This part is a kind of semiconductor called 7N80.

Function of this product has 800V N-CHANNEL POWER MOSFET.

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 7N80 Power MOSFET 7A, 800V N-CHANNEL POWER MOSFET 1  DESCRIPTION The UTC 7N80 is an N-channel mode power MOSFET using UTC’s advanced technology to provide customers with planar stripe and DMOS technology. This technology specializes 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 7N80 is universally applied in high efficiency switch mode power supply. TO-220 1 TO-220F1  FEATURES * RDS(on)<1.8Ω@ VGS =10V * High switching speedY * 100% avalanche tested  SYMBOL 2.Drain 1 TO-220F3 1 TO-220F 1 TO-220F2 1 TO-263 1.Gate 3.Source  ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package 7N80L-TA3-T 7N80G-TA3 [ ... ]

7N80 PDF Datasheet Download