View buz74a datasheet:

BUZ 74 A SIPMOS ® Power Transistor • N channel • Enhancement mode • Avalanche-rated Pin 1 Pin 2 Pin 3 G D S Type VDS ID RDS(on) Package Ordering Code BUZ 74 A 500 V 2.1 A 4 ? TO-220 AB C67078-S1314-A3 Maximum Ratings Parameter Symbol Values Unit Continuous drain current ID A TC = 27 °C 2.1 Pulsed drain current IDpuls TC = 25 °C 8.5 Avalanche current,limited by Tjmax IAR 2.4 Avalanche energy,periodic limited by Tjmax EAR 5 mJ Avalanche energy, single pulse EAS ID = 2.4 A, VDD = 50 V, RGS = 25 ? L = 56.3 mH, Tj = 25 °C 180 Gate source voltage VGS ± 20 V Power dissipation Ptot W TC = 25 °C 40 Operating temperature Tj -55 ... + 150 °C Storage temperature Tstg -55 ... + 150 Thermal resistance, chip case RthJC ? 3.1 K/W Thermal resistance, chip to ambient RthJA 75 DIN