This part is a kind of semiconductor called 28N50F.

Function of this product has FDA28N50F.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

FDA28N50F N-Channel MOSFET January 2012 FDA28N50F N-Channel MOSFET 500V, 28A, 0.175Ω Features • RDS(on) = 0.140Ω ( Typ.)@ VGS = 10V, ID = 14A • Low Gate Charge ( Typ. 80nC) • Low Crss ( Typ. 38pF) • Fast Switching • 100% Avalanche Tested • Improved dv/dt Capability • RoHS Compliant UniFET TM Description These N-Channel enhancement mode power field effect transistors are produced using Fairchild’s proprietary, planar stripe, DMOS technology. This advance technology has been especially tailored to minimize on-state resistance, provide superior switching performance, and withstand high energy pulse in the avalanche and commutation mode. These device are well suited for high efficient switched mode power supplies and active power factor correction. D G G DS TO-3PN S M [ ... ]

28N50F PDF Datasheet Download