I received chips different from chips that I ordered. Already asked for refund.
But I am curious what these chips actually do. I searched several SMD code books, but had no luck. Does anybody have any clue what they could be?

It's SOT-23-6, Marking code 63M09. enter image description here

I have ordered battery ballancer ICs HY2213-BB3A.
But I do not think the chips I received are just some clones, because I measured no diode drop across pins 2-3 (there should be a diode internally). So I assume those are completely different chips.

  • \$\begingroup\$ electronics.stackexchange.com/a/334129/107479 \$\endgroup\$
    – dim
    Oct 13, 2021 at 10:55
  • \$\begingroup\$ Im not sure at all, but often on those packages there are Fets or Jfets \$\endgroup\$
    – user201301
    Oct 13, 2021 at 11:26

1 Answer 1


I probably found a good candidate.
I googled and found some strange page which is referring "63M09" and "OB2263MP". So it could be OB2263MP (Current Mode PWM Controller).
It's SOT-23-6, and I measured some diode drops and resistances across certain pins and measured values agree with internal schematic of this chip. So it is pretty much this chip. I am not 100% sure, I would have to test that chip in some circuit to be 100% sure.

  • 1
    \$\begingroup\$ OB 2263 mp is correct part no. For 63mo9 I have used it in 12v 3amp power supply \$\endgroup\$ Jul 4, 2022 at 8:43

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.