[sdiy] low input bias current opamps

Guy McCusker guy.mccusker at gmail.com
Wed Aug 15 09:41:13 CEST 2018


I am a long way from knowing what I am doing but when I want to play
with devices with specific parameters like this I use the TI
parametric search tool.

http://www.ti.com/amplifier-circuit/op-amps/products.html?pqs=pocs&familyid=1293#p480=4;4&p1261min=0.9;30&p1261max=30;105&p2954=PDIP

Weirdly this doesn't bring up the LF444, I think because that is part
of a "specialist" range of devices not covered by this search. Which
is annoying.

Here's a similar search for Analog Devices parts:
http://www.analog.com/en/parametricsearch/11085#/p2687=|4&p4108=0.000038|0.0105&ps5=14%20ld%20PDIP%20(300%20mil)&d=sel|0|300|2839|2840|4089|4095|4108|4500|4502|s3|s5|d

ST have one too but I hate it so I don't use it :)







On Wed, Aug 15, 2018 at 4:43 AM, David G Dixon <dixon at mail.ubc.ca> wrote:
> Hey Team,
>
> I'm looking for opamps with the following properties:
>
> 1) Through-hole
> 2) Quad opamp
> 3) 14-DIP package
> 4) High power range (+/-18V, say)
> 5) Low input bias current (10 pA or less typical)
> 6) Pin-compatible with TL074, etc.
> 7) Not LF444 (cuz they all seem to be defective)
>
> So, basically, I'm looking for a suitable alternative for LF444.
>
> So, here are my questions:
>
> A) Do you know of such a thing
> B) How does one go about finding such a thing, generally?
>
> Thanks in advance!
> Dave (Floating VCA) Dixon
>
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