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Article #834

Re: Why don't they mark SMD caps?

#834
From: Dennis
Date: Thu, 23 Jul 2009 06:27
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"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.      :) 
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From: "Dennis" <dennis@nowhere.com>
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Subject: Re: Why don't they mark SMD caps?
Date: Thu, 23 Jul 2009 14:27:01 +0800
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