DISPLAY LED EQUIVALENT - Page 1
Forum section: electronics / repair

author: lionelkjh
author_rank: Frequent Contributor
timestamp: June 02, 2025, 02:15:53 pm
content: Hello everyone! I'm looking for an equivalent of the display in the attached photos, because I haven't found anything on the internet... Don't hesitate to let me know if you've found one... Regards

author: Greybeard
author_rank: Frequent Contributor
timestamp: June 02, 2025, 05:30:56 pm
content: What dimensions?Pin-out?Color? (red, orange, yellow...)

author: fzabkar
author_rank: Super Contributor
timestamp: June 02, 2025, 06:00:53 pm
content: Go here ...https://www.sourceresearch.com/StoreWork/CrossList.cfm... and type "XAN" into the "NTE Cross Ref. Search" box.I can see XAN381 and XAN-381, which cross to NTE3055.https://pdf1.datasheet.su/nte/nte3052.pdf

author: lionelkjh
author_rank: Frequent Contributor
timestamp: June 03, 2025, 12:30:07 pm
content: Hello; the LED display is red and I took more precise photos with different angles....Waiting for your research....

author: lionelkjh
author_rank: Frequent Contributor
timestamp: June 03, 2025, 12:32:50 pm
content: And here

author: fzabkar
author_rank: Super Contributor
timestamp: June 03, 2025, 06:15:08 pm
content: Set your DMM to diode mode. Place the black probe on the common cathode pin and then use the red probe to test each of the anodes. The corresponding segments should light up, if only weakly.https://www.eng.auburn.edu/~niuguof/2210lab/data%20sheets/MAN74A_7seg_display.pdf

author: lionelkjh
author_rank: Frequent Contributor
timestamp: June 04, 2025, 10:50:51 am
content: Hello; I have already checked and some LEDs are dead; hence my post... Regards

author: Zenith
author_rank: Frequent Contributor
timestamp: June 04, 2025, 11:34:22 am
content: Your first pictures were terrible and it was hard to make out anything. You didn't supply the basic information Greybeard requested, dimensions etc. fzabkar found a datasheet for what looks like a Fairchild equivalent, probably long out of production.Armed with what you know now, go and look through the Digikey, etc catalogues and find a replacement. Have a look at the displays you have, in good light, and make sure they are all the same. e.g. the left hand one might display + or - and 1.

author: squadchannel
author_rank: Frequent Contributor
timestamp: June 04, 2025, 12:39:03 pm
content: I will check later, but the original would be manufactured by hp. It would be the same as the one used in the 4261A.

author: squadchannel
author_rank: Frequent Contributor
timestamp: June 05, 2025, 12:07:33 am
content: 4261A is 1990-0434. 0.3” character height.It is probably a common cathode, given the pinout.Digikey,https://www.digikey.com/en/products/filter/led-character-and-numeric/92?s=N4IgjCBcpgbFoDGUBmBDANgZwKYBoQB7KAbRAE5YAOWAZhAMpoBYHwQBdAgBwBcoQAZV4AnAJYA7AOYgAvgVgB2BCGSR02fEVIhalWAFY2ELiD4Dh46XIIAmAAzkVajbgLFIZWrVu1FR03NIIVFJGXldMAhoVVRMN21PcCowW2UCMBTbKmMqPxyMvKpWQvIqdPB-cnoMxVsHYzqwZUD%2BYMswmxAAWltnKFEAVy0PMgCI7qcYtSGRnRNZRaA

author: lionelkjh
author_rank: Frequent Contributor
timestamp: June 06, 2025, 04:05:24 pm
content: Hello; thank you for this precise research!

author: hanakp
author_rank: Regular Contributor
timestamp: June 06, 2025, 07:50:00 pm
content: Your photos reminded me of Czechoslovak-made LQ410 displays. They look like this:http://racvonka.cz/nahl/10718.jpgHere is their datasheet:https://www.teslakatalog.cz/LQ410.htmlI still have a few unused ones, but of course these old displays were so dim (less than 1 mcd at If = 20 mA) that nobody uses them anymore.

author: floobydust
author_rank: Super Contributor
timestamp: June 06, 2025, 08:06:43 pm
content: The original Monsanto LED displays MAN7x released in 1975 (~$20 each in today's dollars) and they became a standard for the DIP package, pinout and 0.3" character size etc. which many manufacturers have copied. Many companies make a compatible part.The old originals were quite dim, by today's standards.