Op amp question

Archiver

This is prob a simple question. Thought I'd ask this before I fried an op
amp. For an op amp (LM324) that has a max supply capability of 32V:

I am supplying it with 5v (V+). Would I cause any damage if it received a
differential potential greater than 5V on its inputs? I'm not concerned
with clipping as I'm using it as a trigger. Just don't want to fry the IC.

Thanks,
Craig

Archiver

Just checked the data sheet for the National
Semiconductor version of the LM324. It claims that the
input voltage can range up to +32v and is independent of
the supply voltage.

Just the same, a zener clipper on the input wouldn't
hurt.


--
"They that can give up essential liberty to obtain a
little temporary safety deserve neither liberty nor
safety." - Benjamin Franklin
> This is prob a simple question. Thought I'd ask this before I fried an op
> amp. For an op amp (LM324) that has a max supply capability of 32V:
>
> I am supplying it with 5v (V+). Would I cause any damage if it received a
> differential potential greater than 5V on its inputs? I'm not concerned
> with clipping as I'm using it as a trigger. Just don't want to fry the IC.
>
> Thanks,
> Craig
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

Archiver

My old National book indicates the input voltage should not go below gnd by
more than 0.3V. Also, max input common mode input is Vcc-0.3 volts, or 4.7
volts in your case. Max input of 32V will not kill the IC, but operation is
not guaranteed to be "normal". The suggestion of input clamping sounds
wise, except a diode cannot keep the input from going more negative than 0.3
volts, (even with most Schottky diodes).

Ray McArthur

> I am supplying it with 5v (V+). Would I cause any damage if it received a
> differential potential greater than 5V on its inputs? I'm not concerned
> with clipping as I'm using it as a trigger. Just don't want to fry the
IC.