[sdiy] The TL074 has changed!

[Vladimir Pantelic]

don't you all build your own discrete opamps???

On Sat, Aug 2, 2025, 13:20 Doug Jackson via Synth-diy <
synth-diy at synth-diy.org> wrote:

> 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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