Help identifying these possibly RF/Microwave components? - Page 1
Forum section: electronics / beginners

author: cincin
author_rank: Regular Contributor
timestamp: April 23, 2024, 04:17:30 am
content: I'm sorting through some components I got from an estate sale, possibly RF/Microwave related. Some of it dates back to the 1980's, some of it is Soviet. There's a couple of pieces that I can't find anything about (on Google or Google Lens), and I'm hoping some of you would know:TriQuint G894A 240.0 - These are tiny cubic components. My best guess is crystals?? and the 240 is Mhz? They come in different values from 229 to 240.K1KT682Ƃ ?K248ЛП1Ƃ ??142EH2E ?Are these still useful / relevant today in North America? (toss, give away, sell?)Thanks!

author: Odd-Job
author_rank: Unknown
timestamp: April 23, 2024, 05:59:09 am
content: Some of them look Russian to my eyes. The TriQuint box says 39 part, probably cut from a wafer, might be I.C.See if you can track down data sheets, people on ebay would likely be interested, if not you could try recovering the >>95% gold from them.

author: xvr
author_rank: Frequent Contributor
timestamp: April 23, 2024, 09:34:48 am
content: Last 3 definitely from USSR. First is some form of transistor set (I think). Second - some logic (not event TTL), last - voltage regulator. Some like 78xx, but more ancient.I'l try to find some infoК1КТ682Б (From 1975 year!)They are a transistor assembly for radio equipment and electronic devices and industrial equipment. Coordination of digital and analog systems in multi-channel data transmission and processing systems in various industrial equipment with tunable electrical characteristics.К249ЛП1Б (more or less modern)Logic signal switches K249LP1B, optoelectronic, consisting of a gallium arsenide emitter, a silicon photodiode and an integrated amplifier that provides digital voltage levels at the output for collaboration with TTL microcircuits. Designed for use in general purpose electronic equipment as optocoupler switches - inverters.142ЕН2Б (ancient)142ЕН2Б chip are compensation-type voltage regulator with an adjustable output voltage of positive polarity 12... 30 V and a load current of 150 mA.They have short circuit and overload protection and a remote shutdown circuit using an external signal.An external divider is used to regulate the output voltage.To improve stability, a pin is provided to connect the internal reference voltage to an external power supply.Designed to operate in secondary power supplies for special-purpose radio-electronic equipment.Analog of A723

author: cincin
author_rank: Regular Contributor
timestamp: April 23, 2024, 05:16:11 pm
content: Amazing! Thank you. Did you find the datasheet for those? Where did you get that juicy info? I looked everywhere.The TriQuint boxes are definitely cut from wafers, there's a wafer # on the label. The datasheet is what I'm ultimately hoping to find. I have several packs that range from 229.0 to 240.0Part of the lot were some partly assembled prototype PCBs that appear to be all gold with gold wires and ground planes, but even so I doubt I have enough to justify a gold recovery operation. It's all pretty small stuff.Cheers!

author: xvr
author_rank: Frequent Contributor
timestamp: April 23, 2024, 05:23:58 pm
content: > Where did you get that juicy info?In a Russian segment of Internet> Did you find the datasheet for those?К1КТ682Б - 4 transistors. No any data, no datasheet. In 1975 there is no datasheets in USSRК249ЛП1Б - Have DS in Russia (scan from paper sheet). Attached (both original and translated)142ЕН2Б - No DS. May be DS from analog will match.

author: cincin
author_rank: Regular Contributor
timestamp: April 23, 2024, 05:30:29 pm
content: Well done! I appreciate you taking the time to look it up and translate for me.

author: xvr
author_rank: Frequent Contributor
timestamp: April 23, 2024, 05:37:51 pm
content: I found info for К1КТ682Б (aka К168КТ2Б)http://www.tehnari.ru/attachments/f156/67477d1329461233-k168_1.jpghttp://www.tehnari.ru/attachments/f156/67478d1329461287-k168_2.jpgBoth in Russian, but it has schematic for it (no translation required)Translation in attach

author: xvr
author_rank: Frequent Contributor
timestamp: April 23, 2024, 05:46:44 pm
content: 142ЕН2Only Russian DS (Google rejected to translate)

author: cincin
author_rank: Regular Contributor
timestamp: April 23, 2024, 06:31:14 pm
content: Amazing! ty!

author: cincin
author_rank: Regular Contributor
timestamp: April 24, 2024, 06:14:43 pm
content: Well, I put the unsealed TriQuint pack under the microscope, and it looks like tiny PCBs with antennas? Custom dies? ChatGPT tells me they are likely Microwave Planar Resistors, 240.0 would be 240 Ohms.Cheers!

author: xvr
author_rank: Frequent Contributor
timestamp: April 24, 2024, 06:28:46 pm
content: No, it's definitely something more complex, than just resistor.

author: cincin
author_rank: Regular Contributor
timestamp: April 24, 2024, 06:32:31 pm
content: I was thinking maybe a resistor array with many connections / resistive paths, but now it looks like they may be bare dies, possibly custom, for some RF process, and the spirals would be spiral inductors.Are these likely to be of any use to anyone? Seems rather specific and custom.

author: xvr
author_rank: Frequent Contributor
timestamp: April 24, 2024, 06:41:10 pm
content: I have no idea.May be ask in RF forum section -https://www.eevblog.com/forum/rf-microwave/?

author: arlo_g
author_rank: Contributor
timestamp: April 25, 2024, 01:34:26 am
content: That's a nice microscope image, Cincin. It looks like there might be edge contrast in the image: do you have Darkfield or Nomarski/DIC fitted on your microscope?As for the TriQuint chip, those spirals look like integrated inductors to me. That wouldn't be a big stretch on TriQuint's traditional GaAs substrates. Based on the number of inductors, and the shortage of clearly single-ended signal pads, my guess would be that this is a tuned RF circuit. Maybe an oscillator, mixer, frequency doubler or reactively matched switch/ switched reactive components?

author: cincin
author_rank: Regular Contributor
timestamp: April 25, 2024, 02:35:41 am
content: Thanks, I wish!That's a vanilla photo from my cheapo AmScope SM-4T @ 45X (with the 1 megapixel USB camera, 20x 640x480, and the LED ring light). It does do a pretty good job if you get a good one, but I'm afraid the "enhanced" edge contrast look may be a result of chromatic aberrations in this case.I've been posting about the TriQuint on several platform, and the consensus seems to agree with you. People are saying oscillators, mixers, or amps mostly.Unfortunately it sounds like they're not much use to anyone, though the guy from The Signal Path YouTube channel seemed interested in playing with them.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 25, 2024, 04:52:30 am
content: The diversity of spirals suggests tuned RF inputs; perhaps it's a mixer, with LO, RF (left, up/down take your pick) and IF (right). Seems differential, and I wonder if the thin traces connecting pad pairs might be diffusion resistors for termination.Would need better photos -- or more destructive testing, i.e. etch the oxide and top metal layers off -- to see what kind of functionality is underneath. Could well be some GaAsFETs or schottky diodes on there.Tim

author: kevin.gibbs
author_rank: Regular Contributor
timestamp: April 25, 2024, 01:11:43 pm
content: Yes, some of them are old Soviet parts. I have seen such parts in ancient devices manufactured about 40-50 years ago.

author: radiolistener
author_rank: Super Contributor
timestamp: April 25, 2024, 01:45:54 pm
content: Last 3 are soviet military grade IC, they had strong quality control and testing and have good reliability and mechanical endurance. They are using gold plated pins and metal-ceramic housing.But letter "K" at the beginning was used for marking general purpose IC, probably this is rejected military grade which is passed quality control for general purpose usage.Soviet military grade components have ◊ symbol in its marking. So the last one has successfully passed military grade quality control.And other two are produced the same as military grade, but didn't passed military grade quality control.