Recently I was working on a 5V switching power supply project and I found the best PCB for building it. But in the middle I got confused when I saw an IC with the letters ID2J.

It has 5 pins like an op-amp or an optoisolator SMD. I searched for it and found nothing, no manufacturer and no datasheet. On the PCB silkscreen it's called IC1.

Does any one know what kind of IC is this?

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  • \$\begingroup\$ That is a SOT23-5 package. \$\endgroup\$
    – KyranF
    Oct 27, 2014 at 8:45
  • \$\begingroup\$ IC1 means it probably one of the first stages of the schematic. Often they are power input/filtering/management schematics, so this is possibly a low power linear regulator or a reset supervisor, or similar IC. \$\endgroup\$
    – KyranF
    Oct 27, 2014 at 8:45
  • \$\begingroup\$ Also what's with the crap photo quality? It would really help for a wider shot to see the context of the IC, and it's surrounding components. Also, how is this a 5V switching supply project, how did you just "find the best PCB"? \$\endgroup\$
    – KyranF
    Oct 27, 2014 at 8:59
  • \$\begingroup\$ I zoomed in for the IC letters. so that makes it crap. I will be really happy if you give me a helpful answer... \$\endgroup\$
    – kia_rst
    Oct 27, 2014 at 9:03
  • 1
    \$\begingroup\$ Could be a voltage regulator like smdcode.com/en/smd/code/… in general omitting the first or last digits when googling helps sometimes. \$\endgroup\$
    – PlasmaHH
    Nov 11, 2014 at 11:41

1 Answer 1


Searches on ID2J seem to draw a complete blank.

However a search on 1D2J brings up this page... http://m.cnledw.com/bbs/topic/view/163682.html

which contains the entry

表面代码丝印 1DYJ 1DZJ 1D0J 1D1J 1D2J 1D3J 1D4J 1D5J 1D6J 1D7J 1D8J 1D9J 封装SOT23-6封装SOT23-5封装SOT23是什么型号?

unfortunately I can't get you any closer than that ... maybe someone else can? May be misleading because the mark does look like "I" rather than "1"

  • \$\begingroup\$ yes, I agree it does look more like an I than a 1. \$\endgroup\$
    – KyranF
    Oct 27, 2014 at 10:07
  • \$\begingroup\$ yes that's an "I". \$\endgroup\$
    – kia_rst
    Oct 27, 2014 at 10:25

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