They still make these? - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: January 15, 2022, 11:13:18 pm
content: https://www.digikey.ca/en/products/detail/texas-instruments/LM3914V-NOPB/212685The good old LM3914 and relatives. I used to play with these in the '80s! With Radio Shack LEDs and breadboards!But what possible use do these things have today?Are there other surprising chips still made today?

author: rsjsouza
author_rank: Super Contributor
timestamp: January 16, 2022, 12:22:41 am
content: Jameco has a very wide selection of these rarities such as its sister deviceLM3915(I still have one original part bought new in the 80's). I think they even have the XR2206.I have no idea who manufactures these, but they are indeed still available.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 16, 2022, 03:46:49 am
content: EOL priced, mind. But yeah, while they're still around...Another way to think of them is a 10-bit unary ADC, with freely adjustable range. So you can use that for a certain amount of ratio conversion, or, I've used them once or twice to drive a power DAC -- ideal for something like an electronic load where most of the power is dissipated in load resistors. By setting REF from VIN, you get an ideal constant current characteristic (minus the steps, that is!).Also the equivalent acquisition rate is 100s kSps -- asynchronous, mind, but it's just an array of comparators, a bit worse than LM393, so a microsecond or so delay. It's not a whole lot of ENOB (10 bits unary = a hair over 3 bits binary) but still interesting to have any result in that kind of time frame, for an ancient analog circuit.Tim

author: BrokenYugo
author_rank: Super Contributor
timestamp: January 16, 2022, 04:29:04 am
content: One of those little 3 terminal TO-92 AM radio chips is allegedly still in production, TA7642.

author: ataradov
author_rank: Super Contributor
timestamp: January 16, 2022, 06:56:07 am
content: Quote from: T3sl4co1l on January 16, 2022, 03:46:49 amI thought so too, but if you look on TI's site directly, the prices are very reasonable. DigiKey is just as always expensive.And the part is active according to TI, so people must buy them. It is also available as a bare die, so there may be some market for that, and the packaged versions are there just because they are easy enough to make.

author: Cyberdragon
author_rank: Super Contributor
timestamp: January 20, 2022, 02:05:47 am
content: Quote from: BrokenYugo on January 16, 2022, 04:29:04 amI've seen those used in kits. Elenco uses them I know (not sure if that exact number, but similar if not)

author: james_s
author_rank: Super Contributor
timestamp: January 20, 2022, 04:02:23 am
content: I wonder if they still make them or just made millions and millions of bare dies that they continue to package? I suppose it's the same process they use for all the 74xx and similar era parts so as long as there's enough collective demand for parts using that process they can run off more of them as needed.

author: johnboxall
author_rank: Unknown
timestamp: January 20, 2022, 05:37:08 am
content: Quote from: Alex Eisenhut on January 15, 2022, 11:13:18 pmLM3914 - Voltmeters. Lots of voltmeters! Education. etc. There's somewhat of a renaissance of digital electronics at the moment as well.We source XR2206 and ICL8038 for local older enthusiasts from China, they work fine. Companies like HG Semi are doing an increasing number of through-hole ICs from 555 to logic and more. Demand must be there.https://lcsc.com/brand-detail/11543.html

author: CJay
author_rank: Super Contributor
timestamp: January 20, 2022, 07:56:58 am
content: Quote from: johnboxall on January 20, 2022, 05:37:08 amHGSemi also do some pretty decent versions of obsolete bipolar RF power transistors, their tech support is helpful as well.

author: mfro
author_rank: Regular Contributor
timestamp: January 20, 2022, 08:30:12 am
content: wouldn't be surprised if there is an ancient military, aerospace or even automotive long term contract they are still obliged to

author: wraper
author_rank: Unknown
timestamp: January 20, 2022, 08:52:50 am
content: Quote from: rsjsouza on January 16, 2022, 12:22:41 amTheir XR2206 are as counterfeit as junk from China. Sort of work but way worse than the real thing.

author: Muttley Snickers
author_rank: Unknown
timestamp: January 20, 2022, 09:32:08 am
content: I noticed a listing earlier today onOzbargainwhich offered the LM3915 in a soldering practice kit for only $1.80, normally $4.49 (USD) fromIC Station. Only a couple of days left at that price so don't delay if you want one.Note: I have no affiliation whatsoever with Ozbargain or IC Station.

author: rdl
author_rank: Super Contributor
timestamp: January 20, 2022, 03:15:36 pm
content: I always thought the LM3915 would make an interesting ammeter, or amp indicator rather, for a power supply. Being logarithmic it would be more sensitive at lower current levels.