SigmaTel Offers VFIR Infrared Companion Chip for Portable Devices Such as MP3 Players and Mobile Handsets.

AUSTIN, Texas -- SigmaTel, Inc. (NASDAQ:SGTL), a leader in analog-intensive mixed-signal integrated circuits, announces the availability of the STIR4230 Very Fast Infrared (VFIR) companion chip providing 16 million bit per second wireless communication to SigmaTel-based portable MP3 player designs and other portable device and embedded applications. With initial applications targeted for implementation within SigmaTel STMP35xx MP3 player solutions, the STIR4230 will also be available for non-music applications including cell phones, digital still cameras, in-store kiosks and printers.

"SigmaTel is continuing to build upon its core technologies to bring to market products that will provide portable applications with wireless transfer methods for large files such as digital music and photos," says Phil Pompa, vice president of the Integrated Products Group at SigmaTel. "This latest offering expands the company's range and allows our customers to easily implement wireless, secure functionality within their devices."

"The STIR4230 differs from previous SigmaTel IrDA devices in that it is designed for use in portable and other embedded applications and not only as a PC peripheral," Pompa says. "The product, with VFIR speeds, is the ideal method of transferring digital music and photos between portable devices."

As one of the fastest wireless transfer methods, VFIR can transfer a single 3 Mbyte file in approximately 2 seconds or 100 Mbytes of information in under 1.5 minutes. As a point-to-point communications method, it is one of the most secure wireless technologies and is virtually immune to wireless hacking common with RF wireless technologies. Through SigmaTel's integration and design expertise, the VFIR implementation with the STIR4230 enables both low power consumption and a lower design cost and is offered in a design solution that is quickly and easily implemented within a variety of applications.

Ron Brown, Executive Director of the Infrared Data Association states, "as the market leader for portable digital audio players, SigmaTel's new companion infrared solution will enable large file transfers at very fast speeds. The IrDA brought the Very Fast Infrared (VFIR) standards into the marketplace for applications just like this."

The STIR4230 provides IrDA (Infrared Data Association) compatible protocol processing for all IrDA data rates from SIR (Serial Infrared) to VFIR including MIR (Medium Infrared) and FIR (Fast Infrared). The STIR4230 interfaces to the host process via a simple Serial Peripheral Interconnect (SPI). The 4mm by 4mm QFN package and low power consumption make the STIR4230 an attractive part for mobile applications. The STIR4231 is a pin compatible part that supports IrDA rates up to FIR (4 million bits per second).

A demonstration of device-to-device VFIR implementation as well as new customer MP3 products offering this feature will be showcased at the Computex Tradeshow in Taipei, Taiwan, May 31-June 4. Please contact SigmaTel Sales at [e-mail] if you wish to schedule a meeting at this event.

The STIR4230 is currently sampling and is available for $5.95 in quantities of 1k including IrDA protocol software running on STMP35xx MP3 decoders.

For more information on SigmaTel solutions, 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. 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.

Infrared Data Association (www.irda.org):

IrDA is an International Organization dedicated to creating global, interoperable, secure, low-cost infrared technology specification standards. With over half a billion products shipped, IrDA has maintained its leadership position in commercially viable wireless data transfer technology since 1993. The intellectual property developed by IrDA has also enabled emerging technologies such as Bluetooth, WAP, and 3GPP.

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, July 20, 2004, October 19, 2004, and April 19, 2005, and the Form 10-Ks that were filed on February 17, 2004 and February 8, 2005.

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.