On 2021-04-01 8:52 a.m., chuckrr wrote:
> What is standard procedure for tying off unused op-amp inputs?
> 
> If for instance there is a circuit which uses only (2) of the (4) available 
> op-amps in a DIP package,
> what is the normal protocol for dealing with these unused units?
> 
> Can the unused inputs just be left floating?   Doing do on an LM-324 runs the 
> output at around 7.45 volts
> when the chip is operating from a single 9 volt supply.   Does doing this 
> draw more current than tying off inputs to GND?
> 
> Thanks,    Chuck
> 

Here's one guide. There are others. And there are deep dives online by
the likes of Bob Pease and Paul Rako if that's what you're into.

https://www.ti.com/lit/an/sboa204a/sboa204a.pdf

--Toby

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