SigmaTel to Participate in Thomas Weisel Partners Technology Conferenc

    Business Editors/High-Tech Writers

    AUSTIN, Texas--(BUSINESS WIRE)--Feb. 1, 2005--SigmaTel, Inc., (NASDAQ:SGTL) today announced that Michael Wodopian, Senior Vice President of SigmaTel's SoC business, will participate in the Thomas Weisel Partners Technology 2005 Conference at the Fairmont Hotel in San Francisco. Mr. Wodopian's discussion on February 7 at 3:15 PM Pacific Time will be webcast at www.sigmatel.com/investor.relations. Replays of the presentation will be available 24 hours after the live event and will be available for 30 days.

    About SigmaTel

    SigmaTel is a fabless semiconductor company that designs, develops, and markets proprietary, analog intensive, mixed-signal ICs for a variety of products in the consumer electronics and computing markets, including portable compressed audio players, such as MP3 players, notebook and desktop PCs, DVD players, digital televisions, and set-top boxes. SigmaTel provides complete, system-level solutions that include highly-integrated ICs, customizable firmware and software, software development tools, reference designs, and applications support. The Company's focus is on providing system-level solutions that enable customers to rapidly introduce and offer electronic products that are small, light-weight, power-efficient, reliable, and cost-effective. SigmaTel is ISO 9001:2000 certified and is committed to providing customers with high performance, quality products along with superior customer service.

    Cautionary Language

    This press release contains forward-looking statements based on current SigmaTel expectations. The words "expect," "will," "should," "would," "anticipate," "project," "outlook," "believe," "intend," and similar phrases as they relate to SigmaTel or future events are intended to identify such forward-looking statements. These forward-looking statements reflect the current views and assumptions of SigmaTel, but are subject to various risks and uncertainties that could cause actual results to differ materially from expectations. A number of important factors could cause actual results to differ materially from those in the forward-looking statements, and there will be events in the future that SigmaTel is not able to accurately predict or control. For a discussion of these and other factors that could impact SigmaTel's financial results and cause actual results to differ materially from those in the forward-looking statements, please refer to recent SigmaTel filings with the SEC, particularly the 424(b)(4) final prospectuses filed September 19, 2003 and February 19, 2004, the Form 10-Qs that were filed on October 29, 2003, April 20, 2004, July 20, 2004 and October 19, 2004, the Form 10-K that was filed on February 17, 2004, and the Form 10-K that SigmaTel anticipates filing during February of 2005 covering the annual period ended December 31, 2004.

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CONTACT: SigmaTel, Inc., Austin Press Contact: Nate Long, 512-381-3913 nlong@sigmatel.com or Investor Relations: 512-381-3931 investor.relations@sigmatel.com http://www.sigmatel.com/investor.relations

KEYWORD: CALIFORNIA TEXAS INDUSTRY KEYWORD: HARDWARE COMPUTERS/ELECTRONICS BANKING MUSIC SOFTWARE TRADESHOW CONFERENCE CALLS SOURCE: SigmaTel, Inc.

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