[sdiy] [OT] LM13700 spotted in commercial product of big Manufacturer

Mike Bryant mbryant at futurehorizons.com
Mon May 16 11:55:05 CEST 2022

From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Roman Sowa

> There are still opamps being made in bipolar process and they are made in milions. I don't think anybody would close such a fab just because it's old process. The staff there has changed many times already, and knowing how corporations work today > it's clear that using all the equipment is based solely on written procedures, and not any human memory. All those opamps are 40 years old if not older and they still sell in milions.

It's interesting to look at small Chinese manufacturers like 3Peak, Cosine, Gainsil, HGSemi, Xilluda, YW and a few others.  They all started with clones of the TL07x and 5532 but nowadays they are focusing more and more on the 5V or 12V single supply market, with several of them totally dropping 36V opamps.   Another notable point is I've never seen any OTA from any of them, even though they would be easy to clone, which tends to indicate the market for OTAs was never that large outside of audio and so cloning is left to audio specialist IC companies.

> We have talked already a year ago here about the H series and why it didn't get it's own new number. Nevertheless the old TL072C is in stock in impressive quantity, possibly not planned to dissapear in years.

Actually both the proper TL072 and TL074 were almost unobtainable late last year in SOIC.  No idea about DIP.  Seems to be better now but prices still almost double what I used to budget for, with 5532s almost triple, apart from one Chinese manufacturer.

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