[sdiy] DIP LM13700 discontinuation

Wed May 19 19:29:11 CEST 2021

I like these DIP to SOIC adapters for prototyping on a breadboard, or for retrofitting SMT parts into through hole boards: https://www.sparkfun.com/products/13655. The related items feature boards for pins with all sorts of pin counts.

Though I too think SOIC isn't any harder to deal with than through hole, and can be dead-bugged pretty easily as well when the adapters aren't available. Maybe fewer people into DIY have SMT soldering experience, for now, but no one starts out knowing how to solder anyway, and these are skills that are learned and incrementally improved. And at that scale, the rework is also not hard, and I think it's far easier to actually properly desolder SMT parts than through hole.

It is a shame though - that chip is so ubiquitous in so many designs. That will make things more difficult, but the pinout is the same for both the surface mount and through hole, so at least using the adapter boards it should be plug and play with just an additional step.

-boris

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Wednesday, May 19th, 2021 at 1:08 PM, Chris Juried via Synth-diy <synth-diy at synth-diy.org> wrote:

> Lol, this post made my day.
>
> Sincerely,
>
> Christopher Juried
>
> https://juriedengineering.com/
>
> FCC Licensed RF Coordinator
>
> Audio Engineering Society (AES) Member
>
>> On Wed, May 19, 2021 at 12:34 PM, info synthcube.com
>> <info at synthcube.com> wrote:
>> Yes, 'dark' represents the existential opposite of electrons and the light they can produce (their anti-being) so naturally there's a deeply ingrained terror. As a result of these new insights we are thinking about designing a line of electron-friendly DIP ICs that are transparent, and also have a number of holes drilled through them to help the acoustics. I haven't yet seen a scope that can measure and display electron comfort and happiness but clearly one is needed to silence the doubters.
>>
>> Monika
>>
>> synthCube
>>
>> -----Original Message-----
>> From: Synth-diy <synth-diy-bounces at synth-diy.org> On Behalf Of chris
>> Sent: Wednesday, May 19, 2021 10:21 AM
>> To: synth-diy at synth-diy.org
>> Subject: Re: [sdiy] DIP LM13700 discontinuation
>>
>> 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_20210512
>>> > 12
>>> > 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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>>
>>>
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