ARTICLES OF AMENDMENT
TO THE RESTATED ARTICLES OF INCORPORATION
OF
PLEXUS CORP.

        Plexus Corp., a corporation organized and existing under Chapter 180 of the Wisconsin Statutes (the "Corporation"), does hereby certify as follows:

        1.        The name of the Corporation is Plexus Corp.

        2.        Exhibit A to Article 3 of the Restated Articles of Incorporation of the Corporation, as amended (the “Articles”), is hereby amended and restated in its entirety by the text set out in Schedule I hereto, which text creates a series of Preferred Stock that shall be designated as “Series B Junior Participating Preferred Stock” (the “Series B Preferred Stock”).

        3.        The number of shares constituting the Series B Preferred Stock shall be 2,000,000.

        4.        None of the shares of Series B Preferred Stock has been issued as of the date hereof.

        5.        This Amendment to the Articles creating the Series B Preferred Stock was adopted by the Board of Directors of the Corporation on August 28, 2008 in accordance with Section 180.1002 of the Wisconsin Statutes and shareholder action was not required.

        6.        By virtue of this Amendment to the Articles creating the Series B Preferred Stock, the designation of the Corporation’s Series A Junior Participating Preferred Stock, no shares of which have been issued, is revoked, and the Corporation’s Series A Junior Participating Preferred Stock is eliminated.

        IN WITNESS WHEREOF, the undersigned has executed and subscribed these Articles of Amendment on behalf of the Corporation and does affirm the foregoing as true as of the 28^th day of August, 2008.

PLEXUS CORP.

By:  /s/ Angelo M. Ninivaggi

        Angelo M. Ninivaggi

        Vice President, General Counsel and Secretary

This instrument was drafted by, and should be returned to, Peter C. Underwood of the firm of Foley & Lardner LLP, 777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202.

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SCHEDULE I

Exhibit A to Article 3

FORM
OF
CERTIFICATE OF DESIGNATION, PREFERENCES, RIGHTS AND LIMITATIONS
OF
SERIES B JUNIOR PARTICIPATING PREFERRED STOCK
OF
PLEXUS CORP.

(Pursuant to Section 180.06022 of the Wisconsin Business Corporation Law)

        1.       Designation and Amount. There is hereby created a series of Preferred Stock that shall be designated as “Series B Junior Participating Preferred Stock”, $0.01 par value per share (the “Series B Preferred Stock”), and the number of shares constituting such series shall be 2,000,000. Such number of shares may be increased or decreased by resolution of the Board of Directors; provided that no decrease shall reduce the number of shares of Series B Preferred Stock to a number less than the number of shares then outstanding plus the number of shares reserved for issuance upon the exercise of outstanding options, rights or warrants or upon the conversion of any outstanding securities issued by the Corporation into Series B Preferred Stock.

        2.       Dividends and Distributions.

        (A)        The holders of shares of Series B Preferred Stock, in preference to the holders of shares of Common Stock and of any other junior stock, shall be entitled to receive, when, as and if declared by the Board of Directors out of funds legally available for the purpose, quarterly dividends payable in cash on the first business days of January, April, July and October in each year (each such date being referred to herein as a “Quarterly Dividend Payment Date”), commencing on the first Quarterly Dividend Payment Date after the first issuance of a share or fraction of a share of Series B Preferred Stock, in an amount per share (rounded to the nearest cent) equal to the greater of (i) $1.00 or (ii) subject to the provision for adjustment hereinafter set forth, 100 times the aggregate per share amount of all cash dividends, and 100 times the aggregate per share amount (payable in kind) of all noncash dividends or other distributions, other than a dividend payable in shares of Common Stock or a subdivision of the outstanding shares of Common Stock (by reclassification or otherwise), declared on the Common Stock since the immediately preceding Quarterly Dividend Payment Date, or, with respect to the first Quarterly Payment Date, since the first issuance of any share or fraction of a share of Series B Preferred Stock. In the event the Corporation shall at any time after the close of business on August 28, 2008 (the “Rights Declaration Date”) (a) declare any dividend on Common Stock payable in shares of Common Stock, (b) subdivide the outstanding Common Stock, or (c) combine the outstanding Common Stock into a smaller number of shares, then in each such case the amount to which holders of shares of Series B Preferred Stock were entitled immediately prior to such event under clause (ii) of the preceding sentence shall be adjusted by multiplying such amount by a fraction the numerator of which is the number of shares of Common Stock that are outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event.

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        (B)        The Corporation shall declare a dividend or distribution on the Series B Preferred Stock as provided in paragraph (A) above immediately after it declares a dividend or distribution on the Common Stock (other than a dividend payable in shares of Common Stock); provided that, in the event no dividend or distribution shall have been declared on the Common Stock during the period between any Quarterly Dividend Payment Date and the next subsequent Quarterly Dividend Payment Date, a dividend of $1.00 per share on the Series B Preferred Stock shall nevertheless be payable on such subsequent Quarterly Dividend Payment Date.

        (C)        Dividends shall begin to accrue and be cumulative on outstanding shares of Series B Preferred Stock from the Quarterly Dividend Payment Date next preceding the date of issue of such shares of Series B Preferred Stock, unless the date of issue of such shares is prior to the record date for the first Quarterly Dividend Payment Date, in which case dividends on such shares shall begin to accrue from the date of issue of such shares, or unless the date of issue is a Quarterly Dividend Payment Date or is a date after the record date for the determination of holders of shares of Series B Preferred Stock entitled to receive a quarterly dividend and before such Quarterly Dividend Payment Date, in either of which events such dividends shall begin to accrue and be cumulative from such Quarterly Dividend Payment Date. Accrued but unpaid dividends shall not bear interest. Dividends paid on the shares of Series B Preferred Stock in an amount less than the total amount of such dividends at the time accrued and payable on such shares shall be allocated pro rata on a share-by-share basis among all such shares at the time outstanding. The Board of Directors may fix a record date for the determination of holders of shares of Series B Preferred Stock entitled to receive payment of a dividend or distribution declared thereon, which record date shall be no more than 30 days prior to the date fixed for the payment thereof.

        3.       Voting Rights. The holders of shares of Series B Preferred Stock shall have the following voting rights:

        (A)        Subject to the provision for adjustment hereinafter set forth, each share of Series B Preferred Stock shall entitle the holder thereof to 100 votes on all matters submitted to a vote of the shareholders of the Corporation. In the event the Corporation shall at any time declare or pay any dividend on Common Stock payable in shares of Common Stock, or effect a subdivision or combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the number of votes per share to which holders of shares of Series B Preferred Stock were entitled immediately prior to such event shall be adjusted by multiplying such number by a fraction the numerator of which is the number of shares of Common Stock that are outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event.

        (B)        Except as otherwise provided herein, in any other resolution of the Board of Directors creating a series of Preferred Stock or any similar stock, or by law, the holders of shares of Series B Preferred Stock and the holders of shares of Common Stock shall vote together as one class on all matters submitted to a vote of shareholders of the Corporation.

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        (C)        Except as set forth herein, holders of Series B Preferred Stock shall have no special voting rights and their consent shall not be required (except to the extent they are entitled to vote with holders of Common Stock as set forth herein) for taking any corporate action.

        4.       Certain Restrictions.

        (A)        Whenever quarterly dividends or other dividends or distributions payable on the Series B Preferred Stock as provided in Section 2 are in arrears, thereafter and until all accrued and unpaid dividends and distributions, whether or not declared, on shares of Series B Preferred Stock outstanding shall have been paid in full, the Corporation shall not:

        (i)        declare or pay dividends on, make any other distributions on, or redeem or purchase or otherwise acquire for consideration any shares of stock ranking junior (either as to dividends or upon liquidation, dissolution or winding up) to the Series B Preferred Stock;

        (ii)        declare or pay dividends on or make any other distributions on any shares of stock ranking on a parity (either as to dividends or upon liquidation, dissolution or winding up) with the Series B Preferred Stock, except dividends paid ratably on the Series B Preferred Stock and all such parity stock on which dividends are payable or in arrears in proportion to the total amounts to which the holders of all such shares are then entitled;

        (iii)        redeem or purchase or otherwise acquire for consideration shares of any stock ranking on a parity (either as to dividends or upon liquidation, dissolution or winding up) with the Series B Preferred Stock, provided that the Corporation may at any time redeem, purchase or otherwise acquire shares of any such parity stock in exchange for shares of any stock of the Corporation ranking junior to or on a parity with (both as to dividends or upon dissolution, liquidation or winding up) the Series B Preferred Stock; or

        (iv)        purchase or otherwise acquire for consideration any shares of Series B Preferred Stock, or any shares of stock ranking on a parity with the Series B Preferred Stock, except in accordance with a purchase offer made in writing or by publication (as determined by the Board of Directors) to all holders of such shares upon such terms as the Board of Directors, after consideration of the respective annual dividend rates and other relative rights and preferences of the respective series and classes, shall determine in good faith will result in fair and equitable treatment among the respective series or classes.

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        (B)        The Corporation shall not permit any corporation of which an amount of voting securities sufficient to elect at least a majority of the directors of such corporation is beneficially owned, directly or indirectly, by the Corporation or otherwise controlled by the Corporation to purchase or otherwise acquire for consideration any shares of stock of the Corporation unless the Corporation could, under paragraph (A) of this Section 4, purchase or otherwise acquire such shares at such time and in such manner.

        5.       Reacquired Shares. All shares of Series B Preferred Stock that shall at any time have been reacquired by the Corporation shall, after such reacquisition, have the status of authorized but unissued shares of Preferred Stock of the Corporation, without designation as to series, and may be reissued as part of a new series of Preferred Stock to be created by resolution or resolutions of the Board of Directors, subject to the conditions and restrictions on issuance set forth herein.

        6.       Liquidation, Dissolution or Winding Up. Upon any liquidation, dissolution or winding up of the Corporation, no distribution shall be made (A) to the holders of shares of stock ranking junior (either as to dividends or upon liquidation, dissolution or winding up) to the Series B Preferred Stock unless, prior thereto, the holders of shares of Series B Preferred Stock shall have received $100 per share, plus an amount equal to accrued and unpaid dividends and distributions thereon, whether or not declared, to the date of such payment, provided that the holders of shares of Series B Preferred Stock shall be entitled to receive an aggregate amount per share, subject to the provision for adjustment hereinafter set forth, equal to 100 times the aggregate amount to be distributed per share to holders of shares of Common Stock, or (B) to the holders of shares of stock ranking on a parity (either as to dividends or upon liquidation, dissolution or winding up) with the Series B Preferred Stock, except distributions made ratably on the Series B Preferred Stock and all other such parity stock in proportion to the total amounts to which the holders of all such shares are entitled upon such liquidation, dissolution or winding up. In the event the Corporation shall at any time declare or pay any dividend on the Common Stock payable in shares of Common Stock, or effect a subdivision or combination or consolidation of the outstanding shares of Common Stock (by reclassification or otherwise than by payment of a dividend in shares of Common Stock) into a greater or lesser number of shares of Common Stock, then in each such case the aggregate amount to which holders of shares of Series B Preferred Stock were entitled immediately prior to such event under the proviso in clause (A) of the preceding sentence shall be adjusted by multiplying such amount by a fraction the numerator of which is the number of shares of Common Stock outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event.

        7.       Consolidation, Merger, etc. In case the Corporation shall enter into any consolidation, merger, combination, share exchange or other transaction in which the shares of Common Stock are exchanged for or changed into other stock or securities, cash and/or any other property, then in any such case the shares of Series B Preferred Stock shall at the same time be similarly exchanged or changed in an amount per share (subject to the provision for adjustment hereinafter set forth) equal to 100 times the aggregate amount of stock, securities, cash and/or any other property (payable in kind), as the case may be, into which or for which each share of Common Stock is changed or exchanged. In the event the Corporation shall at any time after the Rights Declaration Date (A) declare any dividend on Common Stock payable in shares of Common Stock, (B) subdivide the outstanding Common Stock, or (C) combine the outstanding shares of Common Stock into a smaller number of shares, then in each such case the amount set forth in the preceding sentence with respect to the exchange or change of shares of Series B Preferred Stock shall be adjusted by multiplying such amount by a fraction the numerator of which is the number of shares of Common Stock that are outstanding immediately after such event and the denominator of which is the number of shares of Common Stock that were outstanding immediately prior to such event.

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        8.       No Redemption. The shares of Series B Preferred Stock shall not be redeemable.

        9.       Amendment. To the fullest extent permitted by applicable law, prior to such time as shares of Series B Preferred Stock are issued and outstanding, the Board of Directors may modify, amend, alter or revoke any of the number of shares of Series B Preferred Stock, the powers, preferences or special rights of the Series B Preferred Stock or the other terms of the Series B Preferred Stock. From and after such time as shares of Series B Preferred Stock are issued and outstanding, the Restated Articles of Incorporation of the Corporation shall not be amended in any manner that would materially alter or change the powers, preferences or special rights of the Series B Preferred Stock so as to affect them adversely without the affirmative vote of the holders of at least two-thirds of the outstanding shares of Series B Preferred Stock, voting together as a single class.

        10.       Fractional Shares. Series B Preferred Stock may be issued in fractions of a share which shall entitle the holder, in proportion to such holder’s fractional shares, to exercise voting rights, receive dividends, participate in distributions and to have the benefit of all other rights of holders of Series B Preferred Stock.

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