Patent for Low Pass Filtering Technique Granted to O2Micro

May 7, 2009. O2Micro® International Limited (NASDAQ®: OIIM; SEHK: 0457), a leading supplier of innovative power management and security components, was issued 21 claims under United States patent number 7,471,016 for its Low Pass Filtering technique.

This patented filtering method can be used in a variety of portable, cordless electrical device and EV/HEV applications. For example, a cordless drill may include a low pass filter to limit high frequency noise, improving the accuracy of cell voltage measurement inside a battery pack.

"This patented methodology gives the end user a more efficient and higher performance low pass filter to economically maximize safety in their applications," commented William Kao, vice president, O2Micro.


About O2Micro

Founded in April 1995, O2Micro develops and markets innovative power management and security components for the Computer, Consumer, Industrial, and Communications markets. Products include Intelligent Lighting, Battery Management, Power Management, and SmartCardBus® products.

O2Micro International maintains an extensive portfolio of intellectual property with 11,830 patent claims granted, and over 14,000 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.

Statements made in this release that are not historical, including statements regarding O2Micro's or management's intentions, hopes, beliefs, expectations, representations, projections, plans or predictions of the future, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements involve risks and uncertainties that may cause actual results to differ materially from those set forth in these statements. Factors that could cause actual results to differ materially include risks and uncertainties such as reduced demand for products of electronic equipment manufacturers which include O2Micro's products due to adverse economic conditions in general or specifically affecting O2Micro's markets, technical difficulties and delays in the developments process, and errors in the products. You are also referred to the Form F-1 in connection with the company's initial public offering in August 2000, Form F-3 in connection with the company's public offering in November 2001, and the annual reports on Form 20-F, which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements. The company assumes no obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise.

Contact Information:
Gary E. Abbott
Director of Investor Relations, O2Micro
Phone: 408.987.5920. x8888
Email: gary.abbott@o2micro.com


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