This part is a kind of semiconductor called 2SK3528-01R.

Function of this product has Super FAP-G Series / N Channel Silicon Power MOSFET.

Manufacturers : Fuji

Image and pinout :

Some of the text within the PDF file :

2SK3528-01R FUJI POWER MOSFET N-CHANNEL SILICON POWER MOSFET Outline Drawings TO-3PF Super FAP-G Series Features High speed switching Low on-resistance No secondary breadown Low driving power Avalanche-proof Applications Switching regulators UPS (Uninterruptible Power Supply) DC-DC converters Maximum ratings and characteristicAbsolute maximum ratings (Tc=25°C unless otherwise specified) Item Drain-source voltage Continuous drain current Pulsed drain current Gate-source voltage Repetitive or non-repetitive Maximum Avalanche Energy Maximum Drain-Source dV/dt Peak Diode Recovery dV/dt Max. power dissipation Operating and storage temperature range Isolation Voltage Symbol V DS VDSX *5 ID ID(puls] VGS IAR *2 EAS *1 dVDS/dt *4 dV/dt *3 PD Ta=25°C Tc=25°C Tch Tstg VISO *6 Ratings 600 600 ± [ ... ]

2SK3528-01R PDF Datasheet Download