I haven't found this inductor for a long time. Do you know it? - Page 1
Forum section: electronics / beginners

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 05:04:58 am
content: I haven't found this inductor for a long time. Do you know it?

author: Terry Bites
author_rank: Super Contributor
timestamp: October 08, 2021, 01:34:47 pm
content: Its very likely a 470uH indcutor. What's it from? Measure the dimensions and the DC resistance. Usually only the DC reistance at the right indcutance matters. There will be many candidates.tryhttps://www.digikey.co.uk/en/products/filter/fixed-inductors/71?s=N4IgjCBcoEwAwA4DsVQGMoDMCGAbAzgKYA0IA9lANogAsArHAAQB2AEiKTUkwK3sC6pAA4AXKCACqzAJYiA8pgCyhbPgCuAJ0IgAvjtJ1UIIVBjCTkGHT1A

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 02:05:29 pm
content: I can't measure it because it was accidentally damaged by the tip

author: dmills
author_rank: Super Contributor
timestamp: October 08, 2021, 02:09:50 pm
content: More likely 47uH then 470uH (Which I would expect to be labelled 471 in these).

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 02:10:05 pm
content: I want to replace it now, but I can't find the same model, because I can't measure any value at present. I can only rely on this picture to judge the model selection.

author: wraper
author_rank: Unknown
timestamp: October 08, 2021, 02:10:57 pm
content: Should be 47uH not 470uh, and you did not even provide dimensions or say where it's used.

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 02:11:15 pm
content: It's probably 47uh. There's line 1848 below. I don't quite understand what it means.

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 02:21:51 pm
content: I made some simple marks. The device "470 1848" is next to the brake terminal, and then I made some simple marks nearby. In the picture, I marked two question marks, of which the yellow one should also be an inductor, but the blue one, I don't know what it is. Then will this "470 1848" be a "power inductor"?

author: timenutgoblin
author_rank: Regular Contributor
timestamp: October 08, 2021, 02:33:04 pm
content: The inductor looks like Würth Elektronik power inductor 47µH. 1848 might be the date code (2018, week 48). It could be a batch number.It looks like this one:https://www.distrelec.biz/en/we-lhmi-smd-power-inductor-47uh-45a-3mhz-330mohm-wuerth-elektronik-74437349470/p/30185122

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 02:40:52 pm
content: Thank you very much for your guidance. I felt the same way at first. I checked many similar products on mouser, but unfortunately, how to determine the specific value, such as:“Maximum DC Resistance”“Rated Current”“Self-Resonant Frequency”These should be important!

author: timenutgoblin
author_rank: Regular Contributor
timestamp: October 08, 2021, 03:36:07 pm
content: Measure the physical dimensions of your inductor before getting a replacement.Check here for examples:https://www.digikey.com.au/en/product-highlight/w/wurth-electronics/we-lhmi

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 04:12:48 pm
content: Is it possible to determine which model just by physical size?

author: radiolistener
author_rank: Super Contributor
timestamp: October 08, 2021, 06:43:10 pm
content: Quote from: Benjam on October 08, 2021, 05:04:58 amThis is inductor 47 uH

author: wraper
author_rank: Unknown
timestamp: October 08, 2021, 06:50:17 pm
content: Quote from: Benjam on October 08, 2021, 04:12:48 pmNo. But as minimum you need an inductor of the same size. SMD power inductors of the same size usually have more or less similar ratings. You have a better chance finding exactly the same part by it's looks when you know what you are looking for, catalogs have filters. Not to say it's quite safe to chose an inductor with one of the highest current ratings for its size and inductance, and use it as substitute.

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 07:43:07 pm
content: you are right

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 07:47:06 pm
content: Quote from: wraper on October 08, 2021, 06:50:17 pmthe size value is:Length: 11.00mmWidth: 9.93mmHeight: 4.00mm

author: Benjam
author_rank: Regular Contributor
timestamp: October 08, 2021, 07:49:54 pm
content: So, by filtering through length, width, and height, I get these results:https://www.mouser.com/Search/Refine?FS=TRUE&N=4294627068+4294638967+4292861026+4292894102+4292906361

author: Terry Bites
author_rank: Super Contributor
timestamp: October 09, 2021, 01:20:14 am
content: I concur doctor.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 09, 2021, 01:31:58 am
content: Also the other thing is a fuse, 2410 (imperial) size "brick" type.Note that inductors have two important parameters, and a number of other less common ones. You're probably never going to know anything about high frequency properties (core losses, AC resistance..), so that's out, but the inductance and current rating are of primary importance. Inductance is probably 47uH as above, and current is probably as much as you can find for a part of that size -- inductors aren't wildly different, they tend to offer as much capacity as they can, in the size they have.The other things we can tell: it's a molded or composite type chip, and may be called "shielded". It's certainly not a ferrite drum/bobbin type, nor a multilayer chip.So what's brought things to this point? Inductors rarely fail by themselves, and more likely a nearby switching circuit has already failed, causing the inductor, fuse, and various other things up or downstream of it, to fail in turn. All these must be checked, and replaced if failed. Often that's more than half the electronics in the thing, and, well -- that's why electronics tend to be so disposable these days, there's really very little worth repairing in them sadly.Tim

author: timenutgoblin
author_rank: Regular Contributor
timestamp: October 09, 2021, 02:43:45 am
content: Looks like it's shielded. Here's a Bourns Inc. inductor more closely matching the appearance in the photo:https://passive-components.eu/bourns-adds-three-new-automotive-grade-series-to-its-high-current-shielded-power-inductor-line/

author: Benjam
author_rank: Regular Contributor
timestamp: October 09, 2021, 02:45:28 am
content: Quote from: T3sl4co1l on October 09, 2021, 01:31:58 amYou are right