Oak Technology
http://www.oaktech.com
video processors, storage controllers (CD-ROM), MPEG chips, audio chips

Oasis Semiconductor
http://www.oasissemi.com
digital scanner chips

Offete Enterprises
http://www.dnai.com/~jfox/p21.html#p21
specialty microprocessor

OKI Semiconductor
http://www.okisemi.com
http://www.oki-europe.de
RF chips, telecom chips, speech chips, microcontrollers, microprocessors, display drivers, DRAM, ROM

Omnirel
http://www.omnirel.com
transistors (FETs), voltage regulators, schottky diodes, rectifiers, op amps

OmniVision
http://www.ovt.com
CMOS image sensor chips

Omron
http://www.omron.com
controller chips

Optek Technology
http://www.optekinc.com
optoelectronics

OPTI
http://www.opti.com
PC system chipsets, sound chips, video chips

Opto Diode
http://www.optodiode.com
IR diodes

Optotek
http://www.optotek.com
LEDs, LED driver chips

Orbit Semiconductor
http://www.orbitsemi.com
gate arrays (PLA)

Oren Semiconductor
http://www.oren.com
video chips, digital TV chips

Orologic
http://www.oro-logic.com
networking ASICs

Osicom Technologies
http://www.osicom.com
network communications controller chip

Oxford Micro Devices
http://www.oxfordmicrodevices.com
DSP chips

Oxford Semiconductor
http://www.oxsemi.com
UART, communications controller