2sd2141.pdf datasheet:

Equivalent circuitCBuilt-in Avalanche Diode Bfor Surge AbsorbingDarlington 2SD2141(1.5k)(100)ESilicon NPN Triple Diffused Planar Transistor Application : Ignitor, Driver for Solenoid and Motor, and General Purpose Absolute maximum ratings (Ta=25C) Electrical Characteristics (Ta=25C) External Dimensions FM20(TO220F)Symbol 2SD2141 Symbol Conditions 2SD2141 UnitUnit0.24.20.210.1c0.52.8 AVCBO 38050 ICBO VCB=330V 10maxVmAVCEO 38050 IEBO VEB=6V 20maxVVVEBO 6 V(BR)CEO IC=25mA 330to430V0.23.3aIC 6(Pulse10) hFE VCE=2V, IC=3A 1500minAbVIB 1 VCE(sat) IC=4A, IB=20mA 1.5maxAMHzPC 35(Tc=25C) fT VCE=12V, IE=0.5A 20typWpF 0.15Tj 150 COB VCB=10V, f=1MHz 95typ 1.35C0.151.35Tstg 55 to +150C0.85+0.2-0.10.45+0.2 2.4-0.1 0.22.54 2.540.22.2Weight : Approx 2.