I recently desoldered this transformer from a circuit board I found, and I need help identifying it. Do the numbers have anything to do with it?

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  • 1
    \$\begingroup\$ You might edit your question to say what the purpose of the circuit is, make / country of origin, pin spacing, etc. \$\endgroup\$
    – Transistor
    Jul 22, 2022 at 10:41
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    \$\begingroup\$ Something this small is unlikely to be for mains power, so my guess would be an audio transformer. Try putting an audio sine wave (e.g. 1 kHz) in one side, and see what comes out of the other side. That'll tell you the turns ratio, and if you find a similar-looking part, with similar turns ratio and resistance, you'll probably be in luck. \$\endgroup\$
    – jayben
    Jul 22, 2022 at 10:46
  • \$\begingroup\$ @jayben Audio transformer, or possibly an SMPS transformer. \$\endgroup\$
    – Hearth
    Jul 22, 2022 at 12:58
  • \$\begingroup\$ how many pins does it have? ... might not he a transformer \$\endgroup\$
    – jsotola
    Jul 22, 2022 at 15:51
  • \$\begingroup\$ Most probably custom. You can measure the core, measure or guesstimate the number of turns and perhaps use it for something useful. \$\endgroup\$
    – winny
    Jul 22, 2022 at 19:06

1 Answer 1


Often this is custom transformer and the code is an Internal Customer Code, related to his BOM. A saw similar transformers in old Servo Drive.


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