This part is a kind of semiconductor called 2SK724.
Function of this product has N-CHANNEL SILICON POWER MOSFET.
Manufacturers : Fuji Electric
Image and pinout :

Some of the text within the PDF file :
2SK724 N-CHANNEL SILICON POWER MOSFET FUJI POWER MOSFET F- I SERIES Outline Drawings TO-3P Features High speed switching Low on-resistance No secondary breakdown Low driving power High voltage Applications Switching regulators UPS (Uninterruptible Power Supply) DC-DC converters General purpose power amplifier 3. Source JEDEC EIAJ SC-65 Maximum ratings and characteristics Absolute maximum ratings ( Tc=25°C unless otherwise specified) Item Drain-source voltage Continuous drain current Pulsed drain current Continuous reverse drain current Gate-source peak voltage Max. power dissipation Operating and storage temperature range Symbol V DS ID ID(puls] IDR VGS PD Tch Tstg Rating 500 10 40 10 ±20 100 +150 -55 to +150 Unit V A A A V W °C °C Equivalent circuit schematic Drain(D) Gate(G) [ ... ]
2SK724 PDF Datasheet Download
