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PICList Thread
'[EE] capacitor value'
2008\11\07@081019 by Luis.Moreira

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Hi Guys,
I have a capacitor with these markings on it (222M), what do you think
is value is? Is it 222pF x 10^6?
Best Regards
               Luis  

2008\11\07@083243 by Steve Howes

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On 7 Nov 2008, at 13:09, Luis Moreira wrote:
> Hi Guys,
> I have a capacitor with these markings on it (222M), what do you think
> is value is? Is it 222pF x 10^6?
> Best Regards
>                Luis


http://www.google.co.uk/search?q=capacitor+222m

Turns up:

http://www.alibaba.com/product-gs/202770267/Ceramic_Disc_Capacitor_20KV_222M_.html

222pf. Don't know if its right or not. Further googling will probably  
verify.

2008\11\07@083805 by Steve Smith

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If it conforms to the norm it should be 2N2... or 2 2 2x0's

Try and measure it most flukes can do capacitors...


Steve

-----Original Message-----
From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu] On Behalf Of
Luis Moreira
Sent: 07 November 2008 13:10
To: Microcontroller discussion list - Public.
Subject: [EE] capacitor value



Hi Guys,
I have a capacitor with these markings on it (222M), what do you think
is value is? Is it 222pF x 10^6?
Best Regards
               Luis  

2008\11\07@090437 by Michael Rigby-Jones

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> -----Original Message-----
> From: piclist-bouncesspamKILLspammit.edu [.....piclist-bouncesKILLspamspam.....mit.edu] On
Behalf
{Quote hidden}

22*10^2 = 2200 pF or 2.2nF.

The 'M' is a tolerance marker which signifies +- 20%.

Regards

Mike

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2008\11\07@091129 by olin piclist

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Luis Moreira wrote:
> I have a capacitor with these markings on it (222M), what do you think
> is value is?

2.2nF.

********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.

2008\11\07@094728 by Luis.Moreira

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Thank you all for your help.


-----Original Message-----
From: EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTmit.edu [piclist-bouncesspamspam_OUTmit.edu] On Behalf
Of Olin Lathrop
Sent: 07 November 2008 14:11
To: Microcontroller discussion list - Public.
Subject: Re: [EE] capacitor value

Luis Moreira wrote:
> I have a capacitor with these markings on it (222M), what do you think
> is value is?

2.2nF.

********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.

2008\11\07@124134 by Sean Breheny

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Along these lines, can anyone provide guidance to tell the difference
between caps which have the decimal value printed on them versus ones
which use the exponential notation?

For example, if a cap says "222" it is pretty clear that it is 22 x
10^2 pF, since there is very little likelihood that they would spec a
cap as 222pF.

However, I have seen caps with "220" written on them which are 220pF
and also ones which are 22pF. Is there some other marking on them
which helps to make the distinction or would one have to measure the
cap?

Thanks,

Sean


On Fri, Nov 7, 2008 at 9:02 AM, Michael Rigby-Jones
<@spam@Michael.Rigby-JonesKILLspamspambookham.com> wrote:
>
>
>> {Original Message removed}

2008\11\07@140155 by Andre Abelian

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Sean,

Last digit means how many 0's to add. 222 is 2200 pf and 220 there is no
0 to add means 22 pf. If it was 221 then would be 220 pf

Andre



{Original Message removed}

2008\11\07@161355 by Jinx

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> Last digit means how many 0's to add. 222 is 2200 pf and 220 there
> is no 0 to add means 22 pf. If it was 221 then would be 220 pf

That's been my experience. If the manufacturer means something else
then they generally indicate that by adding more information. For example
I have small ceramics, marked '330pF', '47p', '10n' and just '2.2'. Some
older, larger mica caps even have '100,000pF'. I suspect they would have
come from the days of paper and wax 'condensers' in valve circuits

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