[sdiy] DIP LM13700 discontinuation

[John Luciani]

Be careful about letting the marketing folks hear this -

  The superior sound is attributed to the patent-pending usage of
cage-free, farm-fresh, free-range electrons. Only
  happy and healthy electrons can produce such rich and full sounds ;)

John L

On Wed, May 19, 2021 at 9:57 AM info synthcube.com <info at synthcube.com>
wrote:

> Electrons are all the same size, so when you stuff a certain quantity of
> them through a semiconductor, things change depending on the size of the
> semiconductor. DIP parts allow for electron comfort and space as they pass
> through, and legacy synth designs are based on that model. Stuffing
> electrons into those tiny SMT packages stresses them out,  and thins out
> and strains the associated sounds. You lose that rich, long-pin,
> big-package tone. Long live the LM13700 and DIP
>
> Monika
>
> synthCube
>
>
> -----Original Message-----
> From: Synth-diy <synth-diy-bounces at synth-diy.org> On Behalf Of chris
> Sent: Wednesday, May 19, 2021 9:42 AM
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] DIP LM13700 discontinuation
>
> Hmm, I don't understand why people are dogmatically sticking to DIP.
>
> Soldering SO is a piece of cake. Even my 60+ years old eyes and fingers
> have no problems with SO. It's not as if it were 0.4mm pitch or BGA.
>
> Or is it the old wives' tale that the holes make it sound better?
> Like f holes on a violin...?
>
> Chris
>
>
>
> On Wed, 19 May 2021 08:06:59 -0400 (EDT) mskala at ansuz.sooke.bc.ca wrote:
>
> > 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_2021051212
> > 340278.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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