Estek Electronics Co. Ltd
Quad operational amplifiers
Philips Electronics
Low power quad op amps
Samsung
Quad Low Power OP AMP
HTC Korea
QUAD OPERATIONAL AMPLIFIERS
Contek Microelectronics
Quad Operatioal Amplifier Pinouts
ON Semiconductor
Single Supply Quad Operational Amplifiers
Cadeka Microcircuits LLC.
Low Power, 3V to 36V, Single/Dual/Quad Amplifers
Fairchild Semiconductor
Quad Operational Amplifier