This part is a kind of semiconductor called K2129.

Function of this product has 2SK2129.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

Power F-MOS FETs 2SK2129 Silicon N-Channel Power F-MOS FET s Features q Avalanche energy capacity guaranteed: EAS > 20mJ q VGSS = ±30V guaranteed q High-speed switching: tf = 50ns q No secondary breakdown unit: mm 4.6±0.2 φ3.2±0.1 9.9±0.3 2.9±0.2 s Applications 4.1±0.2 8.0±0.2 Solder Dip 13.7–0.2 q Contactless relay q Diving circuit for a solenoid q Driving circuit for a motor q Control equipment q Switching power supply 15.0±0.3 3.0±0.2 +0.5 1.2±0.15 1.45±0.15 0.75±0.1 2.54±0.2 5.08±0.4 2.6±0.1 0.7±0.1 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 800 ±30 ±3 ±6 20 50 2 150 −55 to +150 Unit V V A A mJ W ° [ ... ]

K2129 PDF Datasheet Download