This part is a kind of semiconductor called MDF4N60.

Function of this product has N-Channel MOSFET.

Manufacturers : MagnaChip

Image and pinout :

Some of the text within the PDF file :

MDP4N60/MDF4N60 N-channel MOSFET 600V MDP4N60/MDF4N60 N-Channel MOSFET 600V, 4.6A, 2.0Ω 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 = 600V  ID = 4.6A  RDS(ON) ≤ 2.0Ω @ VGS = 10V @ VGS = 10V Applications  Power Supply  PFC  High Current, High Speed Switching D TO-220 MDP Series TO-220F MDF Series G S Absolute Maximum Ratings (Ta = 25oC) Drain-Source Voltage Gate-Source Voltage Characteristics Continuous Drain Current Pulsed Drain Current(1) Power Dissipation Repetitive Avalanche Energy(1) Peak Dio [ ... ]

MDF4N60 PDF Datasheet Download