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'[EE]: LF355 Replacement for Peak Detect circuit'
2002\05\19@002428 by Donovan Parks

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Hello,

I am looking for a replacement for National's LF355 (being discontinued) for
use in a peak detect circuit.  Basically, a FET-input op-amp with 30pA or
less bias current and 20mA or more output current.  Any suggestions?  It
would be nice if national would recommend replacements when they discontinue
their parts - guess I'm dreaming.

Regards,
Donovan

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2002\05\19@003503 by tundra

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Donovan Parks wrote:
>
> Hello,
>
> I am looking for a replacement for National's LF355 (being discontinued) for
> use in a peak detect circuit.  Basically, a FET-input op-amp with 30pA or
> less bias current and 20mA or more output current.  Any suggestions?  It
> would be nice if national would recommend replacements when they discontinue
> their parts - guess I'm dreaming.
>
> Regards,
> Donovan
>

A CA3140A may come close to what you want.  It's a BiFET device with much
less bias current than you need, but I don't recall the rated output current.
I used to use these for audio applications - *very* quiet and great parts
overall.  Jameco has them and you can find the spec sheets there as well.
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