I have a board with an unidentified SOIC-8 IC marked "302F".


I am looking for the part number of this component that is mounted in a 2 cell battery pack PCB designed for AIBO robots by SONY in 1999-2000.

This battery PCB also includes a TI bq2040 fuel gauge and a Seiko Instruments S-8232AAFT battery protection IC.

I would first like to know who you think would be the manufacturer of this component.

Close-up photo of IC top markings

Thanks for all the replies.

Edit: I add a part of the retro engineering schematic I did. The naming and type of the pins is a guess for now.

schematic diagram

What I'm sure is the connection between the IC and power resources (BAT+ for 2 cell voltage, BATM for 1 cell voltage and BAT-) and the passive components.

  • 2
    \$\begingroup\$ Logo is Microchip Technology \$\endgroup\$ – Tom Carpenter Feb 26 at 15:59
  • \$\begingroup\$ Any idea what it does in the circuit? \$\endgroup\$ – Tom Carpenter Feb 26 at 16:09
  • \$\begingroup\$ I'm not sure it's a Microchip logo. Theirs is slightly different: microchip.com/en-us/about/legal-information/… \$\endgroup\$ – jwh20 Feb 26 at 16:09
  • \$\begingroup\$ I also thought it was a Microchip quite intuitively at first. The logo is the same but it is marked in negative without the circle in which it is traditionally inscribed on all types of cases since before the 2000s. \$\endgroup\$ – clickToEdit Feb 26 at 16:27

The logo on that chip resembles Microchip Technology Incorporated.

Here is their website.

They are the makers of the famous PIC microcontrollers and now own the AVR line as well. They, of course, make many other chips.

The logo is usually inverted from that and in a circle, so it may be something else. I couldn't find a closer match.

A website like THIS can be useful to find IC logos.

  • 1
    \$\begingroup\$ Thanks for this link. I'm not sure it is Microchip. Since the logo mark is looking identical but written in negative, and without the circle that usually surrounds the logo on any packages. \$\endgroup\$ – clickToEdit Feb 26 at 16:29
  • \$\begingroup\$ Pretty sure you are correct. I've been screwing around with ICs for 20+ years and don't recognize it, it may be some no-name manufacturer that is hoping to be mistaken for Microchip. None of my IC logo resources have that exact logo. Sorry, and good luck! \$\endgroup\$ – evildemonic Feb 26 at 16:35
  • \$\begingroup\$ Yes, thank you for your help and experience #evildemonic. \$\endgroup\$ – clickToEdit Feb 26 at 16:38

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