Published: May 24, 2005

Supertex to Present at the 6th Annual Smith Barney Citigroup Semiconductor Conference

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Supertex, Inc. (NASDAQ: SUPX), a leading supplier of high voltage, mixed signal integrated circuits (ICs), is pleased to announce that President and CEO, Dr. Henry C. Pao, and Executive Vice President, Richard E. Siegel, will be presenting at the 6th Annual Smith Barney Citigroup Semiconductor Conference to be held at the Monterey Plaza Hotel in Monterey, California on June 1-2, 2005.

The Supertex presentation will be webcast live on Wednesday, June 1, 2005 at 1:30 P.M. (PDT). The webcast for the Conference may be accessed by visiting http://www.veracast.com/webcasts/sbcitigroup/sc05/74107235.cfm at the time of the presentation. To view the webcast, viewers will need a multimedia computer (sound card and speakers) that has a web browser, Internet access, and a media player plug-in (Windows Media Player or RealNetworks Real Player). An archive of the presentation will be available for 30 days and can be accessed via a link at http://www.supertex.com/financials.html.

About Supertex

Supertex, Inc. is a publicly held mixed signal semiconductor manufacturer, focused on high voltage interface products for use in the telecommunications, networking systems, flat panel displays, medical and industrial electronics industries. Supertex product, corporate and financial information is readily available at www.supertex.com.