I could not find a local shop that sells 2sd 1804 transistor, i can only find 2sc5707 transistor.
D1804
The D1804 has a 20W Collector Dissipation,PD. The C5707 has a 15w Collector Dissipation,PD.
what's the rule for replacing transistor in inverter? Does the Collector Dissipation have to larger than the original one? What 's the Collector Dissipation,PD? Is it meant the max power that the transistor can draw without damaging itself?