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

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-E 4A, 650V N-CHANNEL POWER MOSFET  DESCRIPTION The UTC 4N65-E 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) < 2.5Ω @ VGS = 10 V, ID = 2.2A * Fast Switching Capability * Avalanche Energy Specified * Improved dv/dt Capability, High Ruggedness  SYMBOL Power MOSFET www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd 1 of 7 QW-R502-964.E 4N65-E Power MOSFET  ORDERING INFORMATION Ordering Nu [ ... ]

4N65-E PDF Datasheet Download