MICROSEMI Corporation to acquire ZARLINK SEMICONDUCTOR Inc.

ALISO VIEJO, CALIFORNIA and OTTAWA, ONTARIO -- 09/22/11 - Microsemi Corporation (NASDAQ: MSCC), a leading provider of semiconductor solutions differentiated by power, security, reliability and performance, and Zarlink Semiconductor Inc. (TSX: ZL), a leading provider of mixed-signal chip technologies for a broad range of communications and medical applications, announced today that they have entered into a Support Agreement pursuant to which Microsemi, through a wholly-owned subsidiary (the "Offeror"), will amend its existing offers to increase the price offered for all of the issued and outstanding common shares (the "Shares") and 6% unsecured, subordinated convertible debentures maturing September 30, 2012 (the "Debentures") of Zarlink by 19% to CAD$3.98 in cash per Share and CAD$1,624.49 in cash per CAD$1,000 principal amount of Debentures plus accrued and unpaid interest to the date Debentures are taken up (the "Amended Offers").

The Board of Directors of Zarlink, after receiving fairness opinions from its financial advisors, RBC Capital Markets and Canaccord Genuity Corp, has unanimously determined that the Offers are fair to its Shareholders and Debentureholders, that it is in the best interests of the Company to support and facilitate the Offers, and has approved the Offers and recommends that Zarlink Shareholders and Debentureholders tender their Shares and Debentures to the Amended Offers.

The total transaction value is approximately US $525 million, net of Zarlink's cash which is currently US $ 107M. The Amended Offers represent a 67% premium over the closing price of the Shares on the TSX and a 48% premium over the closing price of the Debentures on the TSX on July 19, 2011, the day prior to the initial public announcement of Microsemi's proposal to acquire Zarlink. The consideration under the Amended Offers represents a 15% premium to the closing price on the TSX of the Shares and a 15% premium to the closing price on the TSX of the Debentures on September 21, 2011, the last trading day prior to this announcement.

"We are excited to add Zarlink to the Microsemi family and to enter into this transaction on a friendly basis," said James J. Peterson, Microsemi's president and chief executive officer. "Entering the process and performing diligence enabled us to confirm the compelling strategic fit between the two companies. Furthermore, Zarlink's fundamentals, technology capabilities, product roadmap and revenue growth opportunities exceeded our expectations. By bringing Microsemi's scale and discipline to this tremendous property, we expect to deliver outstanding results for our shareholders."

Adam Chowaniec, Chairman of Zarlink's Board of Directors, stated, "After careful consideration of strategic alternatives, protracted negotiations and the receipt of two fairness opinions from our financial advisors, the Zarlink Board of Directors unanimously recommends that Shareholders and Debentureholders tender their Shares and Debentures to the Amended Offers from Microsemi."

Microsemi believes the transaction will be immediately accretive to non-GAAP EPS before synergies. Based on current assumptions, Microsemi expects the acquisition to be $0.24 to $0.26 accretive to non-GAAP EPS in its first full fiscal year ending 2012. More details will follow upon completion of the acquisition.

For the September quarter, net sales for Microsemi are expected to increase from 3% to 5% sequentially. As of this date, Microsemi remains comfortable with its previously announced non-GAAP diluted earnings per share guidance for its fourth Fiscal quarter 2011 of $0.52 to $0.54.

About Microsemi

Microsemi Corporation (NASDAQ: MSCC) offers a comprehensive portfolio of semiconductor solutions for: aerospace, defense and security; enterprise and communications; and industrial and alternative energy markets. Products include high-performance, high-reliability analog and RF devices, mixed-signal and RF integrated circuits, customizable SoCs, FPGAs, and complete subsystems. Microsemi is headquartered in Aliso Viejo, Calif., and has more than 2,700 employees globally. Learn more at http://www.microsemi.com/.

About Zarlink

Zarlink Semiconductor (TSX: ZL) delivers world-leading, mixed-signal chip technologies for a broad range of communication and medical applications. Zarlink's core capabilities include timing solutions that manage time-sensitive communication applications over wireless and wired networks, line circuits supporting high-quality voice services over cable and broadband connections, and ultra low-power radios enabling new wireless medical devices and therapies. Serving the world's largest original equipment manufacturers, Zarlink's highly integrated chip solutions help customers simplify design, lower costs and reach market quickly. For more information, visit http://www.zarlink.com/.

"Forward-Looking" and "Safe-Harbor" Statements are omitted