This part is a kind of semiconductor called MDF11N65B.

Function of this product has N-Channel MOSFET.

Manufacturers : MagnaChip

Image and pinout :

Some of the text within the PDF file :

MDF11N65B N-channel MOSFET 650V MDF11N65B N-Channel MOSFET 650V, 12A, 0.65Ω 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 = 650V ID = 12A RDS(ON) ≤ 0.65Ω @ VGS = 10V @ VGS = 10V Applications Power Supply PFC High Current, High Speed Switching D TO-220F MDF Series G 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 Diode Recovery dv/dt(3) Single Pulse Avalanche Energy(4) Ju [ ... ]

MDF11N65B PDF Datasheet Download