[sdiy] DIP LM13700 discontinuation

Tom Wiltshire tom at electricdruid.net
Sat May 22 14:44:03 CEST 2021


In my opinion, trustworthiness of the source, primarily.

On eBay, you’re buying a chip. It might have the right number of legs. It might be marked with the right writing. It might even be the right chip. But that’s definitely not always the case.


> On 22 May 2021, at 11:22, ShedSynth via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> What are the practical differences between the TI/CoolAudio LM13700 and eBay
> items like these which still appear to have stock?
> https://www.ebay.co.uk/itm/162776473998
> https://www.ebay.co.uk/itm/172160273446
> 
> Thanks,
> Al
> 
> -----Original Message-----
> From: Synth-diy <synth-diy-bounces at synth-diy.org> On Behalf Of
> mskala at ansuz.sooke.bc.ca
> Sent: 19 May 2021 13:07
> To: synth-diy at synth-diy.org
> Subject: [sdiy] DIP LM13700 discontinuation
> 
> It seems Texas Instruments is discontinuing the LM13700N - that is the DIP
> version of the part.  Mouser lists it as "End of Life" and links to this
> discontinuation notice dated May 12, 2021, with the last order date May 12,
> 2022:
> 
> https://www.mouser.com/PCN/Texas_Instruments_PCN20210505000_2021051212340278
> .pdf
> 
> I haven't been able to find this notice on the TI Web site, which still
> shows the product's status as "active," including the DIP version.
> 
> CoolAudio makes a 13700 clone and their data sheet describes both DIP and
> SOIC versions, but the DIP seems to be a unicorn.  CoolAudio doesn't sell it
> on their Web site, neither do any distributors, and a Web search for the
> purported part number of V13700D only turns up the data sheet.  I don't
> believe it really exists in any way accessible to hobbyists.  Maybe they'd
> make it for you if you ordered a million units.
> 
> A Chinese manufacturer called "XinLuDa" offers a DIP dual operational
> transconductance amplifier called the XD13700, available through LCSC, which
> seems to be a clone; I don't know how faithful it is or isn't.  They do note
> in their data sheet that there are differences in the buffer units between
> the XD13700 and XL13700 (which is their own surface-mount version of a
> similar part).  Interestingly, they claim that the DIP version is better -
> in which case why make them different at all?
> 
> Alfa offers a 3280 clone (data sheet says both DIP and SOIC, but the Web
> site only lists the SOIC); and something called the AS13704, which is a
> 13700-like OTA in a quad instead of dual configuration, and only in SOIC.
> Neither can directly replace a DIP 13700.
> 
> I think the 13700 may be a bellwether for through-hole packages in general.
> As basically the last OTA to be available in a through-hole version from a
> major manufacturer, it has a big share of the market for through-hole analog
> electronics.  If it makes sense to discontinue this product, that means the
> market in question is now too small to be worth serving anymore, and that
> assessment will be applied to other products too.  Memento mori.
> 
> --
> Matthew Skala
> mskala at ansuz.sooke.bc.ca                 People before tribes.
> https://ansuz.sooke.bc.ca/
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