This part is a kind of semiconductor called SMK0825D2.
Function of this product has Advanced N-Ch Power MOSFET.
Manufacturers : KODENSHI KOREA
Image and pinout :

Some of the text within the PDF file :
SMK0825D2 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.) 100% avalanche tested RoHS compliant device Ordering Information Part Number Marking Package SMK0825D2 SMK0825 D2-PAK D GS D2-PAK Marking Information AUK GFYMDD SMK0825 Column 1: Manufacturer Column 2: Production Information e.g.) GFYMDD -. G: Option Code (H: Halogen Free) -. F: Factory Management Code -. YMDD: Date Code (Year, Month, Date) Column 3: Device Code Absolute maximum ratings (TC=25C unless otherwise noted) Characteristic Symbol Drain-source voltage Repetitive Avalanche Voltage (Note 1, 2) Gate-source voltage Drain current (DC) * Drain current [ ... ]
SMK0825D2 PDF Datasheet Download
