Vintge ic identification  - Page 1
Forum section: electronics / projects

author: longboard1210
author_rank: Contributor
timestamp: April 11, 2023, 03:25:34 pm
content: Hi Folks need a lil help have come across some strange ic packagesPlease move this topic if its not in the correct place!The ic apear to be the die alone with the bonds coming striaght out from the dieI would love to know was this a actual package type and its name and if these we pre production trials before spinning a full scale icthe test? sockets i have are very complicated parts having 3 sperate parts to make them work

author: Kim Christensen
author_rank: Super Contributor
timestamp: April 11, 2023, 03:41:00 pm
content: Maybe post a picture of this part?

author: Kim Christensen
author_rank: Super Contributor
timestamp: April 11, 2023, 03:55:36 pm
content: Those are flatpack ICs.

author: inse
author_rank: Super Contributor
timestamp: April 11, 2023, 06:17:59 pm
content: As far as I know this has been state-of-the-art of high integration in the 60‘s and 70‘s.Put them in a nice picture frame:-)

author: longboard1210
author_rank: Contributor
timestamp: April 11, 2023, 07:43:13 pm
content: Thanks i have a few of them lol

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: April 11, 2023, 08:07:44 pm
content: shinywanna sell some of that vintage goodness?

author: coromonadalix
author_rank: Super Contributor
timestamp: April 11, 2023, 08:20:26 pm
content: wuuutwhere did you get this / thesesthat's a big treasure ? even some socket too ?don't know if there is a vintage forum somewhere ?Aviation ?space ?computer ?You have a thread here about chip die picture(s) , send a few to them, they could figure out what they are ??

author: Kim Christensen
author_rank: Super Contributor
timestamp: April 11, 2023, 10:56:50 pm
content: Didn't feel like looking through all these Plessey PDF docs, but there might be some info on some of the parts you have:http://www.bitsavers.org/components/plessey/

author: inse
author_rank: Super Contributor
timestamp: April 12, 2023, 04:17:30 am
content: Let us know what you found out, please.

author: longboard1210
author_rank: Contributor
timestamp: April 12, 2023, 02:54:58 pm
content: Had a looke every where but cannot find early enough datasheets,i guess at the time these parts were classed as company secrets?

author: Kim Christensen
author_rank: Super Contributor
timestamp: April 12, 2023, 03:36:58 pm
content: They might be custom chips...Or be ordinary Plessey chips rebadged with custom numbers.

author: Bud
author_rank: Super Contributor
timestamp: April 12, 2023, 04:45:52 pm
content: Look engineering samples to me. Some have handwritten markings.

author: Kim Christensen
author_rank: Super Contributor
timestamp: April 12, 2023, 08:00:10 pm
content: Maybe send a few samples to Noopy. He does a lot ofdecapping of ICs as shown hereand elsewhere. If the chip is simple enough, you may be able to figure out what it does.

author: Terry Bites
author_rank: Super Contributor
timestamp: April 13, 2023, 05:17:18 pm
content: www.vintage-radio.net/forum/showthread.php?t=125731

author: jonovid
author_rank: Super Contributor
timestamp: April 13, 2023, 07:48:14 pm
content: you struck goldPlessey Company plc was a British electronics, defence and telecommunications company. It originated in 1917send one or two to Dave's mailbag so can do some reverse engineering. for a pinout.I am guessing that this lot is transistor–transistor logic.having seen similar chips in a first gen 1960s electronic calculator on a youtube video

author: MarkS
author_rank: Unknown
timestamp: April 13, 2023, 08:51:01 pm
content: Quote from: Alex Eisenhut on April 11, 2023, 08:07:44 pmOff topic, but thank you!That made me laugh! I love prairie dogs and that's their typical personality captured.

author: moffy
author_rank: Super Contributor
timestamp: April 13, 2023, 11:39:49 pm
content: When I worked in the UK for a defence contractor we used a similar package for a customised hybrid part, basically a high voltage dual precision current source.