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Need help identifying this vintage IC

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magic:
It may be from early '70s because the 1977 NS transistor databook already uses their later logo.

Test every pair of pins in diode mode in both directions and see what happens. The pin which has a PN diode to many (not necessarily all) other pins is likely ground.

DiddlyJackSquat:

--- Quote from: amyk on May 24, 2021, 07:21:08 am ---That is not a tube :o

Here's the datasheet for that one: http://www.supermoduul.com/PDF/AY%205%208102.pdf

--- End quote ---
i do know that's the datasheet but that's how radiomuseum hyperlinks them  ;D


--- Quote from: magic on May 24, 2021, 01:41:36 pm ---It may be from early '70s because the 1977 NS transistor databook already uses their later logo.

Test every pair of pins in diode mode in both directions and see what happens. The pin which has a PN diode to many (not necessarily all) other pins is likely ground.

--- End quote ---
only one pin has a PN diode to another  :scared:

magic:
That could be a bandgap shunt reference but I'm not sure if National made anything like that in DIP8 at the time.
Which pins are connected with the diode?

I just tested µA741, NE555, UC3842 and LM358 and sure enough, they all have multiple diodes.

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