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I need help identifying this rusty smd component (sot-23 3 pins). It comes from an early 90's sony discman.

Thank you!

Rusty component

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  • \$\begingroup\$ Can you measure any (body) diodes inside it with a multimeter? If yes, what polarity/pinout do you get? This should narrow down the searches. \$\endgroup\$
    – winny
    Apr 5, 2020 at 17:25
  • \$\begingroup\$ Hi @winny. There's around 0.7v between lower left and right pin. Also similar voltage between lower left and top pin. 0v between right and top pin. Values measures with a multimeter (diode mode) \$\endgroup\$ Apr 5, 2020 at 17:50

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SANYO 2SD1048. http://www.datasheetcatalog.com/datasheets_pdf/2/S/B/8/2SB815.shtml

It’s an PNP “audio” transistor. 20 V and 0.7 A rated.

Given the 0.7 A rating which is a bit more than small signal standard, was it located close to the speaker/headphones output?

X denotes 2SD1048. 7 denotes a hFE between 300 and 600.

You can most probably replace it with any PNP with similar hFE and current capability.

enter image description here

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    \$\begingroup\$ Great!. Thank you @winny. \$\endgroup\$ Apr 5, 2020 at 17:55
  • \$\begingroup\$ @perplex_bcn You are welcome! Feel free to accept my answer when you have verified it was correct. \$\endgroup\$
    – winny
    Apr 5, 2020 at 18:04

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