This part is a kind of semiconductor called KSE350.

Function of this product has High Voltage General Purpose Applications.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

KSE350 KSE350 High Voltage General Purpose Applications • High Collector-Emitter Breakdown Voltage • Suitable for Transformer • Complement to KSE340 1 TO-126 2.Collector 3.Base 1. Emitter PNP Epitaxial Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol VCBO VCEO VEBO IC PC TJ TSTG Parameter Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current Collector Dissipation (TC=25°C) Junction Temperature Storage Temperature Value - 300 - 300 -5 - 500 20 150 - 65 ~ 150 Units V V V mA W °C °C Electrical Characteristics TC=25°C unless otherwise noted Symbol BVCEO ICBO IEBO hFE Parameter Collector-Emitter Breakdown Voltage Collector Cut-off Current Emitter Cut-off Current DC Current Gain Test Condition IC = - 1mA, IB = 0 [ ... ]

KSE350 PDF Datasheet Download