This part is a kind of semiconductor called 16N50.
Function of this product has N-CHANNEL POWER MOSFET.
Manufacturers : Unisonic Technologies
Image and pinout :
Some of the text within the PDF file :
UNISONIC TECHNOLOGIES CO., LTD 16N50 Preliminary Power MOSFET 16 Amps, 500 Volts N-CHANNEL POWER MOSFET DESCRIPTION The UTC 16N50 is an N-channel mode power MOSFET using UTC’s advanced technology to provide customers with planar stripe and DMOS technology. This technology allows a minimum on-state resistance and superior switching performance. It also can withstand high energy pulse in the avalanche and commutation mode. The UTC 16N50 is generally applied in high efficiency switch mode power supplies, active power factor correction and electronic lamp ballasts based on half bridge topology. 1 TO-220F FEATURES * 16A, 500V, RDS(ON)=0.38Ω @ VGS=10V * High Switching Speed * 100% Avalanche Tested SYMBOL 2.Drain 1.Gate 3.Source ORDERING INFORMATION Package TO-220F 1 [ ... ]