[sdiy] DIP LM13700 discontinuation

[Ian Fritz]

Yabbit — what if you need to test a dozen or so to select for performance, eg low offset and variation?  There should be ZIF sockets for these!

Ian

> On May 19, 2021, at 7:44 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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