This part is a kind of semiconductor called 2SK3634.

Function of this product has MOS Field Effect Transistor.

Manufacturers : Guangdong Kexin Industrial

Image and pinout :

Some of the text within the PDF file :

SMD Type IC MOSFET MOS Field Effect Transistor 2SK3634 TO-252 Unit: mm +0.1 2.30-0.1 +0.8 0.50-0.7 Features High voltage: VDSS = 200 V Gate voltage rating: RDS(on) = 0.60 30 V +0.2 9.70-0.2 +0.15 1.50-0.15 +0.15 6.50-0.15 +0.2 5.30-0.2 +0.1 0.80-0.1 Built-in gate protection diode 2.3 +0.15 4.60-0.15 +0.1 0.60-0.1 +0.28 1.50-0.1 +0.25 2.65-0.1 Low Ciss: Ciss = 270 pF TYP. (VDS = 10 V, VGS = 0 V) +0.15 0.50-0.15 MAX. (VGS = 10 V, ID = 3.0 A) 0.127 max +0.15 5.55-0.15 1 Gate 2 Drain 3 Source Absolute Maximum Ratings Ta = 25 Parameter Drain to source voltage Gate to source voltage Drain current Power dissipation TC=25 TA=25 Channel temperature Storage temperature * PW 10 s,Duty Cycle 1% Tch Tstg Symbol VDSS VGSS ID Idp * PD Rating 200 30 6.0 18 20 1.0 150 -5 [ ... ]

2SK3634 PDF Datasheet Download