This part is a kind of semiconductor called 13N50.

Function of this product has N-CHANNEL POWER MOSFET.

Manufacturers : Unisonic Technologies

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Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 13N50 Preliminary Power MOSFET 500V N-CHANNEL MOSFET „ DESCRIPTION 1 TO-220 The UTC 13N50 is an N-Channel enhancement mode power MOSFET. The device adopts planar stripe and uses DMOS technology to minimize and provide lower on-state resistance and faster switching speed. It can also withstand high energy pulse under the avalanche and commutation mode conditions. The UTC 13N50 is ideally suitable for high efficiency switch mode power supply, power factor correction, electronic lamp ballast based on half bridge topology. 1 TO-220F „ FEATURES * RDS(ON) =0.48Ω @VGS = 10 V * Ultra low gate charge (typical 43 nC ) * Low reverse transfer Capacitance ( CRSS = typical 20pF ) * Fast switching capability * Avalanche energy tested * Improved dv/dt capability, [ ... ]

13N50 PDF Datasheet Download