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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. </div>
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They really should have given this opamp a different part number - it's simply not a compatible device, even if it fixes known issues.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Jay Schwichtenberg via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 02 August 2025 06:30<br>
<b>To:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] The TL074 has changed!</font>
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<div class="PlainText">Mike,<br>
<br>
Would you please share your experiences about the new chip not working <br>
for you?<br>
<br>
Thank you.<br>
Jay S.<br>
<br>
On 8/1/2025 5:23 PM, Mike Beauchamp wrote:<br>
> Last week I received an order of partially assembled prototype PCBs. <br>
> It's a rather large circuit, with the bulk of the IC's being the <br>
> venerable Texas Instruments TL074C that I've been using for 15 years.<br>
><br>
> Compared to the previous boards, I immediately noticed that the power <br>
> consumption was way lower on this batch - from ~16W down to 11.8W, <br>
> definitely significant. That is about 1/4W less power per TL074.<br>
><br>
> After some snooping with the help of people on forums, it seems as <br>
> though Texas Instruments changed fab processes ( <br>
> <a href="https://media.digikey.com/pdf/PCNs/Texas%20Instruments/PCN20221219006.1.pdf">
https://media.digikey.com/pdf/PCNs/Texas%20Instruments/PCN20221219006.1.pdf</a> <br>
> ). The new version has been around for a while as the TL074H, marketed <br>
> as an "improved version", but according to the latest datasheet from <br>
> July 2025 ( <a href="https://www.ti.com/lit/ds/symlink/tl074h.pdf">https://www.ti.com/lit/ds/symlink/tl074h.pdf</a> ) Table 9-1
<br>
> Page 34, the new die is now being used in all of the other TL074s <br>
> (except TL07xM):<br>
><br>
> TL07xH - is the new version<br>
><br>
> TL07xM - will still be the old version<br>
><br>
> TL07xA, TL07xB, TL07xC and anything else - can be either the new or <br>
> old version with no way of telling.<br>
><br>
><br>
> One part of my circuit started working incorrectly with the new <br>
> version, but it was relying on an edge-case near phase reversal. I've <br>
> since revised the circuit to work correctly with the new and old <br>
> versions, but this makes me wonder how the change to this op-amp might <br>
> effect sensitive circuits, or those creative uses we see in synths, <br>
> audio and pedals often. It also seems like the new version has a lot <br>
> more low frequency noise as well.<br>
><br>
><br>
> Thoughts?<br>
><br>
> Mike<br>
><br>
><br>
><br>
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