This part is a kind of semiconductor called CQ1265RT.

Function of this product has FSCQ1265RT.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

FSCQ-Series Green Mode Fairchild Power Switch (FPS™) February 2006 FSCQ-Series FSCQ0565RT/FSCQ0765RT/FSCQ0965RT/FSCQ1265RT/ FSCQ1465RT/FSCQ1565RT/FSCQ1565RP Green Mode Fairchild Power Switch (FPS™) Features ■ Optimized for Quasi-Resonant Converter (QRC) ■ Advanced Burst-Mode Operation for under 1W Description A Quasi-Resonant Converter (QRC) typically shows lower EMI and higher power conversion efficiency compared to conventional hard-switched converter with a fixed switching frequency. Therefore, a QRC is well suited for noise-sensitive applications, such as color TV and audio. Each product in the FSCQ-Series contains an integrated Pulse Width Modulation (PWM) controller and a SenseFET, and is specifically designed for quasiresonant off-line Switch Mode P [ ... ]

CQ1265RT PDF Datasheet Download