This part is a kind of semiconductor called 2SK3402.

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 MOS Field Effect Transistor 2SK3402 TO-252 IC MOSFET Unit: mm +0.1 2.30-0.1 +0.8 0.50-0.7 Features Low on-resistance +0.2 9.70-0.2 +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 = 3200 pF TYP. +0.15 0.50-0.15 RDS(on)2 = 22 m MAX. (VGS = 4.0 V, ID = 18A) 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 60 20 36 144 40 1.0 150 -55 to +150 Unit V V A A W Electrical Characteristics Ta = 25 Parameter Symbol IDSS IGSS VGS(off) Yfs R [ ... ]

2SK3402 PDF Datasheet Download