This part is a kind of semiconductor called 4N80-N.

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 4N80-N 4.0A, 800V N-CHANNEL POWER MOSFET  DESCRIPTION The UTC 4N80-N is a N-channel mode power MOSFET using UTC’s advanced technology to provide costomers planar stripe and DMOS technology. This technology is specialized in allowing a minimum on-state resistance, and superior switching performance. It also can withstand high energy pulse in the avalanche and commutation mode. The UTC 4N80-N is universally applied in high efficiency switch mode power supply.  FEATURES * RDS(on)<3.0Ω @VGS =10V * High switching speed * Improved dv/dt capability * 100% avalanche tested  SYMBOL 2.Drain Power MOSFET 1.Gate 3.Source  ORDERING INFORMATION Note: Ordering Number Lead Free Halogen Free 4N80L-TM3-T 4N80G-TM3-T 4N80L-TN3-R 4N80G-TN3-R Pin Assi [ ... ]

4N80-N PDF Datasheet Download