Document:

Forms of 5.95% Notes due February 1, 2037

 Exhibit 4(d) 
 Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York Corporation (“DTC”), to Issuer or its agent for registration of transfer, exchange, or payment, and any certificate
issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. 
 This Security is a Book-Entry Security within the meaning of the Indenture hereinafter referred to and is registered in the name of a Depositary or a nominee thereof.
This Security may not be transferred to, or registered or exchanged for Securities registered in the name of, any Person other than the Depositary or a nominee thereof and no such transfer may be registered, except in the limited circumstances
described in the Indenture. Every Security authenticated and delivered upon registration of transfer of, or in exchange for or in lieu of, this Security shall be a Book-Entry Security subject to the foregoing, except in such limited circumstances
described in the Indenture. 
 ALCOA INC. 
 5.95% Notes Due 2037 
  

			
	 No. R-1
	 	(U.S.) $500,000,000
		 	CUSIP # 013817AK7

 Alcoa Inc., a corporation duly organized and existing under the laws of Pennsylvania (herein
called the “Company”, which term includes any successor Person under the Indenture referred to on the reverse hereof), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of Five
Hundred Million (United States) Dollars on February 1, 2037, and to pay interest thereon from January 25, 2007, or from the most recent February 1 or August 1 (each, an “Interest Payment Date”) to which interest has
been paid or duly provided for, semi-annually in arrears on February 1 and August 1 in each year, commencing August 1, 2007, at the rate of 5.95% per annum, until the principal hereof is paid or made available for payment. The
interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of
business on the Regular Record Date for such interest, which shall be the January 15 or July 15 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Interest will be paid on the basis of a 360-day
year consisting of twelve 30-day months. Except as otherwise provided in the Indenture, any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid
to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to
Holders of Securities of this 

 
series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of
any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture. Payment of the principal of and any premium and interest on this
Security will be made (a) at the Corporate Trust Office of the Trustee or such other office or agency of the Company as may be designated by it for such purpose in the Borough of Manhattan, The City of New York, in such coin or currency of the
United States of America as at the time of payment shall be legal tender for the payment of public and private debts or (b) subject to any laws or regulations applicable thereto and to the right of the Company (limited as provided in the
Indenture) to rescind the designation of any such Paying Agent, at the main offices of the Company in Pittsburgh, Pennsylvania, or at such other offices or agencies as the Company may designate, by United States dollar check drawn on, or transfer to
a United States dollar account maintained by the payee with, a bank in The City of New York; provided, however, that at the option of the Company payment of interest may be made by United States dollar check mailed to the address of the Person
entitled thereto as such address shall appear in the Security Register. 
 Reference is hereby made to the further provisions of this
Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place. 
 Unless the
certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof, directly or through an Authenticating Agent, by manual signature of an authorized signatory, this Security shall not be entitled to any benefit
under the Indenture or be valid or obligatory for any purpose. 
 IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its corporate seal. 
 Dated: January 25, 2007 
  

									
		 		 		 	ALCOA INC.
					
	Attest:	 	 /s/ Brenda A. Hart
	 		 	By:	 	 /s/ Charles D. McLane, Jr.

		 	Assistant Secretary	 		 		 	Vice President and
		 		 		 		 	Chief Financial Officer

 [SEAL] 

 CERTIFICATE OF AUTHENTICATION 
 This is one of the Securities of 
 the series designated therein 
 referred to in the within- 
 mentioned Indenture. 
 THE BANK OF NEW YORK TRUST COMPANY, N. A. 
 as Trustee 
  

			
	By:	 	 /s/ Brian D. Butler

		 	Authorized Signatory

 This Security is one of a duly authorized issue of securities of the Company (herein called the
“Securities”), issued and to be issued in one or more series under an Indenture, dated as of September 30, 1993 (herein, as supplemented by the First Supplemental Indenture dated January 25, 2007 between the Company and the
Trustee (as defined below), called the “Indenture”), between the Company and The Bank of New York Trust Company, N.A., as successor to J. P. Morgan Trust Company, National Association (formerly Chase Manhattan Trust Company, National
Association), as successor trustee to PNC Bank, National Association, as Trustee (herein called the “Trustee”, which term includes any successor trustee under the Indenture), to which Indenture and all indentures supplemental thereto
reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be,
authenticated and delivered. This Security is one of the series designated on the face hereof, initially issued in the aggregate principal amount of (U.S.) $625,000,000. 
 The Securities of this series are subject to redemption, as a whole or in part, at the option of the Company, at any time or from time to time, on at least 30 days, but not more than 60 days, prior notice to the
Holders of the Securities of this series given as described below, at a redemption price equal to the greater of: 
  

	 	•	 	 100% of the principal amount to be redeemed, plus accrued interest, if any, to the redemption date; or 

  

	 	•	 	 the sum of the present values of the Remaining Scheduled Payments, as defined below, discounted, on a semiannual basis, assuming a 360-day year consisting of twelve
30-day months, at the Treasury Rate, as defined below, plus 20 basis points, plus accrued interest to the date of redemption which has not been paid. 

 “Treasury Rate” means, with respect to any redemption date: 
  

	 	•	 	 the yield, under the heading which represents the average for the immediately preceding week, appearing in the most recently published statistical release
designated “H.15(519)” or any successor publication which is published weekly by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded United States Treasury securities adjusted to constant
maturity under the caption “Treasury Constant Maturities,” for the maturity corresponding to the Comparable Treasury Issue; provided that if no maturity is within three months before or after the maturity date for this Security, yields for
the two published maturities most closely corresponding to the Comparable Treasury Issue will be determined and the Treasury Rate will be interpolated or extrapolated from those yields on a straight line basis rounding to the nearest month; or

  

	 	•	 	 if that release, or any successor release, is not published during the week preceding the calculation date or does not contain such yields, the rate per 

 
annum equal to the semiannual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for the Comparable Treasury Issue
(expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for that redemption date. 
 The Treasury Rate will be calculated
on the third business day preceding the redemption date. 
 “Comparable Treasury Issue” means the United States Treasury security
selected by an Independent Investment Banker as having a maturity comparable to the remaining term of this Security to be redeemed that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new
issues of corporate debt securities of comparable maturity to the remaining term of this Security. 
 “Independent Investment
Banker” means one of the Reference Treasury Dealers, to be appointed by the Company. 
 “Comparable Treasury Price” means,
with respect to any redemption date for this Security: 
  

	 	•	 	 the average of four Reference Treasury Dealer Quotations for the redemption date, after excluding the highest and lowest of such Reference Treasury Dealer
Quotations; or 

  

	 	•	 	 if the Trustee obtains fewer than four Reference Treasury Dealer Quotations, the average of all quotations obtained by the Trustee. 

 “Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the average, as
determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue, expressed in each case as a percentage of its principal amount, quoted in writing to the Trustee by such Reference Treasury Dealer at 3:30 p.m., New York
City time, on the third business day preceding such redemption date. 
 “Reference Treasury Dealer” means each of Citigroup Global
Markets Inc, Credit Suisse Securities (USA) LLC, Deutsche Bank Securities Inc. and J.P.Morgan Securities Inc., and their respective successors; provided, however, that if any of the foregoing shall cease to be a primary U.S. Government securities
dealer, which we refer to as a “Primary Treasury Dealer,” the Company will substitute therefor another nationally recognized investment banking firm that is a Primary Treasury Dealer. 
 “Remaining Scheduled Payments” means, with respect to each Security to be redeemed, the remaining scheduled payments of the principal thereof
and interest thereon that would be due after the related redemption date but for such redemption; provided, however, that, if such redemption date is not an interest payment date with respect to such Security, the amount of the next succeeding
scheduled interest payment thereon will be deemed to be reduced by the amount of interest accrued thereon to such redemption date. 

 In the event of redemption of this Security in part only, a new Security or Securities of this series and
of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof. 
 Notice of
redemption will be given by mail to Holders of Securities of this series, not less than 30 nor more than 60 days prior to the date fixed for redemption, all as provided in the Indenture. 
 If a Change of Control Repurchase Event occurs and this Security has not been previously redeemed, the Company will make an offer to each Holder of
Securities of this series to repurchase all or any part (in integral multiples of $1,000) of that Holder’s Securities of this series at a repurchase price in cash equal to 101% of the aggregate principal amount of Securities of this series
repurchased plus any accrued and unpaid interest on the Securities of this series repurchased to, but not including, the date of repurchase. Within 30 days following any Change of Control Repurchase Event or, at the option of the Company, prior to
any Change of Control, but after the public announcement of the Change of Control, we will mail a notice to each Holder, with a copy to the Trustee, describing the transaction or transactions that constitute or may constitute the Change of Control
Repurchase Event and offering to repurchase Securities of this series on the payment date specified in the notice, which date will be no earlier than 30 days and no later than 60 days from the date such notice is mailed. The notice shall, if mailed
prior to the date of consummation of the Change of Control, state that the offer to purchase is conditioned on a Change of Control Repurchase Event occurring on or prior to the payment date specified in the notice. To the extent that the provisions
of any securities laws or regulations conflict with the Change of Control Repurchase event provisions of this Security, the Company may comply with the applicable securities laws and regulations and will not be deemed to have breached its
obligations under the Change of Control Repurchase Event provisions of this Security by virtue of such conflict. 
 On the repurchase date
following a Change of Control Repurchase Event, the Company will, to the extent lawful: 
 (1) accept for payment all Securities of this
series or portions of Securities of this series properly tendered pursuant to its offer; 
 (2) deposit with the Paying Agent an amount equal
to the aggregate purchase price in respect of all Securities of this series or portions of Securities of this series properly tendered; and 
 (3) deliver or cause to be delivered to the Trustee the Securities of this series properly accepted, together with an Officers’ Certificate stating the aggregate principal amount of Securities of this series being purchased by the
Company. 
 The Paying Agent will promptly mail to each Holder of Securities of this series properly tendered the purchase price for the
Securities of this series, and the Trustee will promptly authenticate and mail (or cause to be transferred by book-entry) to each Holder a new Security of this series equal in principal amount to any unpurchased portion of any Securities of 

 
this series surrendered; provided that each new Security of this series will be in a principal amount of an integral multiple of $1,000. 
 The Company will not be required to make an offer to repurchase the Securities of this series upon a Change of Control Repurchase Event if a third party
makes such an offer in the manner, at the times and otherwise in compliance with the requirements for an offer made by the Company and such third party purchases all Securities of this series properly tendered and not withdrawn under such offer.

 “Below Investment Grade Ratings Event” means that on any day within the 60-day period (which period shall be extended so long as
the rating of the Securities of this Series is under publicly announced consideration for a possible downgrade by any of the Rating Agencies) after the earlier of (1) the occurrence of a Change of Control; or (2) public notice of the
occurrence of a Change of Control or the intention by the Company to effect a Change of Control, the Securities of this series are rated below Investment Grade by each of the Rating Agencies. Notwithstanding the foregoing, a Below Investment Grade
Ratings Event otherwise arising by virtue of a particular reduction in rating shall not be deemed to have occurred in respect of a particular Change of Control (and thus shall not be deemed a Below Investment Grade Ratings Event for purposes of the
definition of Change of Control Repurchase Event hereunder) if the Rating Agencies making the reduction in rating to which this definition would otherwise apply do not announce or publicly confirm or inform the Trustee in writing at its request that
the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising as a result of, or in respect of, the applicable Change of Control (whether or not the applicable Change of Control shall have occurred at the
time of the Ratings Event). 
 “Change of Control” means the consummation of any transaction (including, without limitation, any
merger or consolidation) the result of which is that any “person” (as that term is used in Section 13(d)(3) of the Exchange Act), other than the Company, its subsidiaries, or its or such subsidiaries’ employee benefit plans,
becomes the beneficial owner (as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of more than 50% of the combined voting power of the Company’s Voting Stock or other Voting Stock into which the
Company’s Voting Stock is reclassified, consolidated, exchanged or changed measured by voting power rather than number of shares. 
 “Change of Control Repurchase Event” means the occurrence of both a Change of Control and a Below Investment Grade Ratings Event. 
 “Fitch” means Fitch Ratings Ltd. 
 “Investment Grade” means a rating of Baa3 or better
by Moody’s (or its equivalent under any successor rating categories of Moody’s); a rating of BBB- or better by S&P or Fitch (or its equivalent under any successor rating categories of S&P and Fitch); and the equivalent investment
grade credit rating from any additional Rating Agency or Rating Agencies selected by the Company. 
 “Moody’s” means
Moody’s Investors Service Inc. 

 “Rating Agency” means (1) each of Moody’s, S&P and Fitch; and (2) if any of
Moody’s, S&P or Fitch ceases to rate the Securities of this series or fails to make a rating of the Securities of this series publicly available for reasons outside of the control of the Company, a “nationally recognized statistical
rating organization” within the meaning of Rule 15c3-1(c)(2)(vi)(F) under the Exchange Act, selected by the Company (as certified by a resolution of the Board of Directors) as a replacement agency for Moody’s, S&P or Fitch, or all of
them, as the case may be. 
 “S&P” means Standard & Poor’s Ratings Services, a division of McGraw-Hill, Inc.

 “Voting Stock” of any specified “person” (as that term is used in Section 13(d)(3) of the Exchange Act) as of any
date means the capital stock of such person that is at the time entitled to vote generally in the election of the board of directors of such person. 
 If an Event of Default with respect to Securities of this series shall occur and be continuing, the principal of the Securities of this series may be declared due and payable in the manner and with the effect provided
in the Indenture. 
 The provisions relating to defeasance and discharge set forth in Section 1302 of the Indenture and covenant
defeasance set forth in Section 1303 of the Indenture are applicable to the Securities of this series. 
 The Indenture permits, with
certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the
Company and the Trustee with the consent of the Holders of 50% in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in
principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the
Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer
hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security. 
 As set
forth in, and subject to, the provisions of the Indenture, no Holder of any Security of this series will have any right to institute any proceeding with respect to the Indenture or for any remedy thereunder, unless such Holder shall have previously
given to the Trustee written notice of a continuing Event of Default with respect to this series, the Holders of not less than 25% in principal amount of the Outstanding Securities of this series shall have made written request, and offered
reasonable indemnity, to the Trustee to institute such proceeding as trustee, and the Trustee shall not have received from the Holders of a majority in principal amount of the Outstanding Securities of this series a direction inconsistent with such
request and shall have failed to institute such proceeding within 60 days; provided, however, that such limitations do 

 
not apply to a suit instituted by the Holder hereof for the enforcement of payment of the principal of and any premium or interest on this Security on or
after the respective due dates expressed herein. 
 No reference herein to the Indenture, and no provision of this Security or of the
Indenture, shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of (and premium, if any) and interest on this Security at the times, place(s) and rate, and in the coin or currency, herein
prescribed. 
 As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is
registrable in the Security Register, upon surrender of this Security for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Security are payable or, subject to
any laws or regulations applicable thereto and to the right of the Company (limited as provided in the Indenture) to rescind the designation of any such transfer agent, at the main offices of the Company in Pittsburgh, Pennsylvania and in or at such
other offices or agencies as the Company may designate, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly
authorized in writing, and thereupon one or more new Securities of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. 
 The Securities of this series are issuable only in registered form, without coupons, in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series and of like tenor of a different authorized denomination,
as requested by the Holder surrendering the same. 
 No service charge shall be made for any such registration of transfer or exchange, but
the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith. 
 Prior
to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the owner hereof for all purposes, whether or
not this Security is overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary. 
 As used
in this Security, “Business Day” means any day other than a Saturday or Sunday, that is not a day on which banking institutions are authorized or obligated by law or executive order to close in The City of New York. All other terms used in
this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture. 

 Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York
Corporation (“DTC”), to Issuer or its agent for registration of transfer, exchange, or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized
representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL
inasmuch as the registered owner hereof, Cede & Co., has an interest herein. 
 This Security is a Book-Entry Security within the meaning of the
Indenture hereinafter referred to and is registered in the name of a Depositary or a nominee thereof. This Security may not be transferred to, or registered or exchanged for Securities registered in the name of, any Person other than the Depositary
or a nominee thereof and no such transfer may be registered, except in the limited circumstances described in the Indenture. Every Security authenticated and delivered upon registration of transfer of, or in exchange for or in lieu of, this Security
shall be a Book-Entry Security subject to the foregoing, except in such limited circumstances described in the Indenture. 
 ALCOA INC.

 5.95% Notes Due 2037 
  

			
	 No. R-2
	 	(U.S.) $125,000,000
		 	CUSIP # 013817AK7

 Alcoa Inc., a corporation duly organized and existing under the laws of Pennsylvania (herein
called the “Company”, which term includes any successor Person under the Indenture referred to on the reverse hereof), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of One
Hundred Twenty-Five Million (United States) Dollars on February 1, 2037, and to pay interest thereon from January 25, 2007, or from the most recent February 1 or August 1 (each, an “Interest Payment Date”) to which
interest has been paid or duly provided for, semi-annually in arrears on February 1 and August 1 in each year, commencing August 1, 2007, at the rate of 5.95% per annum, until the principal hereof is paid or made available for
payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at
the close of business on the Regular Record Date for such interest, which shall be the January 15 or July 15 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Interest will be paid on the basis
of a 360-day year consisting of twelve 30-day months. Except as otherwise provided in the Indenture, any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may
either be paid to the Person in whose name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof
shall be given to 

 
Holders of Securities of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not
inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture. Payment of the principal of
and any premium and interest on this Security will be made (a) at the Corporate Trust Office of the Trustee or such other office or agency of the Company as may be designated by it for such purpose in the Borough of Manhattan, The City of New
York, in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of public and private debts or (b) subject to any laws or regulations applicable thereto and to the right of the
Company (limited as provided in the Indenture) to rescind the designation of any such Paying Agent, at the main offices of the Company in Pittsburgh, Pennsylvania, or at such other offices or agencies as the Company may designate, by United States
dollar check drawn on, or transfer to a United States dollar account maintained by the payee with, a bank in The City of New York; provided, however, that at the option of the Company payment of interest may be made by United States dollar check
mailed to the address of the Person entitled thereto as such address shall appear in the Security Register. 
 Reference is hereby made to
the further provisions of this Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place. 
 Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof, directly or through an Authenticating Agent, by manual signature of an authorized signatory, this
Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose. 
 IN WITNESS WHEREOF, the
Company has caused this instrument to be duly executed under its corporate seal. 
 Dated: January 25, 2007 
  

									
		 		 		 	ALCOA INC.
					
	Attest:	 	 /s/ Brenda A. Hart
	 		 	By:	 	 /s/ Charles D. McLane, Jr.

		 	Assistant Secretary	 		 		 	Vice President and
		 		 		 		 	Chief Financial Officer

 [SEAL] 

 CERTIFICATE OF AUTHENTICATION 
 This is one of the Securities of 
 the series designated therein 
 referred to in the within- 
 mentioned Indenture. 
 THE BANK OF NEW YORK TRUST COMPANY, N. A. 
 as Trustee 
  

			
	By:	 	 /s/ Brian D. Butler

		 	Authorized Signatory

 This Security is one of a duly authorized issue of securities of the Company (herein called the
“Securities”), issued and to be issued in one or more series under an Indenture, dated as of September 30, 1993 (herein, as supplemented by the First Supplemental Indenture dated January 25, 2007 between the Company and the
Trustee (as defined below), called the “Indenture”), between the Company and The Bank of New York Trust Company, N.A., as successor to J. P. Morgan Trust Company, National Association (formerly Chase Manhattan Trust Company, National
Association), as successor trustee to PNC Bank, National Association, as Trustee (herein called the “Trustee”, which term includes any successor trustee under the Indenture), to which Indenture and all indentures supplemental thereto
reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be,
authenticated and delivered. This Security is one of the series designated on the face hereof, initially issued in the aggregate principal amount of (U.S.) $625,000,000. 
 The Securities of this series are subject to redemption, as a whole or in part, at the option of the Company, at any time or from time to time, on at least 30 days, but not more than 60 days, prior notice to the
Holders of the Securities of this series given as described below, at a redemption price equal to the greater of: 
  

	 	•	 	 100% of the principal amount to be redeemed, plus accrued interest, if any, to the redemption date; or 

  

	 	•	 	 the sum of the present values of the Remaining Scheduled Payments, as defined below, discounted, on a semiannual basis, assuming a 360-day year consisting of twelve
30-day months, at the Treasury Rate, as defined below, plus 20 basis points, plus accrued interest to the date of redemption which has not been paid. 

 “Treasury Rate” means, with respect to any redemption date: 
  

	 	•	 	 the yield, under the heading which represents the average for the immediately preceding week, appearing in the most recently published statistical release
designated “H.15(519)” or any successor publication which is published weekly by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded United States Treasury securities adjusted to constant
maturity under the caption “Treasury Constant Maturities,” for the maturity corresponding to the Comparable Treasury Issue; provided that if no maturity is within three months before or after the maturity date for this Security, yields for
the two published maturities most closely corresponding to the Comparable Treasury Issue will be determined and the Treasury Rate will be interpolated or extrapolated from those yields on a straight line basis rounding to the nearest month; or

  

	 	•	 	 if that release, or any successor release, is not published during the week preceding the calculation date or does not contain such yields, the rate per 

	 	 
annum equal to the semiannual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for the Comparable Treasury Issue
(expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for that redemption date. 

 The Treasury Rate
will be calculated on the third business day preceding the redemption date. 
 “Comparable Treasury Issue” means the United States
Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining term of this Security to be redeemed that would be utilized, at the time of selection and in accordance with customary financial
practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of this Security. 
 “Independent Investment Banker” means one of the Reference Treasury Dealers, to be appointed by the Company. 
 “Comparable Treasury Price” means, with respect to any redemption date for this Security: 
  

	 	•	 	 the average of four Reference Treasury Dealer Quotations for the redemption date, after excluding the highest and lowest of such Reference Treasury Dealer
Quotations; or 

  

	 	•	 	 if the Trustee obtains fewer than four Reference Treasury Dealer Quotations, the average of all quotations obtained by the Trustee. 

 “Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the average, as
determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue, expressed in each case as a percentage of its principal amount, quoted in writing to the Trustee by such Reference Treasury Dealer at 3:30 p.m., New York
City time, on the third business day preceding such redemption date. 
 “Reference Treasury Dealer” means each of Citigroup Global
Markets Inc, Credit Suisse Securities (USA) LLC, Deutsche Bank Securities Inc. and J.P.Morgan Securities Inc., and their respective successors; provided, however, that if any of the foregoing shall cease to be a primary U.S. Government securities
dealer, which we refer to as a “Primary Treasury Dealer,” the Company will substitute therefor another nationally recognized investment banking firm that is a Primary Treasury Dealer. 
 “Remaining Scheduled Payments” means, with respect to each Security to be redeemed, the remaining scheduled payments of the principal thereof
and interest thereon that would be due after the related redemption date but for such redemption; provided, however, that, if such redemption date is not an interest payment date with respect to such Security, the amount of the next succeeding
scheduled interest payment thereon will be deemed to be reduced by the amount of interest accrued thereon to such redemption date. 
  

 In the event of redemption of this Security in part only, a new Security or Securities of this series and
of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof. 
 Notice of
redemption will be given by mail to Holders of Securities of this series, not less than 30 nor more than 60 days prior to the date fixed for redemption, all as provided in the Indenture. 
 If a Change of Control Repurchase Event occurs and this Security has not been previously redeemed, the Company will make an offer to each Holder of
Securities of this series to repurchase all or any part (in integral multiples of $1,000) of that Holder’s Securities of this series at a repurchase price in cash equal to 101% of the aggregate principal amount of Securities of this series
repurchased plus any accrued and unpaid interest on the Securities of this series repurchased to, but not including, the date of repurchase. Within 30 days following any Change of Control Repurchase Event or, at the option of the Company, prior to
any Change of Control, but after the public announcement of the Change of Control, we will mail a notice to each Holder, with a copy to the Trustee, describing the transaction or transactions that constitute or may constitute the Change of Control
Repurchase Event and offering to repurchase Securities of this series on the payment date specified in the notice, which date will be no earlier than 30 days and no later than 60 days from the date such notice is mailed. The notice shall, if mailed
prior to the date of consummation of the Change of Control, state that the offer to purchase is conditioned on a Change of Control Repurchase Event occurring on or prior to the payment date specified in the notice. To the extent that the provisions
of any securities laws or regulations conflict with the Change of Control Repurchase event provisions of this Security, the Company may comply with the applicable securities laws and regulations and will not be deemed to have breached its
obligations under the Change of Control Repurchase Event provisions of this Security by virtue of such conflict. 
 On the repurchase date
following a Change of Control Repurchase Event, the Company will, to the extent lawful: 
 (1) accept for payment all Securities of this
series or portions of Securities of this series properly tendered pursuant to its offer; 
 (2) deposit with the Paying Agent an amount equal
to the aggregate purchase price in respect of all Securities of this series or portions of Securities of this series properly tendered; and 
 (3) deliver or cause to be delivered to the Trustee the Securities of this series properly accepted, together with an Officers’ Certificate stating the aggregate principal amount of Securities of this series being purchased by the
Company. 
 The Paying Agent will promptly mail to each Holder of Securities of this series properly tendered the purchase price for the
Securities of this series, and the Trustee will promptly authenticate and mail (or cause to be transferred by book-entry) to each Holder a new Security of this series equal in principal amount to any unpurchased portion of any Securities of 

 
this series surrendered; provided that each new Security of this series will be in a principal amount of an integral multiple of $1,000. 
 The Company will not be required to make an offer to repurchase the Securities of this series upon a Change of Control Repurchase Event if a third party
makes such an offer in the manner, at the times and otherwise in compliance with the requirements for an offer made by the Company and such third party purchases all Securities of this series properly tendered and not withdrawn under such offer.

 “Below Investment Grade Ratings Event” means that on any day within the 60-day period (which period shall be extended so long as
the rating of the Securities of this Series is under publicly announced consideration for a possible downgrade by any of the Rating Agencies) after the earlier of (1) the occurrence of a Change of Control; or (2) public notice of the
occurrence of a Change of Control or the intention by the Company to effect a Change of Control, the Securities of this series are rated below Investment Grade by each of the Rating Agencies. Notwithstanding the foregoing, a Below Investment Grade
Ratings Event otherwise arising by virtue of a particular reduction in rating shall not be deemed to have occurred in respect of a particular Change of Control (and thus shall not be deemed a Below Investment Grade Ratings Event for purposes of the
definition of Change of Control Repurchase Event hereunder) if the Rating Agencies making the reduction in rating to which this definition would otherwise apply do not announce or publicly confirm or inform the Trustee in writing at its request that
the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising as a result of, or in respect of, the applicable Change of Control (whether or not the applicable Change of Control shall have occurred at the
time of the Ratings Event). 
 “Change of Control” means the consummation of any transaction (including, without limitation, any
merger or consolidation) the result of which is that any “person” (as that term is used in Section 13(d)(3) of the Exchange Act), other than the Company, its subsidiaries, or its or such subsidiaries’ employee benefit plans,
becomes the beneficial owner (as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of more than 50% of the combined voting power of the Company’s Voting Stock or other Voting Stock into which the
Company’s Voting Stock is reclassified, consolidated, exchanged or changed measured by voting power rather than number of shares. 
 “Change of Control Repurchase Event” means the occurrence of both a Change of Control and a Below Investment Grade Ratings Event. 
 “Fitch” means Fitch Ratings Ltd. 
 “Investment Grade” means a rating of Baa3 or better
by Moody’s (or its equivalent under any successor rating categories of Moody’s); a rating of BBB- or better by S&P or Fitch (or its equivalent under any successor rating categories of S&P and Fitch); and the equivalent investment
grade credit rating from any additional Rating Agency or Rating Agencies selected by the Company. 
 “Moody’s” means
Moody’s Investors Service Inc. 

 “Rating Agency” means (1) each of Moody’s, S&P and Fitch; and (2) if any of
Moody’s, S&P or Fitch ceases to rate the Securities of this series or fails to make a rating of the Securities of this series publicly available for reasons outside of the control of the Company, a “nationally recognized statistical
rating organization” within the meaning of Rule 15c3-1(c)(2)(vi)(F) under the Exchange Act, selected by the Company (as certified by a resolution of the Board of Directors) as a replacement agency for Moody’s, S&P or Fitch, or all of
them, as the case may be. 
 “S&P” means Standard & Poor’s Ratings Services, a division of McGraw-Hill, Inc.

 “Voting Stock” of any specified “person” (as that term is used in Section 13(d)(3) of the Exchange Act) as of any
date means the capital stock of such person that is at the time entitled to vote generally in the election of the board of directors of such person. 
 If an Event of Default with respect to Securities of this series shall occur and be continuing, the principal of the Securities of this series may be declared due and payable in the manner and with the effect provided
in the Indenture. 
 The provisions relating to defeasance and discharge set forth in Section 1302 of the Indenture and covenant
defeasance set forth in Section 1303 of the Indenture are applicable to the Securities of this series. 
 The Indenture permits, with
certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the
Company and the Trustee with the consent of the Holders of 50% in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in
principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the
Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer
hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security. 
 As set
forth in, and subject to, the provisions of the Indenture, no Holder of any Security of this series will have any right to institute any proceeding with respect to the Indenture or for any remedy thereunder, unless such Holder shall have previously
given to the Trustee written notice of a continuing Event of Default with respect to this series, the Holders of not less than 25% in principal amount of the Outstanding Securities of this series shall have made written request, and offered
reasonable indemnity, to the Trustee to institute such proceeding as trustee, and the Trustee shall not have received from the Holders of a majority in principal amount of the Outstanding Securities of this series a direction inconsistent with such
request and shall have failed to institute such proceeding within 60 days; provided, however, that such limitations do 

 
not apply to a suit instituted by the Holder hereof for the enforcement of payment of the principal of and any premium or interest on this Security on or
after the respective due dates expressed herein. 
 No reference herein to the Indenture, and no provision of this Security or of the
Indenture, shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of (and premium, if any) and interest on this Security at the times, place(s) and rate, and in the coin or currency, herein
prescribed. 
 As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is
registrable in the Security Register, upon surrender of this Security for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Security are payable or, subject to
any laws or regulations applicable thereto and to the right of the Company (limited as provided in the Indenture) to rescind the designation of any such transfer agent, at the main offices of the Company in Pittsburgh, Pennsylvania and in or at such
other offices or agencies as the Company may designate, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly
authorized in writing, and thereupon one or more new Securities of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. 
 The Securities of this series are issuable only in registered form, without coupons, in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series and of like tenor of a different authorized denomination,
as requested by the Holder surrendering the same. 
 No service charge shall be made for any such registration of transfer or exchange, but
the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith. 
 Prior
to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the owner hereof for all purposes, whether or
not this Security is overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary. 
 As used
in this Security, “Business Day” means any day other than a Saturday or Sunday, that is not a day on which banking institutions are authorized or obligated by law or executive order to close in The City of New York. All other terms used in
this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture.Form of Sipex Voting Agreement

 Exhibit 10.1 
 
FORM OF SIPEX VOTING AGREEMENT 
 THIS VOTING AGREEMENT (this “Agreement”) is made and
entered into as of May     , 2007 by and between Exar Corporation, a Delaware corporation (“Exar”), and the undersigned stockholder (the “Stockholder”) of Sipex Corporation, a Delaware
corporation (“Sipex”). 
 RECITALS: 
 A. Exar, Side Acquisition Corp., a Delaware corporation and wholly owned subsidiary of Exar (“Merger Sub”), and Sipex are entering into an Agreement and Plan of Merger of even date herewith (the
“Merger Agreement”), which provides for the merger (the “Merger”) of Merger Sub with and into Sipex, pursuant to which all outstanding capital stock of Sipex will be converted into the right to receive shares of
capital stock of Exar, as set forth in the Merger Agreement. 
 B. The Stockholder is the beneficial owner (as defined in Rule 13d-3 under
the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) of such number of shares of the outstanding capital stock of Sipex, and such number of shares of capital stock of Sipex issuable upon the exercise of outstanding
options and other rights to acquire Sipex capital stock, as is indicated on the signature page of this Agreement. 
 C. In consideration of
the execution of the Merger Agreement by Exar, the Stockholder (in his or her capacity as such) has agreed to vote the Shares (as defined below) so as to facilitate consummation of the Merger. 
 NOW, THEREFORE, intending to be legally bound hereby, the parties hereto hereby agree as follows: 
 1. Certain Definitions. Capitalized terms used but not defined herein shall have the respective meanings ascribed thereto in the Merger Agreement.
For all purposes of and under this agreement, the following terms shall have the following respective meanings: 
 (a) “Expiration
Date” shall mean the earlier to occur of (i) such date and time as the Merger Agreement shall have been validly terminated pursuant to its terms, or (ii) such date and time as the Merger shall become effective in accordance with
the terms and conditions set forth in the Merger Agreement. 
 (b) “Shares” shall mean: (i) all securities of Sipex
(including all shares of capital stock of Sipex and all options, warrants and other rights to acquire shares of capital stock of Sipex ) owned by the Stockholder as of the date of this Agreement, and (ii) all additional securities of Sipex
(including all additional shares of capital stock of Sipex and all additional options, warrants and other rights to acquire shares of capital stock of Sipex ) of which the Stockholder acquires beneficial ownership during the period commencing with
the execution and delivery of this Agreement until the Expiration Date. 

 (c) “Transfer.” A Person shall be deemed to have effected a “Transfer”
of a security if such Person directly or indirectly (i) sells, pledges, encumbers, grants an option with respect to (including any short sale), establishes an open “put equivalent position” within the meaning of Rule 16a-h under the
Exchange Act, transfers or otherwise disposes of such security or any interest therein, (ii) enters into an agreement or commitment providing for the sale of, pledge of, encumbrance of, grant of an option with respect to (including any short
sale), establishment of a “put equivalent position” with respect to, transfer of or other disposition of such security or any interest therein, or (iii) enters into any swap or other agreement or any transaction that transfers, in
whole or in part, directly or indirectly, the economic consequences of ownership of any Shares, whether any such swap or transaction is to be settled by delivery of Shares or other securities, in cash or otherwise. 
 2. TRANSFER OF SHARES. 
 (a)
Transfer of Shares. The Stockholder hereby agrees that, at all times during the period commencing with the execution and delivery of this Agreement until the Expiration Date, the Stockholder shall not cause or permit any Transfer of any of
the Shares to be effected or make any offer regarding any Transfer of any of the Shares; provided, however, that the Stockholder may (i) Transfer Shares to a family member or trust for estate planning purposes, provided that, as a
condition to any such Transfer to a family member or trust, the transferee has agreed with Exar in writing to be bound by the terms of this Agreement (including granting a Proxy as contemplated hereby) and to hold such Shares subject to all the
terms and provisions of this Agreement, (ii) sell Shares pursuant to the terms of a trading plan adopted pursuant to Rule 10b5-1 under the Exchange Act in effect prior to the date hereof, and (iii) in connection with the exercise of an
Sipex Stock Option (cashless or otherwise) in, sell Shares an amount that is sufficient to satisfy the payment of any transaction costs and any Tax liability incurred by such Stockholder in connection with such exercise. 
 (b) Transfer of Voting Rights. The Stockholder hereby agrees that, at all times commencing with the execution and delivery of this Agreement until
the Expiration Date, the Stockholder shall not deposit, or permit the deposit of, any Shares in a voting trust, grant any proxy in respect of the Shares, or enter into any voting agreement or similar arrangement, commitment or understanding in a
manner inconsistent with the terms of Section 3 hereof or otherwise in contravention of the obligations of the Stockholder under this Agreement, with respect to any of the Shares. 
 3. Agreement to Vote Shares. Until the Expiration Date, at every meeting of stockholders of Sipex called with respect to any of the following, and
at every adjournment or postponement thereof, and on every action or approval by written consent of stockholders of Sipex with respect to any of the following, the Stockholder shall, or shall cause the holder of record on any applicable record date
to, to the extent not voted by the person(s) appointed under the Proxy (as defined in Section 4 hereof), vote the Shares: 
  

 -2- 

 (a) in favor of adoption of the Merger Agreement and any action required in furtherance thereof;

 (b) against approval of any proposal made in opposition to, or in competition with, consummation of the Merger and the transactions
contemplated by the Merger Agreement; and 
 (c) against any Sipex Acquisition Proposal. 
 Until the Expiration Date, in the event that any meeting of the stockholders of Sipex is held with respect to any of the foregoing (and at every
adjournment or postponement thereof), the Stockholder shall, or shall cause the holder of record of Shares on any applicable record date to, appear at such meeting or otherwise cause his, her or its Shares to be counted as present thereat for
purposes of establishing a quorum. 
 4. Irrevocable Proxy. Concurrently with the execution of this Agreement, the Stockholder agrees
to deliver to Exar a proxy in the form attached hereto as Exhibit A (the “Proxy”), which shall be irrevocable to the fullest extent permissible by applicable law, with respect to the Shares. 
 5. No Ownership Interest. Nothing contained in this Agreement shall be deemed to vest in Exar any direct or indirect ownership or incidence of
ownership of or with respect to any Shares. All rights, ownership and economic benefits of and relating to the Shares shall remain vested in and belong to the Stockholder, and Exar shall have no authority to exercise any power or authority to direct
the Stockholder in the voting of any of the Shares, except as otherwise specifically provided herein, or in the performance of the Stockholder’s duties or responsibilities as stockholders of Sipex . 
 6. No Solicitation. The Stockholder hereby represents and warrants that he or she has read Section 5.4 of the Merger Agreement and
agrees to be bound by the provisions of such section. 
 7. Representations and Warranties of the Stockholder. The Stockholder hereby
represents and warrants to Exar that, as of the date hereof and at all times until the Expiration Date: 
 (a) the Stockholder is (and, except
to the extent a Transfer is made pursuant to the proviso in Section 2(a), will be) the beneficial owner of the shares of capital stock of Sipex, and the options, warrants and other rights to purchase shares of capital stock of Sipex, set
forth on signature page of this Agreement, with full power to vote or direct the voting of the Shares for and on behalf of all beneficial owners of the Shares; 
 (b) the Shares are (and will be) free and clear of any liens, pledges, security interests, claims, options, rights of first refusal, co-sale rights, charges or other encumbrances of any kind or nature (each an
“Encumbrance”) (other than restrictions on transfer imposed by applicable securities laws); 
 (c) the Stockholder does not
as of the date of this Agreement beneficially own any securities of Sipex other than the shares of capital stock of Sipex, and options, warrants and other rights to purchase shares of capital stock of Sipex, set forth on the signature page of this
Agreement; 
  

 -3- 

 (d) the Stockholder has (and will have) full power and authority to make, enter into and carry out the
terms of this Agreement and the Proxy; 
 (e) the Stockholder agrees that it will not bring, commence, institute, maintain, prosecute,
participate in or voluntarily aid any action, claim, suit or cause of action, in law or in equity, in any court or before any Governmental Entity, which alleges that the execution and delivery of this Agreement by the Stockholder, either alone or
together with the other Sipex Voting Agreements and proxies to be delivered in connection with the execution of the Merger Agreement, or the approval of the Merger Agreement by the Board of Directors of Sipex, breaches any fiduciary duty of the
Board of Directors of Sipex or any member thereof; 
 (f) the execution, delivery and performance of this Agreement by the Stockholder does
not, and the consummation by the Stockholder of the transactions contemplated hereby will not, result in a violation or breach of, or constitute (with or without due notice or lapse of time or both) a default (or give rise to any right of
termination, cancellation, modification or acceleration) (whether after the giving of notice of or the passage of time or both) under any Contract to which the Stockholder is a party or which is binding on it, him or her or its, his or her assets
and will not result in the creation of any Encumbrance on any of the assets or properties of the Stockholder (other than the Shares), except for such violations, breaches, defaults, terminations, cancellations, modifications, accelerations or
Encumbrances as would not reasonably be expected to prevent or materially delay the performance by the Stockholder of any of its obligations under this Agreement; 
 (g) this Agreement has been duly executed by the Stockholder and constitutes the valid and legally binding obligation of the Stockholder, enforceable against the Stockholder in accordance with its terms, except as
enforceability may be limited by bankruptcy and other similar laws and general principles of equity; and 
 (h) other than filings under the
Exchange Act and other than such as, if not made, obtained or given, would not reasonably be expected to prevent or materially delay the performance by Stockholder of any of its obligations under this Agreement, no notices, reports or other filings
are required to be made by the Stockholder with, nor are any consents, registrations, approvals, permits or authorizations required to be obtained by the Stockholder from, any Governmental Entity or any other Person, in connection with the execution
and delivery of this Agreement by the Stockholder. 
 8. Consent. The Stockholder consents and authorizes Exar and Sipex to publish
and disclose in the Proxy Statement (including all documents filed with the SEC in connection therewith) its identity and ownership of the Shares and the nature of its commitments, arrangements and understandings under this Agreement. 
 9. Legending of Shares. If so requested by Exar, the Stockholder hereby agrees that the Shares shall bear a legend stating that they are subject
to this Agreement and to an irrevocable proxy. 
 10. Termination. This Agreement shall terminate and be of no further force or effect
as of the Expiration Date. 
 11. Miscellaneous. 
  

 -4- 

 (a) Waiver. No waiver by any party hereto of any condition or any breach of any term or provision
set forth in this Agreement shall be effective unless in writing and signed by the party waiving such condition or breach. The waiver of a condition or any breach of any term or provision of this Agreement shall not operate as or be construed to be
a waiver of any other previous or subsequent breach of any term or provision of this Agreement. Any such waiver shall not be applicable or have any effect except in the specific instance in which it is given. 
 (b) Severability. In the event that any provision of this Agreement or the application thereof, becomes or is declared by a court of competent
jurisdiction to be illegal, void or unenforceable, the remainder of this Agreement will continue in full force and effect and the application of such provision to other Persons or circumstances will be interpreted so as reasonably to effect the
intent of the parties hereto. The parties further agree to replace such void or unenforceable provision of this Agreement with a valid and enforceable provision that will achieve, to the extent possible, the economic, business and other purposes of
such void or unenforceable provision. 
 (c) Binding Effect; Assignment. The Stockholder may not assign this Agreement or any of its
rights, interests, or obligations hereunder without the prior written approval of Exar, and any attempted assignment without such prior written approval shall be void. Subject to the preceding sentence, this Agreement shall be binding upon and shall
inure to the benefit of the parties hereto and their respective successors and permitted assigns. 
 (d) Amendments. This Agreement
may not be modified, amended, altered or supplemented, except upon the execution and delivery of a written agreement executed by each of the parties hereto. 
 (e) Specific Performance; Injunctive Relief. Except as otherwise provided herein, any and all remedies herein expressly conferred upon a party will be deemed cumulative with and not exclusive of any other
remedy conferred hereby, or by law or equity upon such party, and the exercise by a party of any one remedy will not preclude the exercise of any other remedy. The parties hereto agree that irreparable damage would occur to Exar in the event that
any of the provisions of this Agreement were not performed by the Stockholder in accordance with their specific terms or were otherwise breached. It is accordingly agreed that Exar shall be entitled to seek an injunction or injunctions to prevent
breaches of this Agreement by the Stockholder and to enforce specifically the terms and provisions hereof in any court of the United States or any state having jurisdiction, this being in addition to any other remedy to which they are entitled at
law or in equity. 
 (f) Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of
Delaware, regardless of the laws that might otherwise govern under applicable principles of conflicts of law thereof. 
 (g) Waiver of
Jury Trial. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER BASED ON CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE ACTIONS OF
EXAR OR THE STOCKHOLDER IN THE NEGOTIATION, ADMINISTRATION, PERFORMANCE AND ENFORCEMENT HEREOF. 
  

 -5- 

 (h) Entire Agreement. This Agreement and the Proxy (a) constitute the entire agreement among
the parties with respect to the subject matter hereof and supersede all prior agreements and understandings, both written and oral, among the parties with respect to the subject matter hereof, and (b) are not intended to confer upon any other
Person any rights or remedies hereunder. 
 (i) Notices. All notices and other communications pursuant to this Agreement shall be in
writing and deemed to be sufficient if contained in a written instrument and shall be deemed given if delivered personally, telecopied, sent by nationally-recognized overnight courier or mailed by registered or certified mail (return receipt
requested), postage prepaid, to the respective parties at the following address (or at such other address for a party as shall be specified by like notice): 
 if to Exar, to: 
 Exar Corporation 
 48720 Kato Road
 Fremont, CA 94538 
 Attention: Thomas Melendrez 
 Fax No.: (510) 668-7002 
 with copies to 
 O’Melveny & Myers LLP 
 2765 Sand Hill Road 
 Menlo Park, CA 94025 
 Attention: Warren Lazarow/Steve Sonne 
 Fax No.: (650) 473-2601 
 If to the Stockholder: To the address for notice set forth on the signature page hereof. 
 (j) Further Assurances. The Stockholder (in his or her capacity as such) shall execute and deliver any additional certificate, instruments and
other documents, and take any additional actions, as Exar may deem necessary or desirable, in the reasonable opinion of Exar, to carry out and effectuate the purpose and intent of this Agreement. 
 (k) Headings. The section headings set forth in this Agreement are for convenience of reference only and shall not affect the construction or
interpretation of this Agreement in any manner. 
 (l) Counterparts. This Agreement may be executed in one or more counterparts, all
of which shall be considered one and the same agreement and shall become effective when one or more counterparts have been signed by each of the parties and delivered to the other party, it being understood that all parties need not sign the same
counterpart. 
  

 -6- 

 (m) Rules of Construction. The parties hereto agree that they have been represented by counsel
during the negotiation and execution of this Agreement and, therefore, waive the application of any law, regulation, holding or rule of construction providing that ambiguities in an agreement or other document will be construed against the party
drafting such agreement or document. 
 (n) Expenses. All costs and expenses incurred in connection with this Agreement shall be paid
by the party incurring such cost or expense. 
 (o) Stockholder Capacity. To the extent that the Stockholder is an officer or director
of Sipex or any of its Subsidiaries, nothing in this Agreement shall be construed as preventing or otherwise affecting any actions taken by the Stockholder in his or her capacity as an officer or director of Sipex or any of its Subsidiaries or from
fulfilling the obligations of such office (including the performance of obligations required by the fiduciary duties of the Stockholder acting solely in his or her capacity as an officer or director), including, without limitation, participating in
any such capacity in any discussions or negotiations in accordance with Section 5.4 of the Merger Agreement. 
  

 -7- 

 IN WITNESS WHEREOF, the undersigned have caused this Agreement to be duly executed as of the date first
written above. 
  

	
	EXAR CORPORATION
	
	 By:                                      
                                

	        Signature of Authorized Signatory
	
	 Name:                                     
                            

	
	 Title:                                     
                              

 *****SIPEX VOTING AGREEMENT***** 

			
	 STOCKHOLDER:

		
	 By:
	 	  

		 	Signature

			
		
	 Name:
	 	  

			
		
	 Title:
	 	  

			
	
	  

	
	  

	 Print Address

	
	  

	 Telephone
	 	
	
	  

	 Facsimile No.

	
	 Shares beneficially owned:

	
	              shares of Sipex capital stock

	
	             shares of Sipex capital stock issuable upon the exercise of outstanding options, warrants or other
rights

 *****SIPEX VOTING AGREEMENT***** 

 EXHIBIT A 
 IRREVOCABLE PROXY 
 The undersigned stockholder of Sipex Corporation, a Delaware corporation
(“Sipex”), hereby irrevocably (to the fullest extent permitted by law) appoints Thomas R. Melendrez and Richard L. Leza, and each of them, as the sole and exclusive attorneys-in-fact and proxies of the undersigned, with full power
of substitution and resubstitution, to vote and exercise all voting and related rights (to the full extent that the undersigned is entitled to do so) with respect to all of the shares of capital stock of Sipex that now are or hereafter may be
beneficially owned by the undersigned, and any and all other shares or securities of Sipex issued or issuable in respect thereof on or after the date hereof (collectively, the “Shares”) in accordance with the terms of this
irrevocable proxy (the “Proxy”). The Shares beneficially owned by the undersigned stockholder of Sipex as of the date of this Proxy are listed on the final page of this Proxy. Upon the execution of this Proxy by the undersigned, any
and all prior proxies given by the undersigned with respect to any Shares are hereby revoked and the undersigned hereby agrees not to grant any subsequent proxies with respect to the Shares until after the Expiration Date (as defined below).

 This Proxy is irrevocable (to the fullest extent permitted by law), is coupled with an interest and is granted pursuant to that certain
Voting Agreement of even date herewith by and between Exar Corporation, a Delaware corporation (“Exar” ), and the undersigned stockholder (the “Voting Agreement”), and is granted in consideration of Exar entering
into that certain Agreement and Plan of Merger (the “Merger Agreement”), by and among Exar, Side Acquisition Corp., a Delaware corporation and a wholly owned subsidiary of Exar (“Merger Sub”), and Sipex, which
provides for the merger of Merger Sub with and into Sipex in accordance with its terms (the “Merger”). As used herein, the term “Expiration Date” shall mean the earlier to occur of (i) such date and time as the
Merger Agreement shall have been validly terminated pursuant to its terms, or (ii) such date and time as the Merger shall become effective in accordance with the terms and conditions set forth in the Merger Agreement. 
 The attorneys and proxies named above, and each of them, are hereby authorized and empowered by the undersigned, at any time prior to the Expiration
Date, to act as the undersigned’s attorney and proxy to vote the Shares, and to exercise all voting, consent and similar rights of the undersigned with respect to the Shares (including, without limitation, the power to execute and deliver
written consents) at every annual, special, adjourned or postponed meeting of stockholders of Sipex and in every written consent in lieu of such meeting: 
 (i) in favor of adoption of the Merger Agreement and any action required in furtherance thereof; 
 (ii)
against approval of any proposal made in opposition to, or in competition with, consummation of the Merger and the transactions contemplated by the Merger Agreement; and 
 (iii) against any Sipex Acquisition Proposal. 

 The attorneys-in-fact and proxies named above may not exercise this Proxy on any other matter except as
provided above. 
 Any obligation of the undersigned hereunder shall be binding upon the successors and assigns of the undersigned.

  

 This Proxy is irrevocable (to the fullest extent permitted by law). This Proxy shall terminate, and be of
no further force and effect, automatically upon the Expiration Date. 
 Dated:
                         , 2007 

			
	 Signature of Stockholder:
	 	  

		
	 Print Name of Stockholder:
	 	  

		
	 Shares beneficially owned:
	 	
	
	                                  shares of Sipex capital
stock

	
	                                  shares of Sipex capital stock

                issuable upon the exercise of
outstanding
                 options, warrants or other rights

  
  
 *****IRREVOCABLE PROXY *****

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