[sdiy] SOIC LT101 equivalent / dilemma

rsdio at audiobanshee.com rsdio at audiobanshee.com
Wed Jul 29 20:32:53 CEST 2015

Hi Justin,

Two comments, but certainly no complete answer.

1) I just designed a board with the TL084. I don't know whether the TL082 outperforms the TL072 in your area of interest. There are tens of thousands of op-amps precisely because "performance" means something different in each application.

2) You may already be doing this, but I recommend leveraging the Mouser.com search engine to narrow your choices. You can browse to op-amps and then pick power supply ranges, noise specifications, and other criteria to narrow your list. From there, it's a matter of poring over data sheets, but at least you can rule out thousands of options fairly quickly. The caveat is that Mouser doesn't carry absolutely everything, but I doubt they're missing anything commonly available.

Hope this helps! I've found that it can really take a lot of time to find the right op-amp, but you're starting down the right path by designing for the standard pinout at the beginning. Get your PCB layout done first and then start fine-tuning the op-amp selections.

Brian Willoughby
Sound Consulting

On Jul 29, 2015, at 10:48 AM, Justin Owen <juzowen at gmail.com> wrote:
> I recently ordered a bunch of SOIC8 LT1013DDG4 from Farnell as a potential 'upgrade' for a circuit that is currently specced (and working adequately)  using TL074s. I assumed the pinout would be the same - but I've now realised it isn't.
> (What I would consider...) The standard/traditional pinout (i.e. the same as the TL07x) is apparently only available in LT101 DIP.
> So - for the op-amps in an exponential current source and some CV conditioning/limiting/biasing - what are your suggestions for an SOIC dual op-amp with a 'standard' pinout that'll work off a +/-12V supply - that I can test against a TL074 to see if I get any sort of performance boost?
> Would the OPA2134 be a potential contender? I know it's billed as an 'audio' amp.  
> FWIW - I did cull back through the many "which op-amp should I use threads" - that's how I ended up looking at the LT1013!

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