This part is a kind of semiconductor called BU5027AF.

Function of this product has Bipolar Junction Transistor.

Manufacturers : Jingdao

Image and pinout :

Some of the text within the PDF file :

R www.jdsemi.cn 深圳市晶导电子有限公司 ShenZhen Jingdao Electronic Co.,Ltd. BU5027AF Bipolar Junction Transistor ◆Si NPN ◆RoHS COMPLIANT 1．APPLICATION Computer aided power and Switch-mode power supplies 2．FEATURES High voltage capability Features of good high temperature High switching speed 3．PACKAGE TO-220F 4．Electrical Characteristics 4.1 Absolute Maximum Ratings 1 23 1 Base(B) 2 Collector(C) 3 Emitter(E) Tamb= 25℃ unless specified PARAMETER SYMBOL VALUE UNIT Collector-Base Voltage Collector-Emittor Voltage Emittor- Base Voltage Collector Current Power Dissipation Ta=25℃ Tc=25℃ Junction Temperature Storage Temperature 4.2 Electrical Parameter Tamb= 25℃ unless specified PARAMETER SYMBOL Collector-Base Voltage Collector-Emittor Voltage [ ... ]

BU5027AF PDF Datasheet Download