Re: Why don't they mark SMD caps?

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#835

From: Robert Baer
Date: Thu, 23 Jul 2009 07:31

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David L. Jones wrote:
> 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.
   Ahh..the caps could likewise be coated (and AFAIK they .are. coated 
prior to potting for leaded versions).
   Then, given that coating, they could be marked like the resistors you 
mentioned.
   BUT..that was "never" done so it will not be done (gotta stay in that 
rut...).

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Subject: Re: Why don't they mark SMD caps?
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