I bought ULN2003A but I am unsure. The marking seems questionable to me. Rude logo and absence of the vertical bar. I can't find anything about the marking from the manufacturer? Anyone to help me?

enter image description here

  • \$\begingroup\$ That looks fine to me. If by "vertical bar" you mean a marking to show the pin 1 end, the circle in the bottom left corner is a common indicator for pin 1. Some manufacturers may print a vertical bar, and others may have a notch in the pin 1 end. \$\endgroup\$ Nov 8, 2023 at 18:12
  • \$\begingroup\$ I did an acetone test and the marking does not fade. The dimensions of the case seem correct and the packaging too (real dimension and tape dimension). \$\endgroup\$ Nov 8, 2023 at 18:17
  • \$\begingroup\$ Where did you make the purchase? \$\endgroup\$
    – Andy aka
    Nov 8, 2023 at 18:28

1 Answer 1


The marking looks correct: https://www.ti.com/packaging/en/docs/partlookup.tsp?partmarking=ULN2003A

The dot looks correct:

typical pin 1 indicators

But this does not prove anything; the counterfeiter can copy this from a real TI chip.

The only way to be sure to get a real chip is to buy from an authorized distributor. Some random Ebay merchant is not.

  • \$\begingroup\$ If so, it's a nice fake. I asked Texas and they cannot prove authenticity. More than testing. \$\endgroup\$ Nov 8, 2023 at 18:37

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