2n5038.pdf datasheet:

2N5038NPN Silicon TransistorsFast switching speeds and high current capacity ideally suit theseparts for use in switching regulators, inverters, wide-band amplifiersand power oscillators in industrial and commercial applications.Featureshttp://onsemi.com High Speed - tf = 0.5 ms (Max) High Current - IC(max) = 30 Amps20 AMPERE Low Saturation - VCE(sat) = 2.5 V (Max) @ IC = 20 AmpsNPN SILICON Pb-Free Package is Available*POWER TRANSISTORSMAXIMUM RATINGS (Note 1)90 VOLTS - 140 WATTSRating Symbol Value UnitCollector-Emitter Voltage VCEO 90 VdcCollector-Base Voltage VCBO 150 VdcCollector-Emitter Voltage VCEV 150 VdcEmitter-Base Voltage VEBO 7 VdcCollector Current - Continuous IC 20 AdcPeak (Note 2) ICM 30Base Current - Continuous IB 5 AdcTO-204AA (TO-3)Total Device Dissipation @ TC = 25_C PD 140 W CASE 1-07Derate above 25_C 0.