[sdiy] The TL074 has changed!

[Doug Jackson]

TL074....  TL074...

We all know that Gods own opamp is the 741...

Get off my lawn :-)

On Sat, 2 Aug 2025, 7:04 pm Mike Bryant, <mbryant at futurehorizons.com> wrote:

> I'll add to this - the new one is crap !!   I used to use the TL07x series
> in low cost mic-amps and other mixer circuits but the H series are noisy as
> hell.   I just specify other manufacturers now.
>
> They really should have given this opamp a different part number - it's
> simply not a compatible device, even if it fixes known issues.
> ------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Jay
> Schwichtenberg via Synth-diy <synth-diy at synth-diy.org>
> *Sent:* 02 August 2025 06:30
> *To:* synth-diy at synth-diy.org <synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] The TL074 has changed!
>
> Mike,
>
> Would you please share your experiences about the new chip not working
> for you?
>
> Thank you.
> Jay S.
>
> On 8/1/2025 5:23 PM, Mike Beauchamp wrote:
> > Last week I received an order of partially assembled prototype PCBs.
> > It's a rather large circuit, with the bulk of the IC's being the
> > venerable Texas Instruments TL074C that I've been using for 15 years.
> >
> > Compared to the previous boards, I immediately noticed that the power
> > consumption was way lower on this batch - from ~16W down to 11.8W,
> > definitely significant. That is about 1/4W less power per TL074.
> >
> > After some snooping with the help of people on forums, it seems as
> > though Texas Instruments changed fab processes (
> >
> https://media.digikey.com/pdf/PCNs/Texas%20Instruments/PCN20221219006.1.pdf
> > ). The new version has been around for a while as the TL074H, marketed
> > as an "improved version", but according to the latest datasheet from
> > July 2025 ( https://www.ti.com/lit/ds/symlink/tl074h.pdf ) Table 9-1
> > Page 34, the new die is now being used in all of the other TL074s
> > (except TL07xM):
> >
> > TL07xH - is the new version
> >
> > TL07xM - will still be the old version
> >
> > TL07xA, TL07xB, TL07xC and anything else - can be either the new or
> > old version with no way of telling.
> >
> >
> > One part of my circuit started working incorrectly with the new
> > version, but it was relying on an edge-case near phase reversal. I've
> > since revised the circuit to work correctly with the new and old
> > versions, but this makes me wonder how the change to this op-amp might
> > effect sensitive circuits, or those creative uses we see in synths,
> > audio and pedals often. It also seems like the new version has a lot
> > more low frequency noise as well.
> >
> >
> > Thoughts?
> >
> > Mike
> >
> >
> >
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