[sdiy] The TL074 has changed!

[drheqx]

That's good to know. My company uses several TL0 variants. Not for audio,
but definitely for precise functions. I'll speak to my people on Monday
about this.

I love the series though and I'll continue to use them in my creations.
Certain vibe plus nostalgia.

Mike






On Fri, Aug 1, 2025 at 8:27 PM Mike Beauchamp <list at mikebeauchamp.com>
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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