Catalyst Semiconductor Buck LED Driver Named to EDN's Hot 100 Products of 2007.

CAT4201, 7W Buck LED Driver Named One of Nine Products in "Power Semiconductors and ICs" Category

SANTA CLARA, Calif. -- Catalyst Semiconductor, Inc. (NASDAQ:CATS) a supplier of analog, mixed-signal and non-volatile memory semiconductors announced that its CAT4201, 7W buck LED driver has been named to the EDN Magazine's list of Hot 100 Products of 2007. The CAT4201 was selected one of nine hot products in the "Power Semiconductors and ICs" category, which includes leading analog semiconductor suppliers.

Designed for use in high-power household, commercial and automotive lighting products, the CAT4201 buck LED driver provides a significantly smaller and far more power-efficient "green" alternative to linear regulators, which, traditionally have been used to control high-brightness lighting applications.

"Catalyst is honored to have our CAT4201 7W buck LED driver selected by EDN as one of its 2007 Hot 100 Products," said Scott Brown, vice president of marketing for Catalyst Semiconductor. "EDN reviews hundreds of products every year and we are very pleased to have the first product in our new family of buck LED drivers to be chosen by their editors."

Products selected for the EDN annual Hot 100 Products list are chosen by its editors from the hundreds of newsworthy items that appear in the pages of EDN in print or online. Eligible products must have appeared in EDN magazine during the year.

EDN Editorial Director Maury Wright stated, "Our editorial team covers new product introductions on a daily basis and we see a lot of worthy products. We look back once a year and choose the introductions that we believe will have the greatest significance to the design engineer and create the Hot 100 list."

About the CAT4201 LED Driver

The first device in a new family of buck converters, the CAT4201 is optimized for driving high-brightness, 350mA LEDs at up to 94 percent efficiency. The device incorporates Catalyst's patent-pending switching control scheme, which reduces system complexity and improves efficiency by providing better inductor control and eliminating the need for a dedicated heat sink. Traditionally, LEDs from 12V or 24V buses have been driven by linear regulators, which generate a significant amount of heat, resulting in the need for a dedicated heat sink and, therefore, a very large TO263 package. The patented architecture and small package size (TSOT-23) of the CAT4201 offer a simpler and significantly smaller alternative to linear regulators in high-power LED lighting applications.

About EDN and EDN.com

EDN serves the vital information needs of design engineers and engineering managers worldwide. EDN.com delivers a three-dimensional view of the electronics industry via news coverage, strategic business information, and in-depth technical content. (www.edn.com). EDN is published by Reed Business Information (www.reedbusiness.com/us), the largest business-to-business publisher in the U.S. and a member of the Reed Elsevier Group plc (NYSE: RUK and ENL) - a world-leading publisher and information provider operating in the science and medical, legal, education and business-to-business industry sectors.

About Catalyst Semiconductor

Headquartered in Santa Clara, California, Catalyst Semiconductor designs and markets analog, mixed-signal and non-volatile memory products, including Digitally Programmable Potentiometers (DPP[TM]), white and color LED drivers, DC/DC converters, LDO regulators, voltage supervisors, bus expanders, serial and parallel EEPROMs, Flash and NVRAM. Many of Catalyst's products incorporate the Company's Quantum Charge Programmable[TM] technology, to deliver Adaptive Analog[TM] products, which offer a new level of customer flexibility, lower power and smaller die size. Catalyst products are used in telecommunications, computer, automotive, industrial and consumer markets. Typical applications include LCD displays, automotive lighting, optical networks, printers, modems, wireless LANs, network cards, DIMM modules, cellular telephones, navigation systems, set-top boxes and Internet routers. www.catsemi.com.

Forward Looking Statements

This press release contains some forward-looking statements, which are subject to risks and uncertainties. These forward-looking statements include references by third parties to performance and commercial viability of Catalyst's products. Additional information about factors that could cause actual results to differ materially from those in the forward-looking statements is contained in Catalyst's SEC reports including, but not limited to, Catalyst's Annual Report filed on Form 10-K and Quarterly Reports filed on Form 10-Q. Catalyst disclaims any obligation to update information contained in any forward-looking statement.

Editor Notes:

1) Trademark notices: Adaptive Analog[TM], DPP[TM] and Quantum Charge Programmable[TM] are trademarks of Catalyst Semiconductor, Inc.