Commission of any
stop order suspending the effectiveness of the Registration Statement or the use
of the Prospectus or of the institution of any proceedings for that purpose. The
Company will use its


                                      11.
   12

best efforts to prevent the issuance of any such stop order preventing or
suspending the use of the Prospectus and to obtain as soon as possible the
lifting thereof, if issued.

         (c) Blue Sky Compliance. The Company will cooperate with the
Representatives and counsel for the Underwriters in endeavoring to qualify the
Shares for sale under the securities laws of such jurisdictions (both national
and foreign) as the Representatives may reasonably have designated in writing
and will make such applications, file such documents, and furnish such
information as may be reasonably required for that purpose, provided the Company
shall not be required to qualify as a foreign corporation or to file a general
consent to service of process in any jurisdiction where it is not now so
qualified or required to file such a consent. The Company will, from time to
time, prepare and file such statements, reports and other documents, as are or
may be required to continue such qualifications in effect for so long a period
as the Representatives may reasonably request for distribution of the Shares.

         (d) Amendments and Supplements to the Prospectus and Other Securities
Act Matters. The Company will comply with the Securities Act and the Exchange
Act, and the rules and regulations of the Commission thereunder, so as to permit
the completion of the distribution of the Shares as contemplated by this
Agreement and the Prospectus. If during the period in which a prospectus is
required by law to be delivered by an Underwriter or dealer, any event shall
occur as a result of which, in the judgment of the Company, the Representatives
or counsel for the Underwriters, it becomes necessary to amend or supplement the
Prospectus in order to make the statements therein, in the light of the
circumstances existing at the time the Prospectus is delivered to a purchaser,
not misleading, or, if it is necessary at any time to amend or supplement the
Prospectus to comply with any law, the Company promptly will prepare and file
with the Commission, and furnish at its own expense to the Underwriters and to
dealers, an appropriate amendment to the Registration Statement or supplement to
the Prospectus so that the Prospectus as so amended or supplemented will not, in
the light of the circumstances when it is so delivered, be misleading, or so
that the Prospectus will comply with the law.

         (e) Copies of any Amendments and Supplements to the Prospectus. The
Company agrees to furnish the Representatives, without charge, during the period
beginning on the date hereof and ending on the later of the First Closing Date
or such date, as in the opinion of counsel for the Underwriters, the Prospectus
is no longer required by law to be delivered in connection with sales by an
Underwriter or dealer (the "Prospectus Delivery Period"), as many copies of the
Prospectus and any amendments and supplements thereto (including any documents
incorporated or deemed incorporated by reference therein) as the Representatives
may request.

         (f) Insurance. The Company shall obtain Directors and Officers
liability insurance in the minimum amount of $10 million that shall apply to the
offering contemplated hereby.

         (g) Notice of Subsequent Events. If at any time during the ninety (90)
day period after the Registration Statement becomes effective, any rumor,
publication or event relating to or affecting the Company shall occur as a
result of which, in Robertson Stephens' reasonable opinion, the market price of
the Common Shares has been or is likely to be materially affected (regardless of
whether such rumor, publication or event necessitates a supplement to or
amendment of the Prospectus), the Company will, after written notice from
Robertson Stephens advising the Company to the effect set forth above, forthwith
prepare, consult with Robertson Stephens concerning the substance of and
disseminate a press release or other public

                                      12.
   13

statement, reasonably satisfactory to Robertson Stephens, responding to or
commenting on such rumor, publication or event.

         (h) Use of Proceeds. The Company shall apply the net proceeds from the
sale of the Shares sold by it in the manner described under the caption "Use of
Proceeds" in the Prospectus.

         (i) Transfer Agent. The Company has engaged and maintains, at its
expense, a registrar and transfer agent for the Common Shares.

         (j) Earnings Statement. As soon as practicable, the Company will make
generally available to its security holders and to the Representatives an
earnings statement (which need not be audited) covering the twelve-month period
ending September 30, 2001 that satisfies the provisions of Section 11(a) of the
Securities Act.

         (k) Periodic Reporting Obligations; Nasdaq Matters. During the
Prospectus Delivery Period the Company shall file, on a timely basis, with the
Commission and The Nasdaq Stock Market, Inc. all reports and documents required
to be filed under the Exchange Act. The Company shall take such steps as shall
be necessary to maintain the inclusion of the Shares on the Nasdaq National
Market following the offering of the Shares.

         (l) Agreement Not to Offer or Sell Additional Securities. The Company
will not offer, sell or contract to sell, or otherwise dispose of or enter into
any transaction which is designed to, or could be expected to, result in the
disposition (whether by actual disposition or effective economic disposition due
to cash settlement or otherwise by the Company or any affiliate of the Company
or any person in privity with the Company or any affiliate of the Company)
directly or indirectly, or announce the offering of, any other Common Shares or
any securities convertible into, or exchangeable for, Common Shares; provided,
however, that the Company may issue (i) and sell Common Shares pursuant to any
director or employee stock option plan, stock ownership plan or dividend
reinvestment plan of the Company in effect at the date of the Prospectus and
described in the Prospectus so long as none of those shares may be transferred
and the Company shall enter stop transfer instructions with its transfer agent
and registrar against the transfer of any such Common Shares; (ii) Common Shares
issuable upon the conversion of securities or the exercise of warrants
outstanding at the date of the Prospectus and described in the Prospectus; (iii)
Common Shares or other securities as consideration for any acquisition by the
Company or in connection with any business transaction between the Company and a
third party, provided that the above consent obligation is expressly assumed in
writing by the recipient of the Common Shares or other securities (with a copy
to Robertson Stephens) and that the certificates for such Common Shares or other
securities contain a transfer-restrictive legend to such effect; and (iv) up to
300,000 Common Shares as consideration in connection with the proposed
acquisition of e2E Corporation that was announced by the Company on October 2,
2000. These restrictions terminate after the close of trading of the Shares on
the ninetieth (90th) day of (and including) the day the Shares commenced trading
on the Nasdaq National Market.

         (m) Future Reports to the Representatives. During the five-year period
following the date of this Agreement, the Company will use its reasonable best
efforts to furnish to the Representatives (i) as soon as practicable after the
end of each fiscal year, copies of the Annual Report of the Company containing
the balance sheet of the Company as of the close of such fiscal year and
statements of income, stockholders' equity and cash flows for the year then
ended and the opinion thereon of the Company's independent public or certified
public


                                      13.
   14

accountants; (ii) as soon as practicable after the filing thereof, copies of
each proxy statement, Annual Report on Form 10-K, Quarterly Report on Form 10-Q,
Current Report on Form 8-K or other report filed by the Company with the
Commission, The Nasdaq Stock Market, Inc. or any securities exchange; and (iii)
as soon as available, copies of any report or communication of the Company
mailed generally to holders of its capital stock.

         SECTION 4. CONDITIONS OF THE OBLIGATIONS OF THE UNDERWRITERS. The
obligations of the several Underwriters to purchase and pay for the Shares as
provided herein on the First Closing Date and, with respect to the Option
Shares, the Second Closing Date, shall be subject to the accuracy of the
representations and warranties of the Company set forth in Section 1 hereof as
of the date hereof and as of the First Closing Date as though then made and,
with respect to the Option Shares, as of the Second Closing Date as though then
made, to the timely performance by the Company of its covenants and other
obligations hereunder, and to each of the following additional conditions:

         (a) Compliance with Registration Requirements; No Stop Order; No
Objection from the NASD. The Registration Statement shall have become effective
prior to the execution of this Agreement, or at such later date as shall be
consented to in writing by Robertson Stephens; and no stop order suspending the
effectiveness thereof shall have been issued and no proceedings for that purpose
shall have been initiated or, to the knowledge of the Company or any
Underwriter, threatened by the Commission, and any request of the Commission for
additional information (to be included in the Registration Statement or the
Prospectus or otherwise) shall have been complied with to the satisfaction of
counsel for the Underwriters; and the NASD shall have raised no objection to the
fairness and reasonableness of the underwriting terms and arrangements.

         (b) Corporate Proceedings. All corporate proceedings and other legal
matters in connection with this Agreement, the form of Registration Statement
and the Prospectus, and the registration, authorization, issue, sale and
delivery of the Shares, shall have been reasonably satisfactory to counsel for
the Underwriters, and such counsel shall have been furnished with such papers
and information as they may reasonably have requested to enable them to pass
upon the matters referred to in this Section.

         (c) No Material Adverse Change. Subsequent to the execution and
delivery of this Agreement and prior to the First Closing Date or the Second
Closing Date, as the case may be, there shall not have been any Material Adverse
Change that, in the reasonable judgment of Robertson Stephens, is material and
adverse and that makes it, in the reasonable judgment of Robertson Stephens,
impracticable or inadvisable to proceed with the public offering of the Shares
as contemplated by the Prospectus.

         (d) Opinion of Counsel for the Company. You shall have received on the
First Closing Date or the Second Closing Date, as the case may be, an opinion of
Quarles & Brady LLP, counsel for the Company, substantially in the form of
Exhibit C attached hereto, dated the First Closing Date or the Second Closing
Date, as the case may be, addressed to the Underwriters and with reproduced
copies or signed counterparts thereof for each of the Underwriters.

         Counsel rendering the opinion contained in Exhibit C may rely as to
questions of law not involving the laws of the United States or the State of
Wisconsin upon opinions of local counsel, and as to questions of fact upon
representations or certificates of officers of the Company and of government
officials, in which case their opinion is to state that they are so relying and
that


                                      14.
   15


they have no knowledge of any material misstatement or inaccuracy in any such
opinion, representation or certificate. Copies of any opinion, representation or
certificate so relied upon shall be reasonably satisfactory to the
Representatives and shall be delivered to you, as the Representatives, and to
counsel for the Underwriters.

         (e) Opinion of Counsel for the Underwriters. The Representatives shall
have received on the First Closing Date or the Second Closing Date, as the case
may be, an opinion of Jones, Day, Reavis & Pogue, counsel for the Underwriters,
in form and substance satisfactory to the Representatives. The Company shall
have furnished to such counsel such documents as they may have requested for the
purpose of enabling them to pass upon such matters.

         (f) Accountants' Comfort Letters.

             (i)       You shall have received on the First Closing Date or the
             Second Closing Date, as the case may be, a letter from each of
             PricewaterhouseCoopers LLP, Ernst & Young LLP and Deloitte & Touche
             LLP, addressed to the Underwriters, dated the First Closing Date or
             the Second Closing Date, as the case may be, confirming that they
             are independent certified public accountants with respect to the
             Company within the meaning of the Securities Act and based upon the
             procedures described in such letters delivered to you concurrently
             with the execution of this Agreement (herein called an "Original
             Letter" or the "Original Letters"), but carried out to a date not
             more than four (4) business days prior to the First Closing Date or
             the Second Closing Date, as the case may be, (A) confirming, to the
             extent true, that the statements and conclusions set forth in the
             Original Letters are accurate as of the First Closing Date or the
             Second Closing Date, as the case may be, and (B) setting forth any
             revisions and additions to the statements and conclusions set forth
             in the Original Letters that are necessary to reflect any changes
             in the facts described in the Original Letters since the date of
             such letter, or to reflect the availability of more recent
             financial statements, data or information. The letter from
             PricewaterhouseCoopers LLP shall not disclose any change in the
             condition (financial or otherwise), earnings, operations, business
             or business prospects of the Company and its subsidiaries
             considered as one enterprise from that set forth in the
             Registration Statement or Prospectus, which, in the sole judgment
             of Robertson Stephens, is material and adverse and that makes it,
             in the sole judgment of Robertson Stephens, impracticable or
             inadvisable to proceed with the public offering of the Shares as
             contemplated by the Prospectus.

             (ii)      The Original Letter from PricewaterhouseCoopers LLP shall
             be addressed to or for the use of the Underwriters in form and
             substance satisfactory to the Underwriters and shall (A) represent,
             to the extent true, that they are independent certified public
             accountants with respect to the Company within the meaning of the
             Securities Act, (B) set forth their opinion with respect to their
             examination of the consolidated balance sheet of the Company as of
             September 30, 1998 and 1999 related consolidated statements of
             operations, stockholders' equity and cash flows for each of the
             years in the three-year period ended September 30, 1999, (C) state
             that (1) PricewaterhouseCoopers LLP has performed the procedures
             set out in Statement on Auditing Standards No. 71 ("SAS No. 71")
             for a review of interim financial information and providing the
             report of PricewaterhouseCoopers LLP as described in SAS No. 71 on
             the

                                       15.

   16


             financial statements for each of the quarters in the three-quarter
             period ended June 30, 2000 (the "Quarterly Financial Statements")
             and (2) in the course of such review, nothing came to their
             attention that leads them to believe that any material
             modifications need to be made to any of the Quarterly Financial
             Statements in order for them to be in compliance with generally
             accepted accounting principles consistently applied across the
             periods presented, (D) state that (1) PricewaterhouseCoopers LLP
             has performed the procedures set out in Statement on Auditing
             Standards No. 72 for providing negative assurance on the pro forma
             financial statements incorporated by reference into the
             Registration Statement and the Prospectus and (2) nothing came to
             their attention as a result of such procedures that leads them to
             believe that the pro forma financial statements incorporated by
             reference into the Registration Statement and the Prospectus do not
             comply as to form in all material respects with the applicable
             accounting requirements of Rule 11-02 of Regulation S-X and that
             the pro forma adjustments have not been properly applied to the
             historical amounts in the compilation of those statements and (E)
             address other matters agreed upon by PricewaterhouseCoopers LLP and
             the Representatives. In addition, the Representatives shall have
             received from PricewaterhouseCoopers LLP a letter addressed to the
             Company and made available to the Representatives for the use of
             the Underwriters stating that their review of the Company's system
             of internal accounting controls, to the extent they deemed such
             review necessary in establishing the scope of their examination of
             the Company's consolidated financial statements as of September 30,
             1999, did not disclose any weaknesses in internal controls that
             they considered to be material weaknesses.

             (iii)     The Original Letter from Ernst & Young LLP shall be
             addressed to or for the use of the Underwriters in form and
             substance satisfactory to the Underwriters and shall (A) represent,
             to the extent true, that they were independent certified public
             accountants with respect to SeaMED Corporation within the meaning
             of the Securities Act and (B) set forth their opinion with respect
             to their examination of the balance sheet of SeaMED Corporation as
             of June 30, 1998 and related statements of income, shareholders'
             equity and cash flows for each of the two years in the period ended
             June 30, 1998.

             (iv)      The Original Letter from Deloitte & Touche LLP shall be
             addressed to or for the use of the Underwriters in form and
             substance satisfactory to the Underwriters and shall (A) represent,
             to the extent true, that they were independent certified public
             accountants with respect to the Contract Electronics Manufacturing
             Services Operations of Elamex, S.A. de C.V. within the meaning of
             the Securities Act and (B) set forth their opinion with respect to
             their examination of the balance sheet of the Contract Electronics
             Manufacturing Services Operations of Elamex, S.A. de C.V. as of
             December 31, 1999 and the related statements of income and changes
             in parent company's investment and net advances and cash flows for
             the year ended December 31, 1999.

        (g)  Officers' Certificate. The Representatives shall have received on
the First Closing Date or the Second Closing Date, as the case may be, a
certificate of the Company, dated the First Closing Date or the Second Closing
Date, as the case may be, signed by the President and Chief Operating Officer
and the Senior Vice President - Chief Financial Officer of the Company, to the
effect that, and the Representatives shall be satisfied that:


                                      16.
   17


             (i)       The representations and warranties of the Company in this
             Agreement are true and correct, as if made on and as of the First
             Closing Date or the Second Closing Date, as the case may be, and
             the Company has complied with all the agreements and satisfied all
             the conditions on its part to be performed or satisfied at or prior
             to the First Closing Date or the Second Closing Date, as the case
             may be;

             (ii)      No stop order suspending the effectiveness of the
             Registration Statement has been issued and no proceedings for that
             purpose have been instituted or are pending or threatened under the
             Act;

             (iii)     When the Registration Statement became effective and at
             all times subsequent thereto up to the delivery of such
             certificate, the Registration Statement and the Prospectus, and any
             amendments or supplements thereto and any documents incorporated,
             or deemed to be incorporated by reference into the Registration
             Statement or the Prospectus, when such incorporated documents
             became effective or were filed with the Commission, contained all
             material information required to be included therein by the
             Securities Act or the Exchange Act and the applicable rules and
             regulations of the Commission thereunder, as the case may be, and
             in all material respects conformed to the requirements of the
             Securities Act or the Exchange Act and the applicable rules and
             regulations of the Commission thereunder, as the case may be, the
             Registration Statement and the Prospectus, and any amendments or
             supplements thereto, did not and does not include any untrue
             statement of a material fact or omit to state a material fact
             required to be stated therein or necessary to make the statements
             therein not misleading; and, since the effective date of the
             Registration Statement, there has occurred no event required to be
             set forth in an amended or supplemented Prospectus that has not
             been so set forth; and

             (iv)      Subsequent to the respective dates as of which
             information is given in the Registration Statement and Prospectus,
             there has not been (A) any material adverse change in the condition
             (financial or otherwise), earnings, operations, business or
             business prospects of the Company and its subsidiaries considered
             as one enterprise, (B) any transaction that is material to the
             Company and its subsidiaries considered as one enterprise, except
             transactions entered into in the ordinary course of business, (C)
             any obligation, direct or contingent, that is material to the
             Company and its subsidiaries considered as one enterprise, incurred
             by the Company or its subsidiaries, except obligations incurred in
             the ordinary course of business, (D) any change in the capital
             stock or outstanding indebtedness of the Company or any of its
             subsidiaries that is material to the Company and its subsidiaries
             considered as one enterprise, (E) any dividend or distribution of
             any kind declared, paid or made on the capital stock of the Company
             or any of its subsidiaries, or (F) any loss or damage (whether or
             not insured) to the property of the Company or any of its
             subsidiaries that has been sustained or will have been sustained
             that has a material adverse effect on the condition (financial or
             otherwise), earnings, operations, business or business prospects of
             the Company and its subsidiaries considered as one enterprise.


                                      17.
   18


             (h)       Lock-up Agreement from Certain Stockholders of the
             Company. The Company shall have obtained and delivered to you an
             agreement substantially in the form of Exhibit B attached hereto
             from each executive officer and director of the Company.

             (i)       Nasdaq National Market Quotation. The Shares shall have
             been approved for inclusion on the Nasdaq National Market, subject
             only to official notice of issuance.

             (j)       Compliance with Prospectus Delivery Requirements. The
             Company shall have complied with the provisions of Sections 2(g)
             and 3(e) hereof with respect to the furnishing of Prospectuses.

             (k)       Additional Documents. On or before each of the First
             Closing Date and the Second Closing Date, as the case may be, the
             Representatives and counsel for the Underwriters shall have
             received such information, documents and opinions as they may
             reasonably require for the purposes of enabling them to pass upon
             the issuance and sale of the Shares as contemplated herein, or in
             order to evidence the accuracy of any of the representations and
             warranties, or the satisfaction of any of the conditions or
             agreements, herein contained.

             If any condition specified in this Section 4 is not satisfied when
and as required to be satisfied, this Agreement may be terminated by the
Representatives by notice to the Company at any time on or prior to the First
Closing Date and, with respect to the Option Shares, at any time prior to the
Second Closing Date, which termination shall be without liability on the part of
any party to any other party, except that Section 5 (Payment of Expenses),
Section 6 (Reimbursement of Underwriters' Expenses), Section 7 (Indemnification
and Contribution) and Section 10 (Representations and Indemnities to Survive
Delivery), Section 13 (Partial Unenforceability) and Section 14 (Governing Law
Provisions) shall at all times be effective and shall survive such termination.

             SECTION 5. PAYMENT OF EXPENSES. The Company agrees to pay all
costs, fees and expenses incurred in connection with the performance of its
obligations hereunder and in connection with the transactions contemplated
hereby, including without limitation (a) all expenses incident to the issuance
and delivery of the Shares (including all printing and engraving costs), (b) all
fees and expenses of the registrar and transfer agent of the Common Shares, (c)
all issue, transfer and other stamp taxes in connection with the issuance and
sale of the Shares to the Underwriters, (d) all fees and expenses of the
Company's counsel, independent public or certified public accountants and other
advisors, (e) all costs and expenses incurred in connection with the
preparation, printing, filing, shipping and distribution of the Registration
Statement (including financial statements, exhibits, schedules, consents and
certificates of experts), each preliminary prospectus and the Prospectus, and
all amendments and supplements thereto, and this Agreement, (f) all filing fees,
attorneys' fees and expenses incurred by the Company or the Underwriters in
connection with qualifying or registering (or obtaining exemptions from the
qualification or registration of) all or any part of the Shares for offer and
sale under the state securities or blue sky laws or the provincial securities
laws of Canada or any other country, and, if requested by the Representatives,
preparing and printing a "Blue Sky Survey", an "International Blue Sky Survey"
or other memorandum, and any supplements thereto, advising the Underwriters of
such qualifications, registrations and exemptions provided that such fees and
expenses do not exceed $10,000, (g) the filing fees incident to, and the
reasonable fees and expenses of counsel for the Underwriters in connection with,
any NASD review and approval of the Underwriters' participation in the offering
and distribution of the Shares, (h) the fees and expenses associated with
including the Shares on


                                      18.
   19



the Nasdaq National Market, (i) all costs and expenses incident to the travel
and accommodation of the Company's employees on any "roadshow" and (j) all other
fees, costs and expenses referred to in Item 14 of Part II of the Registration
Statement. Except as expressly provided in this Section 5, Section 6 and Section
7 hereof, the Underwriters shall pay their own expenses, including the fees and
disbursements of their counsel.

     SECTION 6. REIMBURSEMENT OF UNDERWRITERS' EXPENSES. If this Agreement is
terminated by the Representatives pursuant to Section 4, Section 8 or Section 9,
or if the sale to the Underwriters of the Shares on the First Closing Date is
not consummated because of any refusal, inability or failure on the part of the
Company to perform any agreement herein or to comply with any provision hereof,
the Company agrees to reimburse the Representatives and the other Underwriters
(or such Underwriters as have terminated this Agreement with respect to
themselves), severally, upon demand for all reasonable out-of-pocket expenses
(with reasonable supporting documentation) that shall have been reasonably
incurred by the Representatives and the Underwriters in connection with the
proposed purchase and the offering and sale of the Shares, including but not
limited to fees and disbursements of counsel, printing expenses, travel and
accommodation expenses, postage, facsimile and telephone charges.

     SECTION 7. INDEMNIFICATION AND CONTRIBUTION.

     (a) Indemnification of the Underwriters. The Company agrees to indemnify
and hold harmless each Underwriter, its officers and employees, and each person,
if any, who controls any Underwriter within the meaning of the Securities Act
and the Exchange Act against any loss, claim, damage, liability or expense, as
incurred, to which such Underwriter or such controlling person may become
subject, under the Securities Act, the Exchange Act or other federal or state
statutory law or regulation, or at common law or otherwise (including in
settlement of any litigation, if such settlement is effected with the written
consent of the Company, which consent shall not be unreasonably withheld),
insofar as such loss, claim, damage, liability or expense (or actions in respect
thereof as contemplated below) arises out of or is based (i) upon any untrue
statement or alleged untrue statement of a material fact contained in the
Registration Statement, or any amendment thereto, including any information
deemed to be a part thereof pursuant to Rule 430A under the Securities Act, or
the omission or alleged omission therefrom of a material fact required to be
stated therein or necessary to make the statements therein not misleading; or
(ii) upon any untrue statement or alleged untrue statement of a material fact
contained in any preliminary prospectus or the Prospectus (or any amendment or
supplement thereto), or the omission or alleged omission therefrom of a material
fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading; or (iii) in whole or
in part upon any inaccuracy in the representations and warranties of the Company
contained herein; or (iv) in whole or in part upon any failure of the Company to
perform its obligations hereunder or under law; or (v) any untrue statement or
alleged untrue statement of any material fact contained in any audio or visual
materials provided by the Company or based upon written information furnished by
or on behalf of the Company including, without limitation, slides, videos, films
or tape recordings, used in connection with the marketing of the Shares or (vi)
any act or failure to act or any alleged act or failure to act by any
Underwriter in connection with, or relating in any manner to, the Shares or the
offering contemplated hereby, and which is included as part of or referred to in
any loss, claim, damage, liability or action arising out of or based upon any
matter covered by clause (i), (ii), (iii), (iv) or (v) above, provided that the
Company shall not be liable under this clause (vi) to the extent that a court of
competent jurisdiction shall have determined by a final judgment that such loss,
claim, damage, liability or action resulted directly from any such acts or
failures to act

                                      19.
   20


undertaken or omitted to be taken by such Underwriter through its bad faith or
willful misconduct; and to reimburse each Underwriter and each such controlling
person for any and all expenses (including the reasonable fees and disbursements
of counsel for such Underwriters) as such expenses are reasonably incurred by
such Underwriter or such controlling person in connection with investigating,
defending, settling, compromising or paying any such loss, claim, damage,
liability, expense or action; provided, however, that the foregoing indemnity
agreement shall not apply to any loss, claim, damage, liability or expense to
the extent, but only to the extent, arising out of or based upon any untrue
statement or alleged untrue statement or omission or alleged omission made in
reliance upon and in conformity with written information furnished to the
Company by the Representatives expressly for use in the Registration Statement,
any preliminary prospectus or the Prospectus (or any amendment or supplement
thereto); and provided, further, that with respect to any preliminary
prospectus, the foregoing indemnity agreement shall not inure to the benefit of
any Underwriter from whom the person asserting any loss, claim, damage,
liability or expense purchase Shares, or any person controlling such
Underwriter, if copies of the Prospectus were timely delivered to the
Underwriter pursuant to Section 2 and a copy of the Prospectus (as then amended
or supplemented if the Company shall have furnished any amendments or
supplements thereto) was not sent or given by or on behalf of such Underwriter
to such person, if required by law so to have been delivered and if the
Prospectus (as so amended or supplemented) would have cured the defect giving
rise to such loss, claim, damage, liability or expense. The indemnity agreement
set forth in this Section 7(a) shall be in addition to any liabilities that the
Company may otherwise have.

     (b) Indemnification of the Company, its Directors and Officers. Each
Underwriter agrees, severally and not jointly, to indemnify and hold harmless
the Company, each of its directors, each of its officers who signed the
Registration Statement and each person, if any, who controls the Company within
the meaning of the Securities Act or the Exchange Act, against any loss, claim,
damage, liability or expense, as incurred, to which the Company, or any such
director, officer or controlling person may become subject, under the Securities
Act, the Exchange Act, or other federal or state statutory law or regulation, or
at common law or otherwise (including in settlement of any litigation, if such
settlement is effected with the written consent of such Underwriter), insofar as
such loss, claim, damage, liability or expense (or actions in respect thereof as
contemplated below) arises out of or is based upon any untrue or alleged untrue
statement of a material fact contained in the Registration Statement, any
preliminary prospectus or the Prospectus (or any amendment or supplement
thereto), or arises out of or is based upon the omission or alleged omission to
state therein a material fact required to be stated therein or necessary to make
the statements therein not misleading, in each case to the extent, but only to
the extent, that such untrue statement or alleged untrue statement or omission
or alleged omission was made in the Registration Statement, any preliminary
prospectus or the Prospectus (or any amendment or supplement thereto), in
reliance upon and in conformity with written information furnished to the
Company by the Representatives expressly for use therein; and to reimburse the
Company, or any such director, officer or controlling person for any legal and
other expense reasonably incurred by the Company, or any such director, officer
or controlling person in connection with investigating, defending, settling,
compromising or paying any such loss, claim, damage, liability, expense or
action. The indemnity agreement set forth in this Section 7(b) shall be in
addition to any liabilities that each Underwriter may otherwise have.

     (c) Information Provided by the Underwriters. The Company and each person,
if any, who controls the Company within the meaning of the Securities Act or the
Exchange Act, hereby acknowledges that the only information that the
Underwriters have furnished to the


                                      20.
   21


Company expressly for use in the Registration Statement, any preliminary
prospectus or the Prospectus (or any amendment or supplement thereto) are the
statements set forth in the table in the first paragraph and the second (2nd),
twelfth (12th), thirteenth (13th), fourteenth (14th) and fifteenth (15th)
paragraphs under the caption "Underwriting" in the Prospectus; and the
Underwriters confirm that such statements are correct.

     (d) Notifications and Other Indemnification Procedures. Promptly after
receipt by an indemnified party under this Section 7 of notice of the
commencement of any action, such indemnified party will, if a claim in respect
thereof is to be made against an indemnifying party under this Section 7, notify
the indemnifying party in writing of the commencement thereof, but the omission
so to notify the indemnifying party will not relieve it from any liability which
it may have to any indemnified party for contribution or otherwise under the
indemnity agreement contained in this Section 7 or otherwise to the extent it is
not prejudiced as a proximate result of such failure. In case any such action is
brought against any indemnified party and such indemnified party seeks or
intends to seek indemnity from an indemnifying party, the indemnifying party
will be entitled to participate in, and, to the extent that it shall elect,
jointly with all other indemnifying parties similarly notified, by written
notice delivered to the indemnified party promptly after receiving the aforesaid
notice from such indemnified party, to assume the defense thereof with counsel
reasonably satisfactory to such indemnified party; provided, however, if the
defendants in any such action include both the indemnified party and the
indemnifying party and the indemnified party shall have reasonably concluded
that a conflict may arise between the positions of the indemnifying party and
the indemnified party in conducting the defense of any such action or that there
may be legal defenses available to it and/or other indemnified parties which are
different from or additional to those available to the indemnifying party, the
indemnified party or parties shall have the right to select separate counsel to
assume such legal defenses and to otherwise participate in the defense of such
action on behalf of such indemnified party or parties. Upon receipt of notice
from the indemnifying party to such indemnified party of such indemnifying
party's election so to assume the defense of such action and approval by the
indemnified party of counsel, the indemnifying party will not be liable to such
indemnified party under this Section 7 for any legal or other expenses
subsequently incurred by such indemnified party in connection with the defense
thereof unless (i) the indemnified party shall have employed separate counsel in
accordance with the proviso to the next preceding sentence (it being understood,
however, that the indemnifying party shall not be liable for the reasonable
expenses of more than one separate counsel (together with local counsel),
approved by the indemnifying party (Robertson Stephens in the case of Section
7(b) and Section 8), representing the indemnified parties who are parties to
such action), (ii) the indemnifying party shall not have employed counsel
satisfactory to the indemnified party to represent the indemnified party within
a reasonable time after notice of commencement of the action or (iii) the
indemnifying party has authorized the employment of counsel for the indemnified
party at the reasonable expense of the indemnifying party, in each of which
cases the fees and expenses of counsel shall be at the expense of the
indemnifying party.

     (e) Settlements. The indemnifying party under this Section 7 shall not be
liable for any settlement of any proceeding effected without its written
consent, which consent shall not be unreasonably withheld, but if settled with
such consent or if there be a final judgment for the plaintiff, the indemnifying
party agrees to indemnify the indemnified party against any loss, claim, damage,
liability or expense by reason of such settlement or judgment. Notwithstanding
the foregoing sentence, if at any time an indemnified party shall have requested
an indemnifying party to reimburse the indemnified party for fees and expenses
of counsel as contemplated by Section 7(d) hereof, the indemnifying party agrees
that it shall be liable for any settlement of any

                                      21.
   22


proceeding effected without its written consent if (i) such settlement is
entered into more than 60 days after receipt by such indemnifying party of the
aforesaid request and (ii) such indemnifying party shall not have reimbursed the
indemnified party in accordance with such request prior to the date of such
settlement. No indemnifying party shall, without the prior written consent of
the indemnified party, effect any settlement, compromise or consent to the entry
of judgment in any pending or threatened action, suit or proceeding in respect
of which any indemnified party is or could have been a party and indemnity was
or could have been sought hereunder by such indemnified party, unless such
settlement, compromise or consent includes (i) an unconditional release of such
indemnified party from all liability on claims that are the subject matter of
such action, suit or proceeding and (ii) does not include a statement as to or
an admission of fault, culpability or a failure to act by or on behalf of any
indemnified party.

     (f) Contribution. If the indemnification provided for in this Section 7 is
unavailable to or insufficient to hold harmless an indemnified party under
Section 7(a) or (b) above in respect of any losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) then each
indemnifying party shall contribute to the aggregate amount paid or payable by
such indemnified party in such proportion as is appropriate to reflect the
relative benefits received by such party on the one hand and the Underwriters on
the other from the offering of the Shares. If, however, the allocation provided
by the immediately preceding sentence is not permitted by applicable law then
each indemnifying party shall contribute to such amount paid or payable by such
indemnified party in such proportion as is appropriate to reflect not only such
relative benefits but also the relative fault of such party on the one hand and
the Underwriters on the other in connection with the statements or omissions
which resulted in such losses, claims, damages or liabilities, (or actions or
proceedings in respect thereof), as well as any other relevant equitable
considerations. The relative fault shall be determined by reference to, among
other things, whether the untrue or alleged untrue statement of a material fact
or the omission or alleged omission to state a material fact relates to
information supplied by the Company on the one hand or the Underwriters on the
other and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission.

     The Company and the Underwriters agree that it would not be just and
equitable if contributions pursuant to this Section 7(f) were determined by pro
rata allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation which does not take account of the
equitable considerations referred to above in this Section 7(f). The amount paid
or payable by an indemnified party as a result of the losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) referred to above in
this Section 7(f) shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any such action or claim. Notwithstanding the provisions of this
subsection (f), (i) no Underwriter shall be required to contribute any amount in
excess of the underwriting discounts and commissions applicable to the Shares
purchased by such Underwriter and (ii) no person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation. The Underwriters' obligations in this Section 7(f)
to contribute are several in proportion to their respective underwriting
obligations and not joint.

     (g) Timing of Any Payments of Indemnification. Any losses, claims, damages,
liabilities or expenses for which an indemnified party is entitled to
indemnification or contribution under this Section 7 shall be paid by the
indemnifying party to the indemnified party as such losses, claims, damages,
liabilities or expenses are incurred, but in all cases, no later than forty-five
(45) days of invoice (with reasonable supporting documentation) to the
indemnifying party.


                                      22.
   23


     (h) Survival. The indemnity and contribution agreements contained in this
Section 7 and the representation and warranties set forth in this Agreement
shall remain operative and in full force and effect, regardless of (i) any
investigation made by or on behalf of any Underwriter or any person controlling
any Underwriter, the Company, its directors or officers or any persons
controlling the Company, (ii) acceptance of any Shares and payment therefor
hereunder and (iii) any termination of this Agreement. A successor to any
Underwriter, or to the Company, its directors or officers, or any person
controlling the Company, shall be entitled to the benefits of the indemnity,
contribution and reimbursement agreements contained in this Section 7.

     (i) Acknowledgements of Parties. The parties to this Agreement hereby
acknowledge that they are sophisticated business persons who were represented by
counsel during the negotiations regarding the provisions hereof including,
without limitation, the provisions of this Section 7, and are fully informed
regarding said provisions. They further acknowledge that the provisions of this
Section 7 fairly allocate the risks in light of the ability of the parties to
investigate the Company and its business in order to assure that adequate
disclosure is made in the Registration Statement and Prospectus as required by
the Securities Act and the Exchange Act.

     SECTION 8. DEFAULT OF ONE OR MORE OF THE SEVERAL UNDERWRITERS. If, on the
First Closing Date or the Second Closing Date, as the case may be, any one or
more of the several Underwriters shall fail or refuse to purchase Shares that it
or they have agreed to purchase hereunder on such date, and the aggregate number
of Shares that such defaulting Underwriter or Underwriters agreed but failed or
refused to purchase does not exceed 10% of the aggregate number of the Shares to
be purchased on such date, the other Underwriters shall be obligated, severally,
in the proportions that the number of Firm Shares set forth opposite their
respective names on Schedule A bears to the aggregate number of Firm Shares set
forth opposite the names of all such non-defaulting Underwriters, or in such
other proportions as may be specified by the Representatives with the consent of
the non-defaulting Underwriters, to purchase the Shares that such defaulting
Underwriter or Underwriters agreed but failed or refused to purchase on such
date. If, on the First Closing Date or the Second Closing Date, as the case may
be, any one or more of the Underwriters shall fail or refuse to purchase Shares
and the aggregate number of Shares with respect to which such default occurs
exceeds 10% of the aggregate number of Shares to be purchased on such date, and
arrangements satisfactory to the Representatives and the Company for the
purchase of such Shares are not made within forty-eight (48) hours after such
default, this Agreement shall terminate without liability of any party to any
other party except that the provisions of Section 5, Section 6, Section 7,
Section 10, Section 13 and Section 14 shall at all times be effective and shall
survive such termination. In any such case either the Representatives or the
Company shall have the right to postpone the First Closing Date or the Second
Closing Date, as the case may be, but in no event for longer than seven (7) days
in order that the required changes, if any, to the Registration Statement and
the Prospectus or any other documents or arrangements may be effected.

     As used in this Agreement, the term "Underwriter" shall be deemed to
include any person substituted for a defaulting Underwriter under this Section
8. Any action taken under this Section 8 shall not relieve any defaulting
Underwriter from liability in respect of any default of such Underwriter under
this Agreement.

     SECTION 9. TERMINATION OF THIS AGREEMENT. This Agreement may be terminated
by the Representatives by notice given to the Company if (a) at any time after
the execution and delivery of this Agreement and prior to the First Closing Date
(i) trading or quotation in any of the Company's securities shall have been
suspended or limited by the Commission or by The


                                      23.
   24



Nasdaq Stock Market, Inc., or trading in securities generally on either the
Nasdaq National Market or the New York Stock Exchange shall have been suspended
or limited, or minimum or maximum prices shall have been generally established
on any national stock exchange or automated quotation system by the Commission
or the NASD; (ii) a general banking moratorium shall have been declared by any
of federal, New York or California authorities; (iii) there shall have occurred
any outbreak or escalation of national or international hostilities or any
crisis or calamity, or any change in the United States or international
financial markets, or any substantial change or development involving a
prospective change in United States' or international political, financial or
economic conditions, as in the judgment of the Representatives is material and
adverse and makes it impracticable or inadvisable to market the Shares in the
manner and on the terms contemplated in the Prospectus or to enforce contracts
for the sale of securities; (iv) in the reasonable judgment of the
Representatives there shall have occurred any Material Adverse Change; or (v)
the Company shall have sustained a loss by strike, fire, flood, earthquake,
accident or other calamity of such character as in the judgment of the
Representatives may interfere materially with the conduct of the business and
operations of the Company regardless of whether or not such loss shall have been
insured or (b) in the case of any of the events specified 9(a)(i)-(v), such
event singly or together with any other event, makes it, in Robertson Stephens'
judgement, impracticable or inadvisable to market the Shares in the manner and
on the terms contemplated in the Prospectus. Any termination pursuant to this
Section 9 shall be without liability on the part of (x) the Company to any
Underwriter, except that the Company shall be obligated to reimburse the
expenses of the Representatives and the Underwriters pursuant to Sections 5 and
6 hereof, (y) any Underwriter to the Company or any person controlling the
Company or (z) of any party hereto to any other party except that the provisions
of Section 7 shall at all times be effective and shall survive such termination.

     SECTION 10. REPRESENTATIONS AND INDEMNITIES TO SURVIVE DELIVERY. The
respective indemnities, agreements, representations, warranties and other
statements of the Company or any person controlling the company, of its officers
and of the several Underwriters set forth in or made pursuant to this Agreement
will remain in full force and effect, regardless of any investigation made by or
on behalf of any Underwriter or the Company or any of its or their partners,
officers or directors or any controlling person, as the case may be, and will
survive delivery of and payment for the Shares sold hereunder and any
termination of this Agreement.

     SECTION 11. NOTICES. All communications hereunder shall be in writing and
shall be mailed, hand delivered or telecopied and confirmed to the parties
hereto as follows:

If to the Representatives:

         ROBERTSON STEPHENS, INC.
         555 California Street
         San Francisco, California  94104
         Facsimile:  (415) 676-2675
         Attention:  Deputy General Counsel

If to the Company:

         PLEXUS CORP.
         55 Jewelers Park Drive
         Neenah, Wisconsin  54957
         Facsimile:  (920) 751-3234
         Attention:  Chief Financial Officer


                                      24.
   25

With a copy to:

         QUARLES & BRADY LLP
         411 East Wisconsin Avenue
         Milwaukee, Wisconsin  53202
         Facsimile:  (414) 271-3552
         Attention:  Conrad G. Goodkind, Esq.

Any party hereto may change the address for receipt of communications by giving
written notice to the others.

         SECTION 12. SUCCESSORS. This Agreement will inure to the benefit of and
be binding upon the parties hereto, including any substitute Underwriters
pursuant to Section 8 hereof, and to the benefit of the employees, officers and
directors and controlling persons referred to in Section 7, and to their
respective successors, and no other person will have any right or obligation
hereunder. The term "successors" shall not include any purchaser of the Shares
as such from any of the Underwriters merely by reason of such purchase.

         SECTION 13. PARTIAL UNENFORCEABILITY. The invalidity or
unenforceability of any Section, paragraph or provision of this Agreement shall
not affect the validity or enforceability of any other Section, paragraph or
provision hereof. If any Section, paragraph or provision of this Agreement is
for any reason determined to be invalid or unenforceable, there shall be deemed
to be made such minor changes (and only such minor changes) as are necessary to
make it valid and enforceable.

         SECTION 14. GOVERNING LAW PROVISIONS.

         (a) Governing Law. This agreement shall be governed by and construed in
accordance with the internal laws of the State of New York applicable to
agreements made and to be performed in such state.

         (b) Consent to Jurisdiction. Any legal suit, action or proceeding
arising out of or based upon this Agreement or the transactions contemplated
hereby may be instituted in the federal courts of the United States of America
located in the City and County of San Francisco or the courts of the State of
California in each case located in the City and County of San Francisco
(collectively, the "Specified Courts"), and each party irrevocably submits to
the personal jurisdiction (except for proceedings instituted in regard to the
enforcement of a judgment of any such court, as to which such jurisdiction is
non-exclusive) of such courts in any such suit, action or proceeding. Service of
any process, summons, notice or document by mail to such party's address set
forth above shall be effective service of process for any suit, action or other
proceeding brought in any such court. The parties irrevocably and
unconditionally waive any objection to the laying of venue of any suit, action
or other proceeding in the Specified Courts and irrevocably and unconditionally
waive and agree not to plead or claim in any such court that any such suit,
action or other proceeding brought in any such court has been brought in an
inconvenient forum. Each party irrevocably appoints CT Corporation System, which
currently maintains a San Francisco office at 49 Stevenson Street, San
Francisco, California 94105, United States of America, as its agent to receive
service of process or other legal summons for purposes of any such suit, action
or proceeding that may be instituted in any state or federal court in the City
and County of San Francisco.



                                      25.
   26

         SECTION 15. GENERAL PROVISIONS. This Agreement constitutes the entire
agreement of the parties to this Agreement and supersedes all prior written or
oral and all contemporaneous oral agreements, understandings and negotiations
with respect to the subject matter hereof. This Agreement may be executed in two
or more counterparts, each one of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument.
This Agreement may not be amended or modified unless in writing by all of the
parties hereto, and no condition herein (express or implied) may be waived
unless waived in writing by each party whom the condition is meant to benefit.
Section headings herein are for the convenience of the parties only and shall
not affect the construction or interpretation of this Agreement.


                            [signature page follows]







                                      26.
   27


         If the foregoing is in accordance with your understanding of our
agreement, please sign and return to Robertson Stephens, Inc. the enclosed
copies hereof, whereupon this instrument, along with all counterparts hereof,
shall become a binding agreement in accordance with its terms.

                            Very truly yours,


                            PLEXUS CORP.




                            By:
                               -------------------------------------------------
                               Senior Vice President and Chief Financial Officer


         The foregoing Underwriting Agreement is hereby confirmed and accepted
by the Representatives as of the date first above written.

ROBERTSON STEPHENS, INC.
SG COWEN SECURITIES CORPORATION
THOMAS WEISEL PARTNERS LLC
ROBERT W. BAIRD & CO. INCORPORATED

On their behalf and on behalf of each of the several underwriters named in
Schedule A hereto.

BY ROBERTSON STEPHENS, INC.



By:
   ------------------------








   28


                                   SCHEDULE A





                                                                                         NUMBER OF FIRM
                               UNDERWRITERS                                           SHARES TO BE PURCHASED
                               ------------                                           ----------------------
                                                                                  
ROBERTSON STEPHENS, INC..............................................................          1,059,250
SG COWEN SECURITIES CORPORATION......................................................            529,625
THOMAS WEISEL PARTNERS LLC...........................................................            529,625
ROBERT W. BAIRD & CO. INCORPORATED...................................................            111,500
CHASE SECURITIES INC.................................................................             70,000
CREDIT SUISSE FIRST BOSTON CORPORATION...............................................             70,000
DAIN RAUSCHER INCORPORATED...........................................................             70,000
A.G. EDWARDS & SONS, INC.............................................................             70,000
FIRST UNION SECURITIES, INC..........................................................             70,000
GOLDMAN, SACHS & CO..................................................................             70,000
PRUDENTIAL SECURITIES INCORPORATED...................................................             70,000
E*OFFERING...........................................................................             40,000
FIDELITY CAPITAL MARKETS, A DIVISION OF NATIONAL
    FINANCIAL SERVICES CORPORATION...................................................             40,000
C.L. KING & ASSOCIATES, INC..........................................................             40,000
MCDONALD INVESTMENTS INC., A KEYCORP COMPANY.........................................             40,000
NEEDHAM & COMPANY, INC...............................................................             40,000
RAYMOND JAMES & ASSOCIATES, INC......................................................             40,000
STEPHENS INC.........................................................................             40,000
                                                                                         ----------------
           Total.....................................................................          3,000,000
                                                                                         ================





                                      S-A
   29


                                    EXHIBIT A

                           SUBSIDIARIES OF THE COMPANY




                                                                                                          JURISDICTION OF
    SUBSIDIARY                                         PARENT COMPANY                                      ORGANIZATION
    ----------                                         --------------                                      ------------
                                                                                                   
*   Electronic Assembly Corp.                          Plexus Corp.                                          Wisconsin
    Technology Group, Inc.                             Plexus Corp.                                          Wisconsin
    Plexus International Services, Inc.                Plexus Corp.                                           Nevada
    Agility, Inc.                                      Plexus Corp.                                        Massachusetts
*   SeaMED Corporation                                 Plexus Corp.                                         Washington
    Plexus ABS, Inc.                                   Plexus Corp.                                           Nevada
    Plexus QS, LLC                                     Electronic Assembly Corp.                             Delaware
*   Plexus Intl. Sales & Logistics, LLC                Electric Assembly Corp.                               Delaware
    Electronica Las Torres, S.A. de C.V.               Plexus Intl. Sales & Logistics, LLC                    Mexico
    Servicios Administrativos Las Torres,              Plexus Intl. Sales & Logistics, LLC                    Mexico
    S.A. de C.V.
    Plexus Electronica, S. de R.L. de C.V.             Electronica Las Torres, S.A. de C.V.                   Mexico
    Plexus de Servicios Management,                    Electronica Las Torres, S.A. de C.V.                   Mexico
    S. de R.L. de C.V.
    Plexus Corp. Limited                               Plexus International Services, Inc.                United Kingdom
    Keltek (Holdings) Limited                          Plexus Corp. Limited                               United Kingdom
    Keltek Electronics Limited                         Keltek (Holdings) Limited                          United Kingdom
    Keltek Electronics Limited (Maldor)                Keltek (Holdings) Limited                          United Kingdom


- -------------------
* "Significant Subsidiary" for purposes of Exhibit C to this Agreement.




                                      A-1
   30


                                    EXHIBIT B

                                LOCK-UP AGREEMENT

Robertson Stephens, Inc.
SG Cowen Securities Corporation
Thomas Weisel Partners LLC
Robert W. Baird & Co. Incorporated
         As Representatives of the Several Underwriters
c/o Robertson Stephens, Inc.
555 California Street, Suite 2600
San Francisco, California 94104

RE:  Plexus Corp. (the "Company")

Ladies & Gentlemen:

         The undersigned is an owner of record or beneficially of certain shares
of Common Stock of the Company ("Common Stock") or securities convertible into
or exchangeable or exercisable for Common Stock. The Company proposes to carry
out a public offering of Common Stock (the "Offering") for which you will act as
the representatives (the "Representatives") of the underwriters. The undersigned
recognizes that the Offering will be of benefit to the undersigned and will
benefit the Company by, among other things, raising additional capital for its
operations. The undersigned acknowledges that you and the other underwriters are
relying on the representations and agreements of the undersigned contained in
this letter in carrying out the Offering and in entering into underwriting
arrangements with the Company with respect to the Offering.

         In consideration of the foregoing, the undersigned hereby agrees that
the undersigned will not offer to sell, contract to sell, or otherwise sell,
dispose of, loan, pledge or grant any rights with respect to (collectively, a
"Disposition") any shares of Common Stock, any options or warrants to purchase
any shares of Common Stock or any securities convertible into or exchangeable
for shares of Common Stock (collectively, "Securities") now owned or hereafter
acquired directly by such person or with respect to which such person has or
hereafter acquires the power of disposition, otherwise than (i) as a bona fide
gift or gifts, provided the donee or donees thereof agree in writing to be bound
by this restriction, (ii) as a distribution to partners or shareholders of such
person, provided that the distributees thereof agree in writing to be bound by
the terms of this restriction, (iii) with respect to sales or purchases of
Common Stock acquired on the open market or (iv) with the prior written consent
of Robertson Stephens, Inc. The foregoing restrictions will terminate after the
close of trading of the Common Stock on the 90th day of (and including) the day
the Common Stock distributed in the Offering commenced trading on the Nasdaq
National Market (the "Lock-Up" Period). The foregoing restriction has been
expressly agreed to preclude the holder of the Securities from engaging in any
hedging or other transaction which is designed to or reasonably expected to lead
to or result in a Disposition of Securities during the Lock-up Period, even if
such Securities would be disposed of by someone other than such holder. Such
prohibited hedging or other transactions would include, without limitation, any
short sale (whether or not against the box) or any purchase, sale or grant of
any right (including, without limitation, any put or call option) with respect
to any Securities or with respect to any security (other than a broad-based
market basket or index) that includes, relates to or derives any significant
part of its value from Securities. The undersigned also agrees and consents to
the entry of stop transfer instructions with the Company's transfer



                                       B-1
   31

agent and registrar against the transfer of shares of Common Stock or Securities
held by the undersigned except in compliance with the foregoing restrictions.

         This agreement is irrevocable and will be binding on the undersigned
and the respective successors, heirs, personal representatives, and assigns of
the undersigned. In the event the Offering has not occurred on or before January
31, 2001, this Lock-Up Agreement shall be of no further force or effect.

                          Dated October   , 2000

                          ------------------------------------------------------
                                                          Printed Name of Holder
                          By:
                             ---------------------------------------------------
                                                                       Signature

                          ------------------------------------------------------
                                                  Printed Name of Person Signing
                          (and indicate capacity of person signing if signing as
                                  custodian, trustee, or on behalf of an entity)







                                      B-2
   32


                                    EXHIBIT C

             MATTERS TO BE COVERED IN THE OPINION OF COMPANY COUNSEL

         (i)     The Company has been duly incorporated and the Company and each
         Significant Subsidiary (as that term is defined in Exhibit A to this
         Agreement) of the Company are validly existing as corporations in good
         standing or active status, as the case may be, under the laws of their
         respective jurisdictions of incorporation.

         (ii)    The Company and each Significant Subsidiary have the corporate
         power and authority to own, lease and operate their respective
         properties and to conduct their respective businesses as described in
         the Prospectus.

         (iii)   Each of the Company and each Significant Subsidiary is duly
         qualified to do business as a foreign corporation and in good standing
         or active status, as the case may be, in each jurisdiction, if any, in
         which the ownership or leasing of its properties or the conduct of its
         business requires such qualification, except where the failure to be so
         qualified or be in good standing would not have a Material Adverse
         Effect. To such counsel's knowledge, the Company does not own or
         control, directly or indirectly, any corporation, association or other
         entity other than the subsidiaries listed in Exhibit A to this
         Agreement.

         (iv)    The authorized capital stock of the Company is as set forth in
         the Prospectus under the caption "Capitalization" as of the dates
         stated therein. The issued and outstanding shares of capital stock of
         the Company outstanding prior to the issuance of the [Firm/Option]
         Shares have been duly authorized and validly issued and, to such
         counsel's knowledge, will not have been issued in violation of or
         subject to any preemptive right arising under the Company's certificate
         of incorporation or the Wisconsin Business Corporation Law or any
         co-sale right, right of first refusal or other similar right.

         (v)     All issued and outstanding shares of capital stock of each
         Significant Subsidiary of the Company have been duly authorized and
         validly issued and, to such counsel's knowledge, have not been issued
         in violation of or subject to any preemptive right arising under the
         articles of incorporation of the Company or such Significant Subsidiary
         or the Wisconsin Business Corporation Law or any co-sale right, right
         of first refusal or other similar right and are owned by the Company
         free and clear of any pledge, lien, security interest, encumbrance,
         claim or equitable interest.

         (vi)    The Firm Shares or the Option Shares, as the case may be, to be
         issued by the Company pursuant to the terms of this Agreement have been
         duly authorized and, upon issuance and delivery against payment
         therefor in accordance with the terms hereof, will be duly and validly
         issued and fully paid and nonassessable, except as set forth in Section
         180.0622(2)(b) of the Wisconsin Business Corporation Law, and, to such
         counsel's knowledge will not have been issued in violation of or
         subject to any preemptive right, co-sale right, right of first refusal
         or other similar right.

         (vii)   The Company has the corporate power and authority to enter into
         this Agreement and to issue, sell and deliver to the Underwriters the
         Shares to be issued and sold by it hereunder.



                                      C-1
   33

         (viii) This Agreement has been duly authorized by all necessary
         corporate action on the part of the Company and has been duly executed
         and delivered by the Company and, assuming due authorization, execution
         and delivery by you, is a valid and binding agreement of the Company,
         enforceable in accordance with its terms, except as rights to
         indemnification hereunder may be limited by applicable law and except
         as enforceability may be limited by bankruptcy, insolvency,
         reorganization, moratorium or similar laws relating to or affecting
         creditors' rights generally or by general equitable principles (whether
         relief is sought in a proceeding at law or in equity).

         (ix)   The Registration Statement has become effective under the
         Securities Act and, to such counsel's knowledge, no stop order
         suspending the effectiveness of the Registration Statement has been
         issued and no proceedings for that purpose have been instituted or are
         pending or threatened under the Securities Act.

         (x)    The Form 8-A registration statements relating to the Common
         Shares complied as to form in all material respects with the
         requirements of the Exchange Act; the Form 8-A registration statements
         have become effective under the Exchange Act; and the [Firm/Option]
         Shares have been validly registered under the Securities Act and the
         Exchange Act.

         (xi)   The Registration Statement and the Prospectus, and each
         amendment or supplement thereto (other than the financial statements
         (including supporting schedules) and financial data derived therefrom
         as to which such counsel need express no opinion), as of the effective
         date of the Registration Statement, complied as to form in all material
         respects with the requirements of the Securities Act; and each of the
         documents incorporated by reference or deemed to be incorporated by
         reference into the Registration Statement and the Prospectus pursuant
         to the Securities Act or the Exchange Act (each, an "Incorporated
         Document") (other than the financial statements (including supporting
         schedules) and the financial data derived therefrom as to which such
         counsel need express no opinion) complied when filed pursuant to the
         Exchange Act as to form in all material respects with the requirements
         of the Securities Act and the Exchange Act.

         (xii)  The information in the Prospectus under the caption "Description
         of Capital Stock", to the extent that it constitutes matters of law or
         legal conclusions, has been reviewed by such counsel and is a fair
         summary of such matters and conclusions; and the forms of certificates
         evidencing the Common Shares and filed as exhibits to the Registration
         Statement comply with Wisconsin law.

         (xiii) The statements made in the Prospectus under the caption "United
         States Federal Income Tax Consequences to Non-U.S. Holders", to the
         extent they constitute matters of law or legal conclusions, are
         accurate in all material respects.

         (xiv)  To such counsel's knowledge, there are no agreements, contracts,
         leases or documents to which the Company is a party of a character
         required to be filed with the Commission pursuant to Regulation S-K
         under the Securities Act that have not been so filed as required.

         (xv)   The performance of this Agreement and the consummation of the
         transactions herein contemplated (other than performance of the
         Company's indemnification obligations hereunder, concerning which no
         opinion need be expressed) will not



                                      C-2
   34

         (a) result in any violation of the Company's articles or bylaws or (b)
         to such counsel's knowledge, result in a material breach or violation
         of any of the terms and provisions of, or constitute a default under,
         any bond, debenture, note or other evidence of indebtedness, or any
         lease, contract, indenture, mortgage, deed of trust, loan agreement,
         joint venture or other material agreement or instrument known to such
         counsel to which the Company or any Significant Subsidiary is a party
         or by which its properties are bound, or any applicable statute, rule
         or regulation known to such counsel or, to such counsel's knowledge,
         any order, writ or decree of any court, government or governmental
         agency or body having jurisdiction over the Company or any of its
         subsidiaries, or over any of their respective properties or operations.

         (xvi)   No consent, approval, authorization or order of or
         qualification with any court, government or governmental agency or body
         having jurisdiction over the Company or any of its subsidiaries, or
         over any of their respective properties or operations, is necessary in
         connection with the consummation by the Company of the transactions
         herein contemplated, except (a) such as have been obtained under the
         Securities Act, (b) such as may be required under state or other
         securities or Blue Sky laws in connection with the purchase and the
         distribution of the Shares by the Underwriters and (c) such as may be
         required by the NASD.

         (xvii)  To such counsel's knowledge, neither the Company nor any of its
         subsidiaries is presently (a) in material violation of its respective
         articles or bylaws or (b) in material breach of any order, writ or
         decree of any court or governmental agency or body having jurisdiction
         over the Company or any of its subsidiaries, or over any of their
         respective properties or operations.

         (xviii) To such counsel's knowledge, except as set forth in the
         Registration Statement and Prospectus, no holders of Common Shares or
         other securities of the Company have registration rights with respect
         to securities of the Company and, except as set forth in the
         Registration Statement and Prospectus, all holders of securities of the
         Company having rights known to such counsel to registration of such
         Common Shares or other securities, because of the filing of the
         Registration Statement by the Company have, with respect to the
         offering contemplated thereby, waived such rights or such rights have
         expired by reason of lapse of time following notification of the
         Company's intent to file the Registration Statement or have included
         securities in the Registration Statement pursuant to the exercise of
         and in full satisfaction of such rights.

         (xix)   The Company is not and, after giving effect to the offering and
         the sale of the Shares and the application of the proceeds thereof as
         described in the Prospectus, will not be, an "investment company" as
         such term is defined in the Investment Company Act of 1940, as amended.

         (xx)    Each document filed pursuant to the Exchange Act (other than
         the financial statements and supporting schedules included therein, as
         to which no opinion need be rendered) and incorporated or deemed to be
         incorporated by reference in the Prospectus complied when so filed as
         to form in all material respects with the Exchange Act.

         In addition, such counsel shall state that such counsel has
participated in conferences with officials and other representatives of the
Company, the Representatives, counsel for the Underwriters and the independent
certified public accountants of the Company, at which



                                      C-3
   35

conferences the contents of the Registration Statement and Prospectus and
related matters were discussed, and although they have not verified the accuracy
or completeness of the statements contained in the Registration Statement or the
Prospectus, nothing has come to the attention of such counsel which leads them
to believe that, at the time the Registration Statement became effective and at
all times subsequent thereto up to and on the First Closing Date or Second
Closing Date, as the case may be, the Registration Statement and any amendment
or supplement thereto and any Incorporated Document (other than the financial
statements, including supporting schedules, and other financial and statistical
information derived therefrom, as to which such counsel need express no comment)
contained any untrue statement of a material fact or omitted to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading, or at the First Closing Date or the Second Closing Date, as the
case may be, the Registration Statement, the Prospectus and any amendment or
supplement thereto (except as aforesaid) contained any untrue statement of a
material fact or omitted to state a material fact necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading. Such counsel shall also state that the conditions for the
use of Form S-3 set forth in the General Instructions thereto have been
satisfied.










                                      C-4