I need help identifying an IC. These are used for lithium-!ion battery charging/protection.

The SMD IC marked 8211 is a battery protection IC (MOSFET). I was able to find out from the circuit that the bottom pad is drain, 1, 2 is source, 5, 6 is source, 3, 4 is gate which is controlled by the IC marked D4 GK. I am not able to identify these SMD parts.

Mark in SMD IC (small one with mark D4 or DA) is not clear.

SMD IC 8211

SMD IC Mark: D4 GK

SMD IC Mark: D4

  • \$\begingroup\$ It's the other out-of-focus marking that is important. \$\endgroup\$
    – Andy aka
    Mar 21, 2023 at 18:20
  • \$\begingroup\$ Marking is not clear, its D4 and GK (below) \$\endgroup\$ Mar 21, 2023 at 18:21
  • \$\begingroup\$ maybe it is not a 4 ... the horizontal line is at an angle ... it could be a logo \$\endgroup\$
    – jsotola
    Mar 22, 2023 at 0:12
  • \$\begingroup\$ Yes, possible its delta symbol. \$\endgroup\$ Mar 22, 2023 at 4:50

2 Answers 2


D4 R5480K260CL Nisshinbo R5480K Series

enter image description here

  • 1
    \$\begingroup\$ ZendX - Hi, Thanks for trying to help. I agree that the R5480K is the type of Li-ion battery protection IC that would fit as a possible identification of that IC marked D4 GK. However in the R5480K datasheet, I couldn't find any listing of the possible top markings to confirm that those codes are for that specific IC. Do you have a link or other reference to confirm the identification with those top codes? You can always edit your answer to add references. Thanks. \$\endgroup\$
    – SamGibson
    Jun 14, 2023 at 23:42
  • \$\begingroup\$ Thank You, I ordered similar product from ABLIC- S-82A1A series , same pinouts.. \$\endgroup\$ Jul 9, 2023 at 6:07

Product from Ablic: S-82A1A Series



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