-- Standard output up to 65 watts per channel -- Low distortion and noise -- Efficiency greater than 85%

IRVINE, Calif.--(BUSINESS WIRE)--Sept. 20, 2001--
Microsemi Corp. (Nasdaq:MSCC - news), a leading manufacturer of power
management integrated circuits, today announced that it has introduced
two new AudioMAX® Class-D stereo amplifier controllers with
next-generation power and performance characteristics.

Designated the LX1721/1722(TM) controllers, the new integrated
circuits support full fidelity 20Hz-20kHz audio production and a
standard output up to 65 watts (rms) per channel. Output power is
determined by the choice of input voltage, external MOSFETs and
speaker loads. The single input supply can be as low as seven volts,
or as high as 25 volts.

With efficiency greater than 85% the new AudioMAX controllers
remain cool, requiring no heat sinks in most applications that range
from portable or battery-operated products to automotive amplifiers,
multi-channel multimedia computer and video games, wireless speakers,
home theatre/surround sound audio, computers and public address
systems.

``These newest AudioMAX controllers typify the space and
power-saving objectives common to most Microsemi product introductions
today,'' commented Kelly Jones, vice president and general manager at
Microsemi's power management division. ``In addition to power and
efficiency advantages, the LX1721/1722 solutions provide impressive
sound quality. Their typical distortion plus noise rating is less than
0.06%,'' he said.

There are two controllers in the new AudioMAX series. The LX1721
is optimized for fidelity, uses a power supply of seven to 15 volts,
and provides stereo output power up to 40 watts per channel. The
LX1722 is optimized for power, providing stereo output up to 65 watts
from a 25 volt supply. AudioMAX reference designs also show how it is
possible to achieve an even greater output, with power exceeding well
over 100 watts per channel.

Microsemi designers point out that creating a complete stereo
amplifier is easy -- accomplished by combining an LX1721/22 controller
with appropriate output power MOSFETs and an output filter. Microsemi
offers two ready-to-play evaluation modules -- the LXE1721 and LXE1722
-- that require only a power source, speakers and input audio signals
to test drive the new AudioMAX full-fidelity sound reproduction.

Reference designs are available for multi-channel systems,
subwoofers, satellite/subwoofer combinations and speaker loads from
two to eight ohms, allowing easy control of frequency response,
efficiency, performance, component count and circuit board size.

``These two new controllers represent the high end audio portion of
our strategy to provide the broadest combination of light, sound and
power solutions for designers of mobile and multi-media products,''
said Manuel Lynch, Microsemi vice president of business development.
``Combined with our ultra-low power Class-D hearing aid chips and a
line of medium power mobile phone amplifiers in development, Microsemi
is positioning itself as the premier source for space and power-saving
audio solutions.''

The LX1721/22 controllers are supplied in 44-pin QSOP surface
mount packages. Their 10K-piece unit price is $4.33. Immediate
sampling and volume production is available. For detailed sales and
pricing information call 800/713-4113.

Complete technical information including thermal data, functional
pin descriptions, electrical characteristics, block diagram and
application notes is available on the Microsemi Audio Products Web
site, www.microsemi.com/sound.

About Microsemi

Microsemi is a leading designer, manufacturer and marketer of
analog, mixed-signal and discrete semiconductors. The company's
semiconductors manage and regulate power, protect against transient
voltage spikes and transmit, receive and amplify signals.

Microsemi products include individual components as well as
complete circuit solutions that enhance customer designs by providing
battery optimization, reducing size or protecting circuits. Markets
the company serves include mobile connectivity, computer/peripherals,
telecommunications, medical, industrial/commercial, space/satellite
and military.

More information may be obtained by contacting the company
directly or by visiting its Web site at http://www.microsemi.com.

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Reform Act of 1995: Any statements set forth in the news release that
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integrating new operations or assets, rapidly changing technology and
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and fluctuations in market prices of the company's common stock,
difficulties in implementing company strategies, environmental
matters, litigation, difficulties protecting proprietary rights, and
inventory obsolescence. In addition to these factors and any other
factors mentioned elsewhere in this news release, the reader should
refer as well to the factors, uncertainties and risks identified in
the company's most recent Form 10-K filed on Dec. 21, 2000, and
the final prospectus on Form S-3 filed on June 1, 2000, by the company
with the Securities and Exchange Commission. The company does not
undertake to supplement or correct any information in this release
that is or becomes incorrect.

     Microsemi Corp., Irvine
     David R. Sonksen,(Investor Inquiries), 949/221-7101
     or
     Cliff Silver, (Editorial), 949/221-7112