View 2sk3870-01 datasheet:

2SK3870-01N-CHANNEL SILICON POWER MOSFET Outline Drawings (mm) 200406TO-220ABFUJI POWER MOSFETSuper FAP-G SeriesFeatures High speed switching Low on-resistance No secondary breakdown Low driving power Avalanche-proof Applications Switching regulators DC-DC converters UPS (Uninterruptible Power Supply)Maximum ratings and characteristicAbsolute maximum ratings(Tc=25C unless otherwise specified)Equivalent circuit schematicItem Symbol Ratings Unit RemarksDrain(D)Drain-source voltage VDS 230 VVDSX 230 VVGS=-30VContinuous Drain Current ID 40 APulsed Drain Current ID(puls] 160 AGate-Source Voltage VGS 30 V Gate(G)Maximum Avalanche current IAR 40 ANote *1Source(S)Non-Repetitive EAS 633.1 mJNote *2

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