[sdiy] Odp: low input bias current opamps

Pete Hartman pete.hartman at gmail.com
Wed Aug 15 18:48:46 CEST 2018


Is an SMD -> TH adapter an option, Dave?

That would save you having to do any SMD layout, but let you get the
advantage of the better/newer SMD parts....

On Wed, Aug 15, 2018 at 11:10 AM, Roman <modular at go2.pl> wrote:

> The answer to A) is no, because of 1)
> Recently I made some THT design and was just so happy about it until I
> found how many parts that I freely use in SMD are simply not made in THT,
> so the choice usually comes to one part if any.
>
> The answer to B) is usually Mouser, but they have sometimes errors in
> describing parameters, or take different values to the table, like
> "typical" for one part and "minimum" for the other part. Sometimes I use
> DigiKey, mostly because they seem to have more refined parameters to search
> and I can type the quantity of interest, and then sort by the price. Mouser
> sorts only at qty 1 which is useless.
> And obviously all manufacturer's websites contain parametric search, which
> is the most accuratre, but still I prefer Mouser because it gives me
> guidance of the price and availability.
>
> And if it's for some S&H, why don't you stick with TL0xx? Are you sure
> your switching key has lower leakage than bias of TL0xx opamp? Or try LF347
> maybe but it's inferior to LF444 in this application anyway.
>
> Give LF444 a chance, get new ones, maybe they were handled very badly and
> inputs were damaged by ESD because of bad storage. They would still work
> but bias may be in range of nA instead of pA.
>
> Roman
>
> Dnia 15 sierpnia 2018 05:48 David G Dixon <dixon at mail.ubc.ca> napisał(a):
>
> 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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