This part is a kind of semiconductor called MDF9N60B.

Function of this product has N-Channel Trench MOSFET.

Manufacturers : MagnaChip

Image and pinout :

Some of the text within the PDF file :

MDF9N60B N-channel MOSFET 600V MDF9N60B N-Channel MOSFET 600V, 9A, 0.80Ω 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 = 9.0A RDS(ON) ≤ 0.80Ω @ VGS = 10V @ VGS = 10V Applications Power Supply PFC High Current, High Speed Switching G DS 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 Diode Recovery dv/dt(3) Single Pulse Avalanche Energy(4) Junction and Storage Tem [ ... ]

MDF9N60B PDF Datasheet Download