any suggestions for a high-voltage quad op-amp?

[zachary vex]

the lm324 has a power supply limit of 32 volts (or +/-16).  this isn't enough for my latest application... any ideas for a substitute that can operate on, say, +/-25VDC rails?  i've never ventured out into this territory.

[Mark Hammer]

I posted a zipped scan of the Horowitz & Hill (1989) tables of op-amp specs at my site, found under "Ops, I did it again" on page 5 of the site (right click and save first).  If you look on page 11 of 15, you'll see a small handful of high-voltage op-amps that might be worth looking at.  What you'll see throughout the rest of it is a ceiling of pretty much +/-22v, though.

Bear in mind this was a 1989 publication and perhaps not even that exhaustive at the time.....but it's a start.

Best of the holidays to ya, fella.

[MartyMart]

I have not "gone there" either, have you had a look at the Texas instruments site ?
Perhaps there will be some higher rated op-amps there.

Regards,
Marty.

[mlabbee]

TI has some - here's one: http://focus.ti.com/docs/prod/folders/print/opa404.html

If you go to their site, you can do a parametric search to drill dowm to what you need.

And they will send you free samples 3-5 of each for up to like 8 chips at a time, so you can figure out which ones work best.

[zachary vex]

i discovered that the humble 741 can handle remarkably high supply voltages.  surprise!  thanks everyone!

[stm]

If you use a 741 other than the "C" suffix you could supply it with +/-20 Vdc.  Be careful with the following though:

1) The absolute maximum is specified as 44V diff or +/- 22V, but it is not a good design practice for reliable and long-term operation.

2) You must be sure your supplies are reasonably stable and well regulated, otherwise they may exceed the maximum supply and damage the IC.

3) Even at +/-20V supplies, the input and output voltage ranges are specified as +/- 15V only.

Regards,

STM

[Vsat]

You could try the National Semi LM143/LM343 (old chip, if you can find it). Same pinout as 741, they are rated for +/- 40V rails... slew rate same as 741, gain bandwidth product is somewhat better. Some of the Japanese op amps may be rated for more than the typical +/-18 max recommended supply voltage.
Regards, Mike

[Peter Snowberg]

Linear has a few 44V devices that go rail to rail on both ins and outs.

http://www.linear.com/

[ExpAnonColin]

I always thought you were an IC-free guy except for the 1641.  I can't offer any higher than anyone else has.

-Colin