This part is a kind of semiconductor called 5N50-P.

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 5N50-P 5A, 500V N-CHANNEL POWER MOSFET  DESCRIPTION The UTC 5N50-P is an N-channel power MOSFET adopting UTC’s advanced technology to provide customers with DMOS, planar stripe technology. This technology is designed to meet the requirements of the minimum on-state resistance and perfect switching performance. It also can withstand high energy pulse in the avalanche and communication mode. The UTC 5N50-P can be used in applications, such as active power factor correction, high efficiency switched mode power supplies, electronic lamp ballasts based on half bridge topology.  FEATURES * RDS(ON) < 1.6Ω @VGS = 10 V, ID = 2.5 A * 100% avalanche tested * High switching speed  SYMBOL Power MOSFET  ORDERING INFORMATION Ordering Number Lead Free Ha [ ... ]

5N50-P PDF Datasheet Download