SigmaTel GoChip USB Mass Storage Products Now Support Renesas Technology's AG-AND and Toshiba Corp's MLC Flash Memory.

AUSTIN, Texas -- SigmaTel, Inc. (NASDAQ:SGTL), a leader in analog intensive, mixed-signal integrated circuits, introduces its STBD2011 GoChip(TM) USB Flash Drive Controller with support for low cost multi-level cell (MLC) NAND and AG-AND flash memory technology. The STBD2011 is the newest in the family of GoChip Mass Storage Products and is pin compatible with the STBD2010 GoChip USB Flash Drive Controller.

GoChip USB Flash Drive Controllers provide a complete system solution for implementing USB flash drive designs and now include support for Renesas Technology's MLC AG-AND and Toshiba Corp's MLC NAND flash, providing substantial improvements in storage density and system cost. By storing multiple bits of information in a single memory cell, MLC flash provides more capacity in a similar silicon area when compared with Single Level Cell (SLC, one bit per cell) technology and therefore supports lower system costs. SigmaTel's GoChip products implement hardware error correction circuitry (ECC), improving the reliability of data stored in MLC flash without sacrificing performance. The growing popularity of storage-hungry applications, such as USB flash (thumb) drives, has created a demand for flash memory with larger capacities.

"Our GoChip(TM) customers asked for MLC and AG-AND support to help reach lower system price points," said Andrew Lambrecht, director of marketing for the Integrated Components Group at SigmaTel. "They see MLC flash technology as a way to increase bit density without increasing system costs."

"SigmaTel's support for Renesas AG-AND flash technology products provide the cost and density benefits offered by MLC, while offering improved performance over standard SLC NAND flash," said Haruji Ishihara, department manager, memory product marketing dept. and manager of worldwide memory product marketing of Renesas Technology Corp.

"SigmaTel's GoChip, with support for MLC flash technology, now enables USB designers to achieve better cost-performance," said Brian Kumagai, business development manager, NAND Flash, for Toshiba America Electronic Components, Inc. "In a recent study of MLC NAND Flash performance based on typical files sizes for Microsoft Office documents, Toshiba found that the MLC NAND Flash performance is more than sufficient to satisfy today's consumer and business users of USB Flash Drives."

SigmaTel offers complete design packages and promises quick time to market for its valued customers. The STBD2011 is currently available in sample quantities for $1.70.

For more information on SigmaTel products, as well as development information and sales support please visit www.sigmatel.com.

About SigmaTel:

SigmaTel Inc., a fabless semiconductor company headquartered in Austin, Texas, 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. We provide our customers complete, system-level solutions that include highly-integrated ICs, customizable firmware and software, software development tools, reference designs and applications support. Our focus on providing system-level solutions enables our 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 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 and July 20, 2004 and the Form 10-K that was filed on February 17, 2004.

GoChip is a trademark and SigmaTel is a registered trademark of SigmaTel, Inc. All other products and brand names as they appear in this release are trademarks or registered trademarks of their respective holders. All specifications may be changed without notice.