This part is a kind of semiconductor called K3115B.

Function of this product has N-CHANNEL POWER MOS FET.

Manufacturers : Renesas

Image and pinout :

Some of the text within the PDF file :

DATA SHEET MOS FIELD EFFECT TRANSISTOR 2SK3115B SWITCHING N-CHANNEL POWER MOS FET DESCRIPTION The 2SK3115B is N-Channel MOS FET device that features a low gate charge and excellent switching characteristics, and designed for high voltage applications such as switching power supply, AC adapter. ORDERING INFORMATION PART NUMBER PACKAGE 2SK3115B-S17-AY Note Isolated TO-220 Note Pb-free (This product does not contain Pb in External electrode.) FEATURES • Low gate charge QG = 21 nC TYP. (VDD = 450 V, VGS = 10 V, ID = 6.0 A) • Gate voltage rating : ±30 V • Low on-state resistance RDS(on) = 1.2 Ω MAX. (VGS = 10 V, ID = 3.0 A) • Avalanche capability ratings ABSOLUTE MAXIMUM RATINGS (TA = 25°C) Drain to Source Voltage (VGS = 0 V) Gate to Source Voltage (VDS = 0 V) Drain Current [ ... ]

K3115B PDF Datasheet Download