buz103.pdf datasheet:

BUZ 103SIPMOS Power Transistor N channel Enhancement mode Avalanche-rated dv/dt rated Low on-resistance 175C operating temperature also in TO-220 SMD availablePin 1 Pin 2 Pin 3G D SType VDS ID RDS(on) Package Ordering CodeBUZ 103 50 V 40 A 0.04 TO-220 AB C67078-S1352-A2Maximum RatingsParameter Symbol Values UnitContinuous drain current ID ATC = 23 C 40Pulsed drain current IDpulsTC = 25 C 160Avalanche energy, single pulse EAS mJID = 40 A, VDD = 25 V, RGS = 25 L = 63 H, Tj = 25 C 100Reverse diode dv/dt dv/dt kV/sIS = 40 A, VDS = 40 V, diF/dt = 200 A/sTjmax = 175 C 6Gate source voltage VGS 20 VPower dissipation Ptot WTC = 25 C 120Operating temperature Tj -55 ... + 175 CStorage temperature Tstg -55 ... + 175Thermal resistance, chip case RthJC 1.25 K/WThermal resistance,