This part is a kind of semiconductor called 4NM65.

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 4NM65 Preliminary 4.0A, 650V N-CHANNEL SUPER-JUNCTION MOSFET  DESCRIPTION The UTC 4NM65 is a Super Junction MOSFET, designed to have better characteristics, such as fast switching time, low gate charge, low on-state resistance and have a high rugged avalanche characteristic. This power MOSFET is usually used in high speed switching applications including power supplies, PWM motor controls, high efficient DC to DC converters and bridge circuits.  FEATURES * RDS(ON) <1.4Ω @ VGS = 10 V, ID = 2.0 A * Fast Switching Capability * Avalanche Energy Specified * Improved dv/dt Capability, High Ruggedness  SYMBOL Power MOSFET 11 TO-251 TO-220F 1 TO-220F1 1 TO-251S 1 TO-252  ORDERING INFORMATION Ordering Number Lead Free Halogen Free 4NM65L [ ... ]

4NM65 PDF Datasheet Download