This part is a kind of semiconductor called MDF12N50F.
Function of this product has N-Channel MOSFET.
Manufacturers : MagnaChip
Image and pinout :
Some of the text within the PDF file :
MDP12N50F/MDF12N50F N-channel MOSFET 500V MDP12N50F/MDF12N50F N-Channel MOSFET 500V, 11.5A, 0.7Ω General Description These N-channel MOSFET are produced using advanced MagnaChip’s MOSFET Technology, which provides low onstate resistance, high switching performance and excellent quality. These devices are suitable device for SMPS, high Speed switching and general purpose applications. Features VDS = 500V ID = 11.5A RDS(ON) ≤ 0.7Ω @ VGS = 10V @ VGS = 10V Applications Power Supply PFC High Current, High Speed Switching D TO-220 MDP Series TO-220F MDF Series Absolute Maximum Ratings (Ta = 25oC) Characteristics Drain-Source Voltage Gate-Source Voltage Continuous Drain Current Pulsed Drain Current(1) Power Dissipation Repetitive Avalanche Energy(1) Peak [ ... ]