10uF(M) Capacitor - UK Vintage Radio Repair and Restoration Discussion Forum

cathoderay57 · 30th Apr 2021, 2:00 pm

Hello all, I have a small RS Components aluminium can electrolytic marked 450v 10uF(M). Anybody know what the M in brackets signifies? Professor Google has been unable to reveal any useful answers. Cheers, Jerry

tony brady · 30th Apr 2021, 2:05 pm

M means 20% tolerance

cheers
Tony

cathoderay57 · 30th Apr 2021, 2:20 pm

Hi Tony, that's great, thanks very much. I've been in this game for years and never encountered that coding system. If I'd had the RS part number I'd have looked up the datasheet but as it is used and otherwise unmarked I couldn't. Cheers, Jerry

tony brady · 30th Apr 2021, 2:24 pm

Hi Jerry

there is a range of letters in use. common ones are J for 5% and K for 10% which you may have seen but not realised what they meant

cheers
Tony

DMcMahon · 30th Apr 2021, 5:42 pm

This link covers capacitor codes including the capacitance % tolerances, in my experience it is not very common to see these % tolerance codes on electrolytic
capacitors.

https://www.electronics-notes.com/ar...s-markings.php

David

cathoderay57 · 1st May 2021, 9:33 am

Thanks all! Jerry

Maarten · 1st May 2021, 4:58 pm

The letter M is very common on electrolytics. For some reason I've never thought about the meaning, just assumed that it was a common convention to indicate a standard series Miniature electrolytic. Tolerance makes more sense, though.

30th Apr 2021, 2:00 pm	#1
cathoderay57 Nonode Join Date: Oct 2017 Location: Bristol, UK. Posts: 2,389	10uF(M) Capacitor Hello all, I have a small RS Components aluminium can electrolytic marked 450v 10uF(M). Anybody know what the M in brackets signifies? Professor Google has been unable to reveal any useful answers. Cheers, Jerry Attached Thumbnails

30th Apr 2021, 2:05 pm	#2
tony brady Hexode Join Date: Mar 2014 Location: Peacehaven, East Sussex, UK. Posts: 278	Re: 10uF(M) Capacitor M means 20% tolerance cheers Tony

30th Apr 2021, 2:20 pm	#3
cathoderay57 Nonode Join Date: Oct 2017 Location: Bristol, UK. Posts: 2,389	Re: 10uF(M) Capacitor Hi Tony, that's great, thanks very much. I've been in this game for years and never encountered that coding system. If I'd had the RS part number I'd have looked up the datasheet but as it is used and otherwise unmarked I couldn't. Cheers, Jerry

30th Apr 2021, 2:24 pm	#4
tony brady Hexode Join Date: Mar 2014 Location: Peacehaven, East Sussex, UK. Posts: 278	Re: 10uF(M) Capacitor Hi Jerry there is a range of letters in use. common ones are J for 5% and K for 10% which you may have seen but not realised what they meant cheers Tony

30th Apr 2021, 5:42 pm	#5
DMcMahon Dekatron Join Date: Apr 2019 Location: Worthing, West Sussex, UK. Posts: 6,604	Re: 10uF(M) Capacitor This link covers capacitor codes including the capacitance % tolerances, in my experience it is not very common to see these % tolerance codes on electrolytic capacitors. https://www.electronics-notes.com/ar...s-markings.php David Last edited by DMcMahon; 30th Apr 2021 at 5:48 pm.

1st May 2021, 9:33 am	#6
cathoderay57 Nonode Join Date: Oct 2017 Location: Bristol, UK. Posts: 2,389	Re: 10uF(M) Capacitor Thanks all! Jerry

1st May 2021, 4:58 pm	#7
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,203	Re: 10uF(M) Capacitor The letter M is very common on electrolytics. For some reason I've never thought about the meaning, just assumed that it was a common convention to indicate a standard series Miniature electrolytic. Tolerance makes more sense, though.