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Component identification - help

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k.valentino:
Hi, need help with identification one transistor  |O (or maybe voltage regulator). I need to replace it.

MMBT2907A ???

The transistor is burned and is from car's gas analyzer machine that have problem with the display.

cortex_m0:
MMBT2907A makes sense, if the theory of the circuit is to vary the LM324 negative supply rail with changes in temperature.

I'm not sure why you'd do that, but it's a circuit I could imagine working.

SpecialK:
Is it really burned?

The SMD code app on my phone suggests 2.5V LDO. 

I guess I wouldn't mind a look at the complete board.

k.valentino:

--- Quote from: SpecialK on June 15, 2021, 03:23:17 am ---Is it really burned?

The SMD code app on my phone suggests 2.5V LDO. 

I guess I wouldn't mind a look at the complete board.

--- End quote ---
Thanks for the answers! Yes, the transistor is burned (have fuga).

bob91343:
I would guess the equivalent would be 2N2907A which is in TO-18 package.

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