This part is a kind of semiconductor called KSE13004.

Function of this product has High Voltage Switch Mode Application.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

KSE13004/13005 KSE13004/13005 High Voltage Switch Mode Application • High Speed Switching • Suitable for Switching Regulator and Motor Control 1 TO-220 2.Collector 3.Emitter 1.Base NPN Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol VCBO VCEO VEBO IC ICP IB PC TJ TSTG Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current (DC) Collector Current (Pulse) Base Current Collector Dissipation (TC=25°C) Junction Temperature Storage Temperature Parameter : KSE13004 : KSE13005 : KSE13004 : KSE13005 Value 600 700 300 400 9 4 8 2 75 150 - 65 ~ 150 Units V V V V V A A A W °C °C Electrical Characteristics TC=25°C unless otherwise noted Symbol BVCEO(sus) Parameter Collector-Emitter Sustaining Voltage : KSE13004 : KSE13005 [ ... ]

KSE13004 PDF Datasheet Download