4-pin of Fairchild IC,

Discrete Semiconductor Products	Sensors, Transducers	RF/IF and RFID	Isolators	Electronic Components
Transistors - FETs, MOSFETs - Single	Pressure Sensors, Transducers Optical Sensors - Photoelectric, Industrial	RF Amplifiers RF Accessories	Optoisolators - Transistor, Photovoltaic Output Optoisolators - Triac, SCR Output	MICROCHIP IC Fairchild IC Maxim IC

Part Number	Manufacturer / Brand	Brife Description