[sdiy] DIP LM13700 discontinuation

ShedSynth shedsynth at gmail.com
Sat May 22 12:22:45 CEST 2021


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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