This part is a kind of semiconductor called 5M0165R.

Function of this product has KA5M0165R.

Manufacturers : Fairchild

Image and pinout :

Some of the text within the PDF file :

www.fairchildsemi.com KA5x0165Rxx-SERIES KA5H0165R/RN, KA5M0165R/RN, KA5L0165R/RN, KA5H0165RVN Fairchild Power Switch(FPS) Features • • • • • • • • • Precision Fixed Operating Frequency (100/67/50kHz ) Low Start-up Current (Typ. 100uA) Pulse by Pulse Current Limiting Over Load Protection Over Voltage Protection (Min. 25V) - except KA5H0165RVN Internal Thermal Shutdown Function Under Voltage Lockout Internal High Voltage Sense FET Auto-Restart Mode Description The Fairchild Power Switch(FPS) product family is specially designed for an off-line SMPS with minimal external components. The Fairchild Power Switch(FPS) consist of high voltage power SenseFET and current mode PWM IC. Included PWM controller features integrated fixed oscillator, under voltag [ ... ]

5M0165R PDF Datasheet Download