identification of an electronic component - Page 1
Forum section: electronics / beginners

author: Chris_D
author_rank: Regular Contributor
timestamp: November 01, 2021, 10:54:53 am
content: Hi,I'm trying to identify a component in a TO-5 style round package, with the text marked on it: ICL3021TY8419SI. I gather that ICL could stand for Inrush Current Limiter, but I can't find anything on the (other) numbers. I has 8 leads and a tab on the package.Thanks!

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 01, 2021, 11:55:32 am
content: ICL is Intersil, 8419 is the production year and week. 3021 could be a CA3021 that was indeed manufactured by Intersil but it has 12 leads.

author: Chris_D
author_rank: Regular Contributor
timestamp: November 01, 2021, 03:56:26 pm
content: Quote from: PA0PBZ on November 01, 2021, 11:55:32 amOk, I thought first that ICL was an abbreviation of the component, silly me.Maybe I could check with this company if it stills exists.But your saying, production year? so 1984? That is remarkable, I thought this device was much older, but no matter.

author: Chris_D
author_rank: Regular Contributor
timestamp: November 01, 2021, 06:06:49 pm
content: I have the misread the first number, it is an 8.So the marking reads ICL 8021 etc.And it seems to be an low power op amp by Intersil indeed.Thank you very much for pointing me in the right direction.

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 01, 2021, 07:38:39 pm
content: Looks like you found your victim, good work!

author: Chris_D
author_rank: Regular Contributor
timestamp: November 02, 2021, 08:14:17 am
content: Indeed, it is a low power op amp by the way, resembling the famous 741.With a fuse in it. And unfortunately I don't know anything about op amps. I already start trembling when I see a transistor.

author: Gyro
author_rank: Super Contributor
timestamp: November 02, 2021, 09:54:00 am
content: It doesn't have a fuse in it.It has a pin which allows you to set its quiescent power consumption for different applications... Slow (and low power), or faster.Don't be afraid of opamps, they're often easier to use than transistors (for linear applications).

author: Chris_D
author_rank: Regular Contributor
timestamp: November 02, 2021, 08:17:32 pm
content: OkI"ve read the following in the data sheet: 'short circuit protected' , so I was assuming this was a fuse.

author: Chris_D
author_rank: Regular Contributor
timestamp: November 02, 2021, 08:23:59 pm
content: Well, actually need a lot of explanation concerning opamps, because I'm trying to figure one out in a circuit. Well, on a pcb that I'm replicating by drawing by hand now. And what I don't understand first of all is the configuration to create negative voltage. And then in this circuit the output is a PNP transistor, and it seems to end there?

author: Zero999
author_rank: Super Contributor
timestamp: November 03, 2021, 08:24:13 am
content: Quote from: Chris_D on November 02, 2021, 08:17:32 pmIt means it has a circuit which limits the output current to a safe level, if the output is short circuit. It's not a fuse. The op-amp will resume normal service after the short circuit is removed.Quote from: Chris_D on November 02, 2021, 08:23:59 pmWe can't help you without a schematic. If you're trying to reverse engineer a PCB, a photograph would also help.Image processing software can help a lot with reverse engineering PCBs. Take a photograph of each side of the board. Make sure the camera is the same distance from the board and at the same angle. Flip the track side, make it semi-transparent and overlay it on the component side. You might need to rotate and scale the image so it lines up. YouTuber Big Clive did a tutorial on reverse engineering, if you need a demonstration.

author: Chris_D
author_rank: Regular Contributor
timestamp: November 03, 2021, 09:51:52 am
content: Quote from: Zero999 on November 03, 2021, 08:24:13 amYes, I'm trying reverse engineering. I think what I drew is pretty accurate, but, for instance, if I would be able to put it in a program, that provides me automatically with a electrical diagram, that would be be very useful. If such a thing exists. And if it is free.