[sdiy] DIP LM13700 discontinuation

[chris]

On Wed, 19 May 2021 09:11:28 -0500 Pete Hartman <pete.hartman at gmail.com> wrote:

> Repairs.

Um, assuming synth chips are not dying like flies, I can live with some
occasional improvisation for repairs.
I just happened to reactivate a dead OB-8 this week, which had a blown
DAC. Of course it would have been nice to just put in something
compatible, but I was more than happy to kludge something with a
currently available DAC.

> As already pointed out, breadboard work.

Ok, that may be more valid to others. 
I never liked breadboarding - for decades, I rather made a
quick'n'sloppy PCB for a first test.

> The skill of soldering smd well is *different* from soldering through hole
> well.  Easier or not this is still a concern to a lot of people who don't
> have that experience with smd.

Well, as a beginner, people without any soldering skills do have to take
a first step. It may be just a different step (as you said).

> 
> Pete
> 
> 
> 
> 
> 
> On Wed, May 19, 2021 at 8:46 AM chris <chris at chrismusic.de> wrote:
> 
> > 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_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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