Press Release

Source: O2Micro International Limited

On Monday June 29, 2009, 8:30 am EDT

GEORGE TOWN, Grand Cayman--(BUSINESS WIRE)--O2Micro® International Limited (NASDAQ :OIIM) (SEHK:0457 - News), a leading supplier of innovative power management and security components, will announce its financial results for the second quarter ended June 30, 2009 before the market opens on Wednesday, July 29, 2009.

The press release will be followed by a conference call at 5:00 a.m. PDT, 8:00 a.m. EDT, and 8:00 p.m. Hong Kong time. You may participate using the following dial-in information.

In the US and CANADA: 888-219-1412, pass code #9224276

In HONG KONG: 800-965-503, pass code #9224276

Other INTERNATIONAL participants: 913-312-1412, pass code #9224276

A replay of the call will be available by phone until August 5th using the following dial-in information.

In the US and CANADA: 888-203-1112, pass code #9224276

In HONG KONG: 800-901-108, pass code #9224276

Other INTERNATIONAL participants: 719-457-0820, pass code #9224276

A live simulcast will also be available on the company website at www.o2micro.com, and an online replay will be available on the website for one week.

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.

Contact:

O2MicroGary E. Abbott, 408-987-5920 ext. 8888Director of Investor Relationsgary.abbott@o2micro.com