Assuming we have a transistor that can bear 400v 0.3A, is that means it can bear 30A if we used it for 4v only or it always withstand 0.3A?
(since P1 = P2 = 0.3 * 400 = 30 * 4)
Electronic – Maximum Transistor current and voltage
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Best Answer
Many power transistors have a SOA (Safe Operating Area) graph in their datasheet, here's an example:
The safe area is the bottom left side so:
Vce = 5 V at Ic = 20 Amps is just OK
but
Vce = 50 V at Ic = 2 Amps is not
Also note that it states Tc = 25 degrees Celcius meaning you have to cool this device such that its case will not exceed 25 degrees Celcius.
Also not that for a limited time, the device can handle a little higher value. It is not clear how much time it needs to recover after such an event.