Re: SN7400N Quad opamp which side is pin 1?

Tom Bowers

The notch is pin 1, lower left corner in your photo. the part number is
near pin 7. This is a quad 2 input NAND gate device from the fist vintage
of 7400 series TTL. Made in 1972.

Tom Bowers

On Wed, Apr 22, 2020 at 8:33 AM DW <> wrote:

Here is a rather unusual design at least for me. This chip contains both
the notch and the circle, I want to say the notch is pin 1 but I am not
100% certain that might be the case, any thoughts? I am trying to be
certain not to install it in reverse.

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