This part is a kind of semiconductor called FB11N50A.

Function of this product has IRFB11N50A.

Manufacturers : International Rectifier

Image and pinout :

Some of the text within the PDF file :

PD- 91809B SMPS MOSFET IRFB11N50A HEXFET® Power MOSFET Applications l Switch Mode Power Supply ( SMPS ) l Uninterruptable Power Supply l High speed power switching Benefits l Low Gate Charge Qg results in Simple Drive Requirement l Improved Gate, Avalanche and dynamic dv/dt Ruggedness l Fully Characterized Capacitance and Avalanche Voltage and Current VDSS 500V Rds(on) max 0.52Ω ID 11A TO-220AB G D S Absolute Maximum Ratings Parameter ID @ TC = 25°C ID @ TC = 100°C IDM PD @TC = 25°C VGS dv/dt TJ TSTG Continuous Drain Current, VGS @ 10V Continuous Drain Current, VGS @ 10V Pulsed Drain Current  Power Dissipation Linear Derating Factor Gate-to-Source Voltage Peak Diode Recovery dv/dt ƒ Operating Junction and Storage Temperature Range Soldering Temperatur [ ... ]

FB11N50A PDF Datasheet Download