LM13700 End of Life

I have heard that the LM13700 is going to be discontinued soon, and is EOL. Thought since we have a lot of modules reliant on upon it, it would make sense to start a discussion about alternatives.

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Bad news. But it appears it’s not the LM13700 generally, it’s the LM13700N DIP version. Mouser shows no similar message for the SOP-16 LM13700M.

Alternatives? If you look on Mouser for All Products > Semiconductors > Amplifier ICs > Transconductance Amplifiers in stock the 13700N is the only through hole one listed.

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Yeah - saw this (as well as Monty Python skits) fly by on the synth-DIY list.
I have to agree with whoever it was on there saying “put the SOIC ones on a breakout board”.

Cheers

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I’ll never understand why companies don’t offer a suggestion for a replacement part when one is planned for obsolescence…

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Yeah, @moritzklein mentioned it in his stream. I presume folks will just use some to dip adapters if they need to use a 13700. Quick, start stockpiling now! :grinning:

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yeah thats where i saw it.

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putting or finding breadboarded soic lm13700 would be a find or a deal to buy from. Alot of older chips are doing that as we speak.

As I understand it, the LM13700 was designed as basically two RCA (later Intersil) CA3080s in a single package. The latter chip went out of production around 2000, I think? But now Rochester Electronics produces a through hole CA3080, and Alfa makes the AS3080. Neither’s cheap (the Alfa is $4.99 from SynthCube, the Rochester is $3.89 with minimum quantity 65 at DigiKey) but they’re available. Presumably it’d be relatively quick and easy for both companies, if they chose, to make versions of the LM13700N. Assuming there are no legal impediments to doing so, I’d be surprised if Alfa at least isn’t working on that right now.

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There are some minor differences between the 3080 and the 13700, but Alfa already has a quad 13700 version so as you say, it’d be surprising if they don’t roll out an AS13700.

Rochester only packages existing wafers, though, so if they will be able to supply new ICs depends on TI.

EDIT: Turns out Rochester has some LM13700 stock, and at a nice price too, if you’re ok with their minimum order size :slight_smile:

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I checked a couple of Chinese distributors (LCSC, Chipsmall) and they have a preorder page for a DIP-16 “LM13700M” from a Chinese manufacturer (Gcore) that makes a bunch of other classics as well. No datasheet on the sites yet, www.gcore.com.cn gives me a 403, and LCSC has it categorized under “batteries,” but a bit more Googling brought up a Chinese-language datasheet in Google’s cache, and it’s definitely an OTA.

EDIT: To continue a bit further down this Chinese OTA rabbit hole, I found Gcore’s 1688 store: https://shop1473055479092.1688.com. No 13700 there (yet?).

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chipsmall.com says it’s not a battery. They illustrate it with an SOP-16 package but who knows.

Ok, I may have missed it before but there’s now an LM13700m in the the Gcore store’s index. The link is dead, though.

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Looks like Tayda just got new stock, they have 2339 of them available.

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Maybe we can get this guy to design us an LM13700 substitute

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Wow. Just noticed Tayda’s charging $3.99 for an LM13700N. About twice what they were charging a few months ago.

And $1.37 more than Mouser!

Strange times.

At least they have it. Digi-Key doesn’t.

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I haven’t tried this yet, but there is a way to make them from ic4007 CMOS ic’s.

https://wiki.analog.com/university/courses/alm1k/alm-lab-ota

I know it’s not compact and can’t say anything about performance, but it is already cheaper, and 4007s will probably not run out soon :slight_smile:

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