I have this chip on a breadboard that i want to buy, in order to populate PCBs with it.

I searched and searched the internet with the text that it has on the upper part of it, but no matter how much i searched, i could not find the part.

I took some pictures, in case someone recognizes the IC.

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enter image description here

I took two pictures, since it was hard to focus or achieve perfect lighting. The text on top of the ICs writes "CU251 78M AN9N G4".

This is a MUX/DEMUX IC.

  • \$\begingroup\$ Digital or analog mux? \$\endgroup\$
    – Hearth
    Commented Nov 3, 2020 at 13:54
  • \$\begingroup\$ I think digital (it is connected with an arduino) \$\endgroup\$ Commented Nov 3, 2020 at 13:56
  • 1
    \$\begingroup\$ inserting your keywords in google, you get :ti.com/lit/gpn/sn74cbt3251 \$\endgroup\$ Commented Nov 3, 2020 at 13:56
  • \$\begingroup\$ @MarkoBuršič Thank you Marco! \$\endgroup\$ Commented Nov 3, 2020 at 14:11

1 Answer 1


Entering "CU251" on https://www.ti.com/packaging/docs/partlookup.tsp gives you the SN74CBT3251.

  • 1
    \$\begingroup\$ Nice resource. Wish more manufacturers would publish this info (I wonder if they had to do it internally to consolidate all the products from competitors they bought). \$\endgroup\$ Commented Nov 3, 2020 at 14:00

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