Microsemi and O2 Micro Settle Litigation

Tuesday November 6, 8:45 am ET


IRVINE, Calif. and SANTA CLARA, Calif., Nov. 6, 2007 (PRIME NEWSWIRE) -- Microsemi Corporation (NasdaqGS:MSCC - News), a leading manufacturer of analog and mixed signal integrated circuits and high reliability semiconductors, and O2 Micro International Limited (``O2 Micro'') (NasdaqGS:OIIM - News) (HKSE:0457.HK - News), 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 O2 Micro'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 O2 Micro and Microsemi was part of the O2 Micro International Limited v. Rohm Co., Ltd., et al, and O2 Micro International Limited v. Microsemi Corporation litigation matters. O2 Micro'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.


The Microsemi Corporation logo is available at http://www.primenewswire.com/newsroom/prs/?pkgid=1233


About O2 Micro


Founded in April 1995, O2 Micro 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(r) and Security products, such as VPN/Firewall system solutions.


O2 Micro International maintains an extensive portfolio of intellectual property with over 7,800 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 http://www.o2micro.com.


O2 Micro, the O2 Micro logo, SmartCardBus, and combinations thereof are registered trademarks of O2 Micro. All other trademarks are the property of their respective owners.


Forward Looking Statement:




``Safe Harbor'' Statement under the Private Securities Litigation Reform Act of 1995: Any statements set forth in the news release that are not entirely historical and factual in nature are forward-looking statements. For instance, all statements of belief and all statements about plans or expectations are forward-looking statements. Forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified. The potential risks and uncertainties include, but are not limited to, such factors as changes in generally accepted accounting principles, the difficulties regarding the making of estimates and projections, the hiring and retention of qualified personnel in a competitive labor market, acquiring, managing and integrating new operations, businesses or assets, uncertainty as to the future profitability of acquired businesses, delays in the realization of any accretion from acquisition transactions, any circumstances that adversely impact the end markets of acquired businesses, difficulties in closing or disposing of operations or assets, difficulties in transferring work from one plant to another, rapidly changing technology and product obsolescence, difficulties predicting the timing and amount of plant closure costs, the potential inability to realize cost savings or productivity gains and to improve capacity utilization, potential cost increases, weakness or competitive pricing environment of the marketplace, uncertain demand for and acceptance of the company's products, adverse circumstances in any of our end markets including the challenging conditions in our analog/mixed-signal markets, results of in-process or planned development or marketing and promotional campaigns, changes in demand for products, difficulties foreseeing future demand, effects of limited visibility of future sales, potential non-realization of expected orders or non-realization of backlog, product returns, product liability, and other potential unexpected business and economic conditions or adverse changes in current or expected industry conditions, business disruptions, epidemics, health advisories, disasters, national emergencies, wars or potential future effects of the tragic events of September 11, 2001, variations in customer order preferences, fluctuations in market prices of the company's common stock and potential unavailability of additional capital on favorable terms, difficulties in implementing company strategies, dealing with environmental or other regulatory matters or litigation, or any matters involving litigation, contingent liabilities or other claims, difficulties and costs imposed by law, including under the Sarbanes-Oxley Act of 2002, difficulties in determining the scope of, and procuring and maintaining, adequate insurance coverage, difficulties, and costs, of protecting patents and other proprietary rights, work stoppages, labor issues, inventory obsolescence and difficulties regarding customer qualification of products, manufacturing facilities and processes, and other difficulties managing consolidation or growth, including in the maintenance of internal controls, the implementation of information systems, and the training of personnel. In addition to these factors and any other factors mentioned elsewhere in this news release, the reader should refer as well to the factors, uncertainties or risks identified in the company's most recent Form 10-K and all subsequent Form 10-Q reports filed by Microsemi with the SEC and O2 Micro's most recent Form 20F filed with the SEC. Additional risk factors shall be identified from time to time in Microsemi's and O2 Micro's future filings. Microsemi and O2 Micro do not undertake to supplement or correct any information in this release that is or becomes incorrect.


Investor Inquiries: David R. Sonksen, Microsemi Corporation, Irvine, CA (949) 221-7101.



Microsemi Corporation

Financial Contact:

David R. Sonksen, Executive Vice President and CFO



O2 Micro

Mitchell Benus, Director of Investor Relations





Source: Microsemi Corporation