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I've used that company's 5532 and it was fine - met all the specs of the original. As Neil said they are probably just absolute copies of one version or another. There's a company in Singapore which will take any chip and strip away the layers so as to produce
an exact set of masks (and a schematic);</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 Mike Beauchamp <list@mikebeauchamp.com><br>
<b>Sent:</b> 13 June 2023 23:13<br>
<b>To:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> [sdiy] Another LM13700?</font>
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<div class="PlainText">Just came across this today:<br>
<br>
<a href="https://www.lcsc.com/product-detail/Operational-Amplifier_HGSEMI-LM13700M-TR_C5160094.html">https://www.lcsc.com/product-detail/Operational-Amplifier_HGSEMI-LM13700M-TR_C5160094.html</a><br>
<br>
No clue what the deal is with them, and the price isn't much better than <br>
ordering direct from TI. But could this be another actual manufacturer <br>
of this chip? Might be nice for those like me that love and rely on this <br>
part #.<br>
<br>
<br>
Mike<br>
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