This part is a kind of semiconductor called TSF5N60M.
Function of this product has 600V N-Channel MOSFET.
Manufacturers : Truesemi
Image and pinout :

Some of the text within the PDF file :
www.DataSheet4U.net TSP5N60M/TSF5N60M 600V N-Channel MOSFET Features ■ 4.5A,600v,RDS(on)=2.2Ω@VGS=10V ■ Gate charge (Typical 17nC) ■ High ruggedness ■ Fast switching ■ 100% AvalancheTested ■ Improved dv/dt capability General Description This Power MOSFET is produced using Truesemi’s advanced planar stripe, DMOS technology.This latest technology has been especially designed to minimize on-state resistance, have a high rugged avalanche characteristics, such as fast switching time,low on resistance.low gate charge and especially excellent avalanche characteristics. This power MOSFET is usually used at AC adaptors, on the battery charger and SMPS Absolute Maximum Ratings Symbol VDSS ID Drain to Source Voltage Continuous Drain Current(@TC = 25°C) Continuous Drain Current(@TC [ ... ]
TSF5N60M PDF Datasheet Download
