Microsemi and O2Micro Settle Litigation

November 6, 2007. Microsemi Corporation (NASDAQ®: MSCC), a leading manufacturer of analog and mixed signal integrated circuits and high reliability semiconductors, and O2Micro® International Limited (NASDAQ®: OIIM; SEHK: 0457), a leading supplier of innovative power management and security components and systems, jointly announced today that they have reached a settlement covering the current patent litigation pending between the two companies before the United States District Court for the Eastern District of Texas Marshall Division. As part of the settlement, the parties will dismiss all claims against each other and enter covenants not to sue each other and each other's direct and indirect customers on O2Micro's U.S. Patent Nos. 6,259,615, 6,396,722 and 6,804,129 and on Microsemi's U.S Patent Nos. 5,615,093, 5,923,129, 5,930,121, 6,198,234 and 6,870,330 for four years.

The litigation between O2Micro and Microsemi was part of the O2Micro International Limited v. Rohm Co., Ltd., et al, and O2Micro International Limited v. Microsemi Corporation litigation matters. O2Micro's patent infringement claims against Rohm, which do not involve Microsemi or Microsemi's products, currently remain in that case.

About Microsemi Corporation

Microsemi, with corporate headquarters in Irvine, California, is a leading designer, manufacturer and marketer of high performance analog and mixed signal integrated circuits and high reliability semiconductors. The Company's semiconductors manage and control or regulate power, protect against transient voltage spikes and transmit, receive, and amplify signals.

Microsemi's products include individual components as well as integrated circuit solutions that enhance customer designs by improving performance and reliability, optimizing battery performance, reducing size or protecting circuits. The principal markets the company serves include defense, commercial air, satellite, medical, notebook computers, LCD TVs, mobile, and connectivity applications. More information may be obtained by contacting the company directly or by visiting its web site at http://www.microsemi.com.

About O2Micro

Founded in April 1995, O2Micro develops and markets innovative power management, and security components and systems for the Computer, Consumer, Industrial, and Communications markets. Products include Intelligent Lighting, Battery Management, Power Management, SmartCardBus® and Security products, such as VPN/Firewall system solutions.

O2Micro International maintains an extensive portfolio of intellectual property with 8,167 patent claims granted, and over 9,000 more pending. The company maintains offices worldwide. Additional company and product information can be found on the company website at www.o2micro.com.

O2Micro, the O2Micro logo, SmartCardBus, and combinations thereof are registered trademarks of O2Micro. All other trademarks are the property of their respective owners.

Microsemi Contact Information
Financial Contact:
David R. Sonksen
Executive Vice President and CFO
Phone: 949.221.7101

Contact Information:
Mitchell Benus
Director of Investor Relations, O2Micro
Phone: 408.332.1749
Email: mitchell.benus@o2micro.com

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