This part is a kind of semiconductor called 4NM65-U2.

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-U2 Preliminary 4.0A, 650V N-CHANNEL SUPER-JUNCTION MOSFET  DESCRIPTION The UTC 4NM65-U2 is a Super Junction MOSFET Structure and is designed to have better characteristics, such as fast switching time, low gate charge, low on-state resistance and high rugged avalanche characteristics. This power MOSFET is usually used in high speed switching applications at power supplies, PWM motor controls, high efficient DC to DC converters and bridge circuits.  FEATURES * RDS(ON) < 1.95Ω @ VGS =10V, ID = 2.0 A * Fast Switching Capability * Improved dv/dt Capability, High Ruggedness  SYMBOL Power MOSFET  ORDERING INFORMATION Ordering Number Lead Free Halogen Free 4NM65L-TF1-T 4NM65G-TF1-T 4NM65L-TM3-T 4NM65G-TM3-T 4NM65L-TN3-R 4NM65G-TN3- [ ... ]

4NM65-U2 PDF Datasheet Download