This part is a kind of semiconductor called SMK0825D.
Function of this product has Advanced N-Ch Power MOSFET.
Manufacturers : KODENSHI KOREA
Image and pinout :

Some of the text within the PDF file :
SMK0825D Advanced N-Ch Power MOSFET SWITCHING REGULATOR APPLICATION Features High voltage: BVDSS=250V (Min.) Low gate charge: Qg=14.5nC (Typ.) Low drain-source On resistance: RDS(on)=0.43Ω (Max.) RoHS compliant device Halogen free package D Ordering Information Part Number SMK0825D Marking SMK0825 Package TO-252 G S TO-252 Marking Information SMK 0825 YWW□ Column 1, 2: Device Code Column 3: Production Information e.g.) YWW□ -. YWW: Date Code (year, week) -. □: Factory Code (‘A’: AUK, ‘S’: SP Semi.) Absolute maximum ratings (TC=25C unless otherwise noted) Characteristic Drain-source voltage Repetitive Avalanche Voltage (Note 1, 2) Gate-source voltage Drain current (DC) * Drain current (Pulsed) * Single pulsed avalanche energy (Note 2) Repetitiv [ ... ]
SMK0825D PDF Datasheet Download
