This part is a kind of semiconductor called 2SK3990-01L.

Function of this product has N-CHANNEL SILICON POWER MOSFET.

Manufacturers : Fuji

Image and pinout :

Some of the text within the PDF file :

2SK3990-01L,S,SJ FUJI POWER MOSFET Super FAP-G Series 200511 N-CHANNEL SILICON POWER MOSFET Features High speed switching No secondary breadown Avalanche-proof Low on-resistance Low driving power Applications Switching regulators DC-DC converters UPS (Uninterruptible Power Supply) Outline Drawings [mm] See to P4 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 Symbol VDS VDSX ID ID(puls] VGS IAR Ratings 600 600 3.0 ±12.0 ±30 3.0 Unit Remarks V V VGS=-30V A A V A Note *1 Non-repetitive Maximum avalanche energy Repetitive Maximum avalanche energy Maximum drain-source dV/dt Peak diode recovery dV/dt Maximum po [ ... ]

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