This part is a kind of semiconductor called IRFB260N.

Function of this product has Power MOSFET(Vdss=200V/ Rds(on)max=0.040ohm/ Id=56A).

Manufacturers : International Rectifier

Image and pinout :

Some of the text within the PDF file :

PD - 94270 SMPS MOSFET IRFB260N HEXFET® Power MOSFET l Applications High frequency DC-DC converters VDSS 200V RDS(on) max 0.040Ω ID 56A Benefits Low Gate-to-Drain Charge to Reduce Switching Losses l Fully Characterized Capacitance Including Effective COSS to Simplify Design, (See App. Note AN1001) l Fully Characterized Avalanche Voltage and Current l TO-220AB 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 Temperature, for 10 seconds Mounting torqe, 6-32 or M3 screw Max. 56 40 [ ... ]

IRFB260N PDF Datasheet Download