I,m currently learning and experimenting with transistors and have the following circuit which destroys the transistor but I don't know why? I use DC electronic load and I increase the current in small steps until the current reaches about 0.6A. Base current is ~11mA. Than the transistor fails in conductive state without even overheating. The surface temperature stays below 50°C all the time and the voltage difference between the Collector and the Emitter is less than 0.2V at 0.6A Collector current flow.
In my understanding this transistor should be able to conduct continuously 2A of current at any voltage up to 45V.
I am using ZTX690B/ 1W /NPN 45/45V 2A hfe 400 Ucesat 0.5V CBE
Here is the schematic: