This part is a kind of semiconductor called 3S0765R.

Function of this product has KA3S0765R.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com KA3S0765R/KA3S0765RF Fairchild Power Switch(SPS) Features • • • • • • • • • Wide operatimg frequency range up to (150kHz) Pulse by pulse over current limiting Over load protection Over voltage protecton (Min. 23V) Internal thermal shutdown function Under voltage lockout Internal high voltage sense FET External sync terminal Auto Restart Mode Description The SPS product family is specially designed for an offline SMPS with minimal external components. The SPS consist of high voltage power SenseFET and current mode PWM IC. Included control IC features a trimmed oscillator, under voltage lock-out, leading edge blanking, optimized gate turnon/turn-off driver, thermal shut down protection, over voltage protection, temperature compen [ ... ]

3S0765R PDF Datasheet Download