[sdiy] DIP LM13700 discontinuation

Mon May 24 11:18:30 CEST 2021

Steve has already commented it so nicely, I just want to add a little.

First of all it's good you want to do anything with electronics at all 
and not spend all day wiggling a phone. If it's SMD or DIP is not a 
showstopper IMHO, all doable at home. There are also salvaged parts, you 
can make huge stock of parts by disassembling old disposed equipment. As 
a free bonus your soldering skills will improve.
About your fat chisel tip - don't assume SMD needs thin tips. Most of 
the time I use 2mm wide chisel for SMD, sometimes 5mm wide.

This is a good way of distraction from survival between paychecks, keep 
it up. It's fun with lots of specialized tools and materials, but it's 
even bigger fun with improvised minimal setup.

Roman

W dniu 2021-05-22 o 15:07, Benjamin Tremblay via Synth-diy pisze:
> I can accept that things are changing. But, the loss of through-hole larger components is a loss for me. I can adjust, but it is a loss.
> 
> I don’t have much money for electronics. My purchases come in drips. $15 or $8 here and there. I’m using a fat chisel tip on my soldering iron because I don’t have budget for a new set of tips. I’m low on solder.
> I’m not going to have capital for tools and pcb fabrication. I never will. I use what I can get, and that’s how I will carry on. I do happen to have a cheap soldering microscope, but no nifty tools to make smt convenient. I was able to tack a ram chip onto my Teensy the stupid way and I know every time I do it that way I roll the dice to see how many times I have to do-over until all the pins are properly connected.
> Electronics will never be about gear or toys or well-stocked shelves above my tidy workbench. It’s how I distract myself while doing the calculus of survival between paychecks.
> 
> Benjamin Tremblay
> 
>> On May 22, 2021, at 8:50 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
>>
>> 
>> In my opinion, trustworthiness of the source, primarily.
>>
>> On eBay, you’re buying a chip. It might have the right number of legs. It might be marked with the right writing. It might even be the right chip. But that’s definitely not always the case.
>>
>>
>>> On 22 May 2021, at 11:22, ShedSynth via Synth-diy <synth-diy at synth-diy.org> wrote:
>>>
>>> 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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>>
>>
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