SUNNYVALE, CA--(MARKET WIRE)--Jul 8, 2008 -- Supertex, Inc. (NasdaqGS:SUPX - News) plans to announce financial results for its fiscal 2009 first quarter ended June 28, 2008 after the market close on July 22, 2008.

The Company will host a conference call at 2:30 p.m. PDT (5:30 p.m. EDT) on July 22, 2008, following the earnings release. Dr. Henry C. Pao, President and Chief Executive Officer, will present an overview of the first fiscal quarter results, discuss current business conditions, and then respond to questions.

The call is available live for any interested party by dialing 800-862-9098 (domestic) or 785-424-1051 (toll, international) before the scheduled start time and requesting to be connected to the Supertex earnings call. A recorded replay will be available immediately after the conference call ends by calling 800-388-6197 (domestic) and 402-220-1115 (toll, international) until August 20, 2008.

About Supertex

Supertex, Inc. is a publicly held mixed signal semiconductor manufacturer, focused on high voltage analog and mixed signal products for use in the medical, imaging, automotive, industrial, telecommunication, networking, and consumer electronics industries. Supertex product, corporate and financial information is readily available at www.supertex.com.

     Corporate Headquarters:
     Dr. Henry C. Pao
     President & CEO
     408/222-8888