Exhibit 99.1

Atiq Raza Joins AMI Semiconductor's Board of Directors

    POCATELLO, Idaho--(BUSINESS WIRE)--April 30, 2004--AMIS Holdings
Inc. (Nasdaq:AMIS), parent company of AMI Semiconductor, a leading
designer and manufacturer of state-of-the-art, integrated mixed-signal
and structured digital products for the automotive, medical and
industrial sectors, announced that Atiq Raza has joined its board of
directors. Raza is founder, chairman and chief executive officer of
Raza Microelectronics Inc.
    "I am delighted that Atiq Raza has joined our board of directors,"
said Chris King, president and CEO of AMIS. "Atiq brings a broad
background and a deep understanding of the semiconductor industry to
our board. His wealth of management and engineering experience,
technological knowledge and strategic focus will be of great value to
AMIS."
    Raza has worked in various engineering and management positions
for the last 32 years. Prior to founding Raza Microelectronics, he was
the president and chief operating officer of Advanced Micro Devices
(AMD), as well as serving on its board of directors. Raza became part
of AMD's management team after the merger with NexGen Inc. in January
1996. At NexGen, he was the chairman and chief executive officer.
Before joining NexGen, Raza held various engineering and management
positions within VLSI Technology Incorporated, including vice
president, Technology Centers.
    Raza earned his bachelor's degree with honors from the University
of London and a master's degree from Stanford University.
    AMIS also announced that Tomohiro Shibata has resigned from its
board of directors. Shibata is a senior counselor for Nippon Mining
Holdings Inc., a significant stockholder in AMIS. He had served on the
board since August 2002. "I want to thank Mr. Shibata for his
contributions to the company," said Chris King. "His advice and
counsel were valuable as we moved our business forward over the last
two years."

    About AMI Semiconductor

    AMI Semiconductor (AMIS) is a leader in the design and manufacture
of silicon solutions for the real world. As a widely recognized
innovator in state-of-the-art integrated mixed-signal products,
mixed-signal foundry services and structured digital products, AMIS is
committed to providing customers with the optimal value, quickest
time-to-market semiconductor solutions. Offering unparalleled
manufacturing flexibility and dedication to customer service, AMI
Semiconductor operates globally with headquarters in Pocatello, Idaho,
European corporate offices in Oudenaarde, Belgium, and a network of
sales and design centers located in the key markets of the United
States, Europe and the Asia Pacific region.

    CONTACT: AMI Semiconductor, Pocatello
             Investor Relations:
             Jimmie Hutchens, 208-234-6732
             Jimmie_hutchens@amis.com
              or
             Media:
             Helen Garrett
             hgarrett@sheltongroup.com