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I'm looking for a transistor. Unfortunately the transistor is so burnt that I can't see the part number. It's from ST and I found a circuit diagram for the board, but there seems to be no model no in the circuit diagram.
Could somone maybe help me with that?

Thank you very much

Burnt Transistor

Circuit diagram

Circuit diagram (zoomed)

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    \$\begingroup\$ That symbol's for a thyristor, not a transistor. \$\endgroup\$
    – Hearth
    Commented Jan 1, 2023 at 4:06
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    \$\begingroup\$ Triac not Thyristor. \$\endgroup\$
    – RoyC
    Commented Jan 1, 2023 at 4:44
  • \$\begingroup\$ @RoyC GE SCR manual ('72) says the following, which would include the triac (or TRIAC) as a type of thyristor. I don't have access to the 1964 IEC document. \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Jan 1, 2023 at 5:39
  • \$\begingroup\$ Ah, Thank you. I didn't know about TRIACs. Did only Laptop repairs - there a TRIAC is not a thing (Maybe for the Powersupply) :-D \$\endgroup\$
    – DudiPupan
    Commented Jan 1, 2023 at 11:12

2 Answers 2

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I will take a SWAG: it is a ST BTA?? triac. I would try a BTA16-800BWRG from STMicroelectronics. That is overkill but looking at the circuit board it was running hot. A small heat sink added would not hurt anything. It was apparently also shorted with a probe or something. It is only a few bucks which should not matter as you are not building thousands. This could also indicate you have a motor failing.

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Can't be sure from what is visible but it sure looks like a smoked ST BTA12 triac.

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