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Article #773

Re: Why don't they mark SMD caps?

#773
From: Bob Larter
Date: Sat, 25 Jul 2009 14:43
40 lines
2692 bytes
Dennis wrote:
> "David L. Jones" <altzone@gmail.com> wrote in message 
> news:Z_S9m.29971$ZN.18539@newsfe23.iad...
>> An interesting question was posted on another forum:
>> "can you get (ceramic) SMD caps (1206,0805 etc) with the values printed on 
>> them?".
>>
>> My first response was that I've very rarely seen this (like maybe once), 
>> and while it is possible (see 
>> http://www.synrad.com/search_apps/application_briefs/117-2.htm), you 
>> basically can't get labeled ones, they are almost always without markings.
>>
>> It got me to thinking, why is it so?
>> My guess would be that it's due to the surface finish (or lack thereof) on 
>> ceramic capacitors, and/or the delicate nature of their multi-layer 
>> construction means they could be more easily damaged or properties altered 
>> by the process.
>> As opposed to most SMD resistors that have a coating on them which would 
>> allow for easy and accurate printing using various technologies.
>>
>> Any know the real reason(s) why ceramic SMD caps don't have markings?
>>
>> Dave.
>> -- 
>> ================================================
>> Check out my Electronics Engineering Video Blog & Podcast:
>> http://www.alternatezone.com/eevblog/
>>
>>
> 
> It done purely to give techs the shits when building proto's or fault 
> finding.      :) 

LOL. Ain't that the truth.

-- 
    W
  . | ,. w ,   "Some people are alive only because
   \|/  \|/     it is illegal to kill them."    Perna condita delenda est
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From: Bob Larter <bobbylarter@gmail.com>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Why don't they mark SMD caps?
Date: Sun, 26 Jul 2009 00:43:09 +1000
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