Author Topic: Component identification - help  (Read 235 times)

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Offline k.valentino

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Component identification - help
« on: June 14, 2021, 11:51:33 pm »
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.
 

Offline cortex_m0

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Re: Component identification - help
« Reply #1 on: June 15, 2021, 01:43:35 am »
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.
 
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Offline SpecialK

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Re: Component identification - help
« Reply #2 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.
 
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Offline k.valentino

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Re: Component identification - help
« Reply #3 on: June 15, 2021, 10:29:59 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.
Thanks for the answers! Yes, the transistor is burned (have fuga).
 

Offline bob91343

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Re: Component identification - help
« Reply #4 on: June 15, 2021, 05:38:33 pm »
I would guess the equivalent would be 2N2907A which is in TO-18 package.
 
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