Re: Surface mount cap

From: Peter Bennett (peterbb_at_somewhere.invalid)
Date: 08/14/04 

Date: Sat, 14 Aug 2004 10:07:49 -0700

On Sat, 14 Aug 2004 09:15:24 GMT, "Mjolinor" <mjolinor@hotmail.com>
wrote:

>
>"Peter Bennett" <peterbb@somewhere.invalid> wrote in message
>news:37rqh0lbencl3grfn5cu9opfq40fg3nfcr@news.supernews.com...
>> On Fri, 13 Aug 2004 21:50:26 GMT, "Mjolinor" <mjolinor@hotmail.com>
>> wrote:
>>
>> >I have a need to replace a capacitor, value 22,000pfd 1206 package 200v
>10%
>> >
>> >I have a book of TDK samples but no data sheets and can't find the info
>on
>> >the TDK site, physical size isn't a problem but I would think 200 volts
>is.
>> >I don't have much experience of the working voltage of these surface
>mount
>> >devices but 200 volt seems high to me for the size so, question, does the
>> >1206 just refer to physical dimensions or does that specify the voltage
>as
>> >well. I have 2012 in the right value but it is much smaller and I have
>1608
>> >which is a microscope job to even see it, will either of these do?
>> >
>>
>> Those numbers just refer to the size of the capacitor, in 0.01s of an
>> inch. A 1206 part is .120 x .060 inches. 2012 would be .2 x .12 -
>> huge as SMD capacitors go. 1608 is .16 x .08.
>
>I'll try that again and hope that crap I just wrote got deleted before it
>got anywhere :)
>
>Can't seem to make that fit. The 2012 caps are 75 thou by 50 thou by 25 thou
>which is much smaller than the 1206 that I need to replace. A full part
>number is C2012X7R1H223K, that is a 22,000 pF TDK cap, it makes no sense to
>me.
>

That looks like a metric size code, giving the size in units of 0.1
mm. 2012 metric is the same as 0805 imperial, so it is smaller than
1206. 1608 metric is 0603 imperial.

A quick look in a Newark catalog shows most SMD capacitors are 50 or
100 volts, but Johanson makes some 500 volt caps in 1206 and larger
sizes. 

-- 
Peter Bennett, VE7CEI  
peterbb4 (at) interchange.ubc.ca  
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