ULN

USMikroChips

http://www.usmikro.com/

UM

United Microelectronics (UMC)

http://www.umc.com.tw/

UMA

Philips Semiconductor

http://www-eu.semiconductors.philips.com/

UMC

United Microelectronics (UMC)

http://www.umc.com.tw/

UPC

NEC

http://www.ic.nec.co.jp/index_e.html

UPD

NEC

http://www.ic.nec.co.jp/index_e.html

VCA

Burr-Brown

http://www.burr-brown.com/

VFC

Burr-Brown

http://www.burr-brown.com/

W

IC Works

http://www.icworks.com/

W

Winbond

http://www.winbond.com.tw/

WD

Western Digital

http://www.westerndigital.com/

X

Xicor

http://www.xicor.com/

XC

Motorola

http://www.mot-sps.com/

XR

Exar

http://www.exar.com/

XTR

Burr-Brown

http://www.burr-brown.com/

Z

Zilog

http://www.zilog.com/