I have a circuit in which the C2001 (aka 2SC2001) transistor failed after many years. I Googled about, and tried to replace it with a BC337. The BC337 got kind of warm, and didn't work. B, C, and E pins were all in the correct PCB holes, I checked and double-checked, and triple-checked. The BC337 tested OK with my hFE meter.
So, is there something 'special' about the C2001 trannies? I have seen them referred to as 'switching' transistors somewhere, I don't know what that specially means. This is being used in a flyback circuit, which switches at approx ummm 140 kHz or so.
Thanks, any help appreciated!
My previous, sort-of related question is here: What type of voltage booster circuit is this?