[sdiy] Cheap low input current opamps?

pata at ieee.org pata at ieee.org
Thu Sep 12 01:10:58 CEST 2013


HI Dacid and the Lists,

I love CA3140, legacy old MOS input OP Amp.

http://www.intersil.com/content/intersil/en/products/amplifiers-and-buffers/all-amplifiers/amplifiers/CA3140.html?_charset_=UTF-8

Price is 70-80 JPY each in Japan.

Taku


(2013/09/12 3:19), David G Dixon wrote:
> Hey Team,
>
> I'm looking for a cheap alternative to the LF442/LF444 opamps, which have
> very decent input current specs and therefore recommend themselves for use
> as S&H buffers (typical offset current 5 pA, typical bias current 10 pA).
> I'm coming up short with Google searches.  Does anyone here have any
> suggestions?  The TL06X series is pretty good with typical bias current of
> 30 pA, but I'm not finding anything else that isn't much more expensive.
>
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