View 2sk1478 datasheet:

Power F-MOS FETs 2SK1478 2SK1478 Silicon N-Channel Power F-MOS Unit : mm Features 10.0± 0.2 4.2± 0.2 Low ON-resistance RDS(on) : RDS(on)= 0.4?(typ) 5.5± 0.2 2.7± 0.2 High-speed switching : tf = 44ns(typ) No secondary breakdown o3.1± 0.1 High breakdown voltage, large allowable power dissipation Applications 1.3± 0.2 Non-contact relay 1.4± 0.1 Solenoid drive +0.2 0.5 -0.1 0.8± 0.1 Motor drive Control equipment 2.54± 0.25 Switching mode regulator 5.08± 0.5 1 2 3 Absolute Maximum Ratings (Tc = 25?C) 1 : Gate Parameter Symbol Rating Unit 2 : Drain 3 : Source Drain-Source breakdown voltage VDSS 250 V TO-220 Full Pack Package (a) Gate-Source voltage VGSS ±20 V DC ID ±8 A Drain current Pulse IDP ±16 A TC =25?C 40 Allowable power PD W dissipation Ta =25?