This part is a kind of semiconductor called 2SK3043.

Function of this product has Silicon N-Channel Power F-MOS FET.

Manufacturers : Panasonic Semiconductor

Image and pinout :

Some of the text within the PDF file :

Power F-MOS FETs 2SK3043 Silicon N-Channel Power F-MOS FET s Features q Avalanche energy capacity guaranteed: EAS > 100mJ q VGSS = ±30V guaranteed q High-speed switching: tf = 35ns q No secondary breakdown unit: mm 9.9±0.3 4.6±0.2 2.9±0.2 s Applications q Contactless relay q Diving circuit for a solenoid q Driving circuit for a motor q Control equipment q Switching power supply 15.0±0.5 φ3.2±0.1 13.7±0.2 4.2±0.2 1.4±0.2 1.6±0.2 0.8±0.1 3.0±0.5 2.6±0.1 0.55±0.15 s Absolute Maximum Ratings (TC = 25°C) Parameter Drain to Source breakdown voltage Gate to Source voltage Drain current DC Pulse Symbol VDSS VGSS ID IDP EAS* PD Tch Tstg Ratings 450 ±30 ±5 ±10 100 35 2 150 −55 to +150 Unit V V A A mJ W °C °C 1 2 2.54±0.3 3 5.08±0.5 1: Gate 2: Drain 3: Source TO-2 [ ... ]

2SK3043 PDF Datasheet Download