Business Editors

SANTA CLARA, Calif. & GEORGE TOWN, Grand Cayman--(BUSINESS WIRE)--April 16, 2004--O2Micro(R) International Limited (Nasdaq:OIIM), a leading supplier of innovative power management and security ICs to manufacturers of computers, LCD products, mobile communications and information appliances, will announce its financial results for the quarter ended March 31, 2004 after the market closes on Wednesday, May 5, 2004.

The press release will be followed by a conference call at 2:00 p.m. Pacific standard time, 5:00 p.m. Eastern standard time. You may participate by dialing 800-915-4836 or 973-317-5319 (for International participants), no passcode required. A replay of the call will be available by phone until May 11th by dialing 800-428-6051 or 973-709-2089 (for International participants), passcode #349247. 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 designs, develops and markets innovative power management and security components for computers, LCD products, mobile communications and information appliances. Products include Intelligent Lighting, Battery Charger and Management, DC/DC Converter, SmartCardBus(R) and 4-in-1 MemoryCardBus(TM) ICs.

O2Micro International maintains an extensive portfolio of intellectual property with 1488 patent claims granted, and over 5000 more pending. The company maintains offices worldwide. Additional company and product information can be found on the company website at www.o2micro.com.

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.

Note: In "O2Micro," the 2 should read as subscript.

--30--

CONTACT: O2Micro

Gil Goodrich, 408-987-5920 x8013

gil.goodrich@o2micro.com