Electronics > Projects, Designs, and Technical Stuff
quad op amp pin outs?
loki42:
Are there quad op amps, if possible similar or better noise performance to the TL074 that have a switched pin out with the inverting and not inverting input pins switched? I need it in a SOIC format. Currently I'm reworking the boards to fix my mistake but it'd be a lot faster to swap the chips.
David Hess:
I am not aware of any with the inverting and non-inverting pins swapped.
Most quads use the LM324 pinout but there are exceptions like the RC4136.
GK:
loki42:
Not sure if this is the easiest option but I've just thought of something that might have been obvious to others... how about I make a board that has a SOIC format on the bottom and a TSSOP format on the top and put new op amps on? I guess I could have SOIC on both but then I think I'd have to hot air the PCB on the solder the top ones? Maybe still pretty quick.
David Hess:
Incidentally, there is some reasoning behind operational amplifier pinouts. The outputs are placed closer to the inverting inputs than the non-inverting inputs to prevent positive feedback through capacitive coupling. Comparators want the opposite leading to the very different LM339 quad comparator pinout. Dual comparators copy the dual operational amplifier pinout which is not optimal for them.
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