This part is a kind of semiconductor called KSE13003T.

Function of this product has High Voltage Switch Mode Applications.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

KSE13003T KSE13003T High Voltage Switch Mode Applications • 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 Parameter 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 Value 700 400 9 1.5 3 0.75 30 150 - 65 ~ 150 Units V V V A A A W °C °C Electrical Characteristics TC=25°C unless otherwise noted Symbol BVCEO IEBO hFE VCE(sat) Parameter Collector-Emitter Breakdown Voltage Emitter Cut-off Current *DC Current Gain *Collector Emitter Saturation [ ... ]

KSE13003T PDF Datasheet Download