Transistor Identification?

[Aaron]

Does anyone know what this transistor is? It's on a little SG type oscillator so I'm guessing it is a NPN but do not know what company that symbol goes to. Nobody as Mouser or Digikey can identify it.

[mikrovolt]

best guess is Thomson TO-92

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1 x BUW52 NPN Power Transistor 250V 150W 250V 20A Thomson TOP-3L 1pcs | eBay

[Duncan]

Its a bit of a minefield trying to identify transistors from the billions Aaron. I wonder might I suggest you invest in a simple tester something like this one

https://www.banggood.com/Transistor-Tester-Diode-Triode-Capacitance-ESR-resistance-Meter-p-919181.html?rmmds=search

It quickly goes through a few tests identifies the component and it orientation and then all the operating parameters so you've got a fighting chance to closely match it to the transistor tables and specs. or simply try a few in the instrument until you find a pretty good match. Its a bit frustrating that you'll have to lift a couple of legs or cut the PC to apply the test still its the best suggestion I can offer. works for me even doing pretty good matching of push pull circuits
kind regards Duncan

[blackchisel97]

Hi Aaron,

Possibly 2N5249, which is NPN, 50V 0.1A

V

[Duncan]

Hi blackchisel - might be some trouble from my end but it seems your link isn't playing the game right now - regards D

[blackchisel97]

Hi blackchisel - might be some trouble from my end but it seems your link isn't playing the game right now - regards D

Thanks Duncan, fixed now.

V

[Aaron]

2n2222

Thanks for all your input - Duncan, I like that Transistor tester, will have to get one of those.

I heard from someone that worked on this particular circuit that it is equivalent to a 2N2222 so that makes it easy. Mystery solved!