This part is a kind of semiconductor called CS12N65F.

Function of this product has N-Channel MOSFET.

Manufacturers : BLUE ROCKET ELECTRONICS

Image and pinout :

Some of the text within the PDF file :

BRF12N65(CS12N65F) N-Channel MOSFET/N 沟 MOS 晶体管 用途: 用于高频开关电源，电子镇流器，UPS 电源。 Purpose: High efficiency switch mode power supplies, Electronic lamp ballasts based on half bridge, UPS. 特点:低栅极电荷,低反馈电容,开关速度快。 Features: Low gate charge，Low Crss，Fast switching. 极限参数/Absolute maximum ratings(Ta=25℃) 参数符号 数值 单位 Symbol Rating Unit VDSS 650 V ID(Tc=25℃) 12 A ID(Tc=100℃) 7.6 A IDM 48 A VGSS ±30 V EAS 880 mJ EAR 25 mJ IAR 12 A RθJC 2.45 ℃/W RθJA 62.5 ℃/W PD 51 W TJ,TSTG -55 to 150 ℃ 电性能参数/Electrical Characteristics(Ta=25℃) 参数符号 测试条件 Symbol Test Conditions BVDSS VGS=0V ID=250μA IDSS VDS=650V VGS=0V IGSS VGS=±3 [ ... ]

CS12N65F PDF Datasheet Download