[sdiy] DIP LM13700 discontinuation

[chris]

Aah, I see. 

Thinking at that level also explains why tubes are better. Most probably
electrons are afraid in the dark. And now adding their claustrophobic
nature to that...

Chris



On Wed, 19 May 2021 13:56:22 +0000 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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