Part identifying

Semiconductor Discrete Semiconductor Products
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1768966782339760377862895632602
17689667823397603778628956326021816×4032 1.31 MB
Im looking for a replacement for TR9 I do believe it’s a voltage regulator. But I can’t find any information on it. It’s the one with the CF SN on it. It burned up on my second board.

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Hi @tj3581 ,

Likely a PNP transistor in SOT-89.

The closest I could get is this

Cheers, heke

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Hi, heke.

I propose this option: 2SD2150T100S

Datasheet

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Hi Adam,

Yeah, that looks good too. Also found 2SC3650 for that marking, but it’s very old part. I guess the first job would be to find out if it is NPN or PNP. Pretty much depends on where the emitter is connected to (denoted “E” on PCB). I was guessing that the transistor is for power path control etc. but if the “E” is connected to ground (through via), then it must be NPN.

Cheers ,heke

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Thank you so much I will test when I get home today

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Just to let you know the “E” is connected to ground (through via)

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Hi @tj3581 ,

Thanks. Then it’s likely an NPN and the one @Adam7 proposes. I’d try that first.

Can you measure the voltages at the other pins of that transistor?

Cheers, heke