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So we've been manufacturing Nixie Clock kits for the last few years, and for the multiplexers we used 74141 ICs, or their Soviet clones (К155ИД1). The latter were easier to find on ebay and were used more commonly. These chips have a date code like "8910" which I assume to mean year 1989, week 10.

Since this is all NOS (New Old Stock), I've made a 74141 tester to verify incoming batches.

I received the latest batch of chips yesterday and to my surprise about 1/3 of them failed the tests. Then I noticed that these new chips were visibly different: the plastic package is more edgy, there's some sort of manufacturer logo, and their date code is "1814"!

Compared to an old one at the bottom right:

К155ИД1 - new and old versions

I later verified that the new chips work on actual nixie clocks, but my tester rejects them for some minor reason (probably the new ones are a bit more sensitive to supply voltage, they also seem to be consuming a tad more current).

Questions:

  1. Which manufacturer is this?
  2. Is it really possible that these ICs from the sixties have just made a comeback?

The practical upside of this is that we'd be curious to contact the new manufacturer directly, to cut the ebay middlemen.

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    \$\begingroup\$ Nixie clocks? New ones? \$\endgroup\$ – K.A Feb 8 at 23:16
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    \$\begingroup\$ yeah, I initially just wanted to build a nixie clock for myself, but people liked it and we turned it into a product. \$\endgroup\$ – anrieff Feb 9 at 0:09
  • \$\begingroup\$ Can you let me know? \$\endgroup\$ – K.A Feb 9 at 14:51
  • \$\begingroup\$ @k.a: daliborfarny.com \$\endgroup\$ – alk Feb 9 at 15:20
  • \$\begingroup\$ @K.A write me at «my username» at gmail dot com. The Czech ones are gorgeous, but hyper expensive. \$\endgroup\$ – anrieff Feb 9 at 16:32
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The chips that you have are made in Belarus by a company named Integral.

  • К155ИД1 1814 :- This is a recently manufactured chip. (i.e. 14th week of 2018).
  • К155ИД1 8910 :- This chip is very old (i.e 10th week of 1989).

Link to the site of manufacturer.

Yes, it might be possible that the manufacturer is using a slightly modified architecture based on the previous one for the manufacturing of these new chips

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  • \$\begingroup\$ Searching on their website for the part number doesn't seem to turn anything up. \$\endgroup\$ – Peter Green Feb 8 at 22:27
  • \$\begingroup\$ @PeterGreen see here (their official website, found by Google with the site: keyword) and here (popular electronics store) \$\endgroup\$ – undercat Feb 9 at 6:07
  • \$\begingroup\$ @undercat the link redirects me to the main page. This one works: integral.by/ru/products/ttl-seriya-k155-ekf155/k155id1 BTW their web certificate expired yesterday 2019-02-09. \$\endgroup\$ – pabouk Feb 10 at 17:20
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You have К155ИД1 1814 chips made in Belarus see this. Company name is Integral.

К155ИД1 8910 is a very old chip made in 1989. Unfortunately, these old chips are hard to find. The Soviet Union made excellent chips; now you need to carefully verify the modern versions.

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Consider the possibility that the chips inside these packages are NOS, from 1989 or whenever, but had been stored as bare dies, and have been bonded and packaged in 2018. Which would make a lot of sense if somebody has a stash of bare dies - you could put them in ROHS-compliant packaging. Coincidentally, the pin finish on these does look rather matte, typical of lead-free components...

Alternatively, the parts might be old stock that someone retested, refurbished, remarked and remarketed in 2018.... there might be the more sinister possibility that they have been just remarked, in order to avoid ROHS-related suspicion :)

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    \$\begingroup\$ I thought so, but they seem to be a bit different as far as characteristics go, which seems to suggest they aren't 1:1 the same. I have a microscope and if I have the time I'll delid one old and one new, to compare the chips themselves. \$\endgroup\$ – anrieff Feb 10 at 9:39
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    \$\begingroup\$ The neonixie page shows photos of russian '141 with a date code suggesting 2006 manufacture. .... Could we be dealing with '145s bonded differently here? \$\endgroup\$ – rackandboneman Feb 10 at 10:36

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