This part is a kind of semiconductor called 52N15D.

Function of this product has IRFB52N15D.

Manufacturers : International Rectifier

Image and pinout :

Some of the text within the PDF file :

PD - 94357A SMPS MOSFET IRFB52N15D IRFS52N15D IRFSL52N15D HEXFET® Power MOSFET Applications l High frequency DC-DC converters VDSS 150V RDS(on) max 0.032Ω ID 60A Benefits l 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 TO-220AB IRFB52N15D D2Pak TO-262 IRFS52N15D IRFSL52N15D Absolute Maximum Ratings ID @ TC = 25°C ID @ TC = 100°C IDM PD @TA = 25°C PD @TC = 25°C VGS dv/dt TJ TSTG Parameter Continuous Drain Current, VGS @ 10V Continuous Drain Current, VGS @ 10V Pulsed Drain Current  Power Dissipation ‡ Power Dissipation Linear Derating Factor Gate-to-Source Voltage Peak Diode Recovery dv/dt ƒ Operating Junction [ ... ]

52N15D PDF Datasheet Download