[sdiy] Odp: low input bias current opamps
modular at go2.pl
Wed Aug 15 18:10:16 CEST 2018
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 ______________________________ Synth-diy mailing list Synth-diy at synth-diy.org synth-diy.org synth-diy.org
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