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Old 29th September 2004, 11:59 PM   #1
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Default Sub for LF411CN op amp?

Anyone know a substitute for a LF 411CN op amp? Any help would be appreciated thanks.

Joe
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Old 30th September 2004, 12:01 AM   #2
mlloyd1 is offline mlloyd1  United States
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Is this for a servo? I've used the AD711 and been pretty happy.
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Old 30th September 2004, 12:59 AM   #3
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Thanks for the reply.

Its part of the front end of a Citation 4 channel amplifier. I'm told they don't make the 411 anymore.
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Old 30th September 2004, 02:10 AM   #4
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Default The '711 was designed to be a direct replacement, but.....

There are lots of other JFET input op-amps to chose from.

There are some things that you may need to take into account, and you may not know until you try them.

Some op-amps may have a greater turn-on thump.

Depending on the topology, I have found instances where a '711 did not work in place of a '5534, as the inputs were too close to the negative rail, and it was outside of its common-mode range.

Chances are that the '711 will be fine. And it is cheap and readily available.

Jocko
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Old 30th September 2004, 02:23 AM   #5
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National's web site shows no indication that the LF411CN has been discontinued. It's still an active part as far as they're concerned. The AD711 is a better-than sub if you want to pay the extra money. The Analog Devices parts should be easier to get now that Digi-Key is stocking them.
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Old 30th September 2004, 10:33 AM   #6
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Thanks for the information. I had been told by my parts supplier that the 411 wasn't available. It is nice to know that it is. The 5532 won't work because the pin out is different. I did find an old ECG book and the 411 is supposed to be the same as the 937M.
I will try that one because I don't want to pay the shipping and handling from digikey on one part.

Thanks
Joe
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Old 30th September 2004, 02:14 PM   #7
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Default Don't use generic substitutes!!!!

You mean that no one that you know has one in their junque box???

Most of us get around the "only one part from Digikey" problem by buying lots more parts.

5534, not 5532...........!

Jocko
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Old 30th September 2004, 02:55 PM   #8
UrSv is offline UrSv  Sweden
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Default I found a worthy candidate...

Sorry, I'm having a bad day so I could not keep from recommending that I send you one from my private stash.

Drop me an e-mail and I'll be able to drop it in the mail next week if the delay is OK.
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