This part is a kind of semiconductor called 4N65-C.

Function of this product has N-CHANNEL POWER MOSFET.

Manufacturers : Unisonic Technologies

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Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 4N65-C 4A, 650V N-CHANNEL POWER MOSFET  DESCRIPTION The UTC 4N65-C is a high voltage power 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) < 3.0Ω @ VGS = 10 V, ID = 2A * Fast Switching Capability * Avalanche Energy Specified * Improved dv/dt Capability, High Ruggedness  SYMBOL Power MOSFET  ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package 4N65L-TF1-T 4N65G-TF1-T TO-220F1 Note: Pin Assignment: G: Gate D: Drain S [ ... ]

4N65-C PDF Datasheet Download