I have looked through all the marking sites and where they lead, but have not found a replacement yet. Does anyone have a clue how to identify the 3V regulator marked "9B 2P"?

I've measured the voltages on a good one:

Pin 1: 4.7V
Pin 2: GND
Pin 3: 3.28V
Pin 4: NC
Pin 5: 4.7V

enter image description here

  • \$\begingroup\$ It may help to include an image with surrounding components for context. \$\endgroup\$
    – JYelton
    Feb 20 at 17:21

1 Answer 1


The package is SOT-89-5. I think it is XC3209F331PR or XC3209F332PR from TOREX.

Picture from LCSC: enter image description here

And below a little explanation of how I determined these 2 part numbers.

enter image description here enter image description here

  • \$\begingroup\$ Thank you, and thank you for the lesson as well. \$\endgroup\$
    – AhaJr
    Feb 21 at 14:06

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