SigmaTel Launches New Software Development Kit for STMP3600 Portable Media SoC

New SDK 4.201 Offers PlaysForSure(TM) 1.2 Support for WMDRM10 and Ability to Store and Playback WMDRM10 Content from Removable Media

AUSTIN, Texas--March 9, 2006--SigmaTel, Inc. (NASDAQ:SGTL), a leader in mixed-signal multimedia semiconductors, today launched its new Software Development Kit (SDK) 4.201 for its fourth-generation System on Chip portable multimedia player solution, the STMP3600. The SigmaTel SDK 4.201 provides customers with a more robust software development environment offering Microsoft(R) PlaysForSure(TM) version 1.2 support for Windows(R) Media (WM) DRM10.

"The STMP3600 delivers the highest level of performance with the greatest degree of integration on the market and the new SDK 4.201 provides designers with the necessary tools to develop devices that offer increased functionality," said Michael Wodopian, senior vice president, Portable System on Chip Group at SigmaTel. "SigmaTel continues to offer its customers innovative hardware and software solutions that allow them to stay competitive in today's consumer electronics market and support industry specifications like Microsoft's PlaysForSure."

The SigmaTel SDK 4.201 for the STMP3600 offers designers and manufacturers the following features and benefits:

• Microsoft(R) PlaysForSure version 1.2 support for WMDRM10 content
• Ability to store and playback WMDRM10 content from removable media (SD and MMC cards)
• Audio playback with simultaneous JPEG decoding for slideshows  and wallpaper
• Standard interface support to add product differentiating features, including Bluetooth functionality
• WMA encode capability
• Industry leading power consumption - up to 70 hours battery life

In  addition to low overall system bill of materials offered through the STMP3600's industry leading integration, future iterations of the STMP3600 SDK will provide support for the Microsoft(R) PlaysForSure version 2.0 specification, required of all MP3 players seeking the PlaysForSure logo certification after July 2006, as well as support for multi-format video decode functionality (H.264, MPEG4 ASP, and VC1).

SigmaTel's portable multimedia SoC solutions, including the STMP3600, provide high quality audio playback for portable devices such as MP3 players, language learners, and jukeboxes. Through patented semiconductor and software solutions, SigmaTel's product integration and support allows customers to develop multimedia devices with the longest battery life, smallest form factors and lowest system design costs in the market.

The company's portable multimedia solutions offer market-leading benefits, including as much as a 30% lower bill of material costs, Hi-Speed USB 2.0, up to 70 hours of battery life on a single AA battery and reduction in PCB area through integration enabling the industry's most innovative form factors. With flexible software support and upgrade options, SigmaTel solutions offer support for MP3, Windows Media Audio, and OGG Vorbis. Additionally, SigmaTel SoCs support the widest range of NAND Flash solutions on the market, including large block SLC and large block MLC Flash.

Availability:

The new SDK 4.2 was made available in limited distribution to SigmaTel STMP3600 beta customers in early January 2006. SDK 4.201 for all other customers is currently available.
For more information on SigmaTel products, 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 digital multimedia products in the consumer electronics and computing markets, including portable compressed audio players, such as MP3 players, notebook and desktop PCs, digital video cameras, multi-function peripheral products, 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.