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Article #789

Re: Why don't they mark SMD caps?

#789
From: Archimedes' Lever
Date: Fri, 24 Jul 2009 01:24
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On Fri, 24 Jul 2009 08:17:16 +1000, "David L. Jones" <altzone@gmail.com>
wrote:

>Then why do they mark the exact same size resistors?
>Resistors are generally cheaper than caps, so it would make more sense not 
>to mark the resistors to increase the margin, so it would be the other way 
>around, if that's the real reason.
>
>Dave.
>
>-- 
  SMD resistors get a ceramic glaze coating over the applied resistance
medium.  It gets fired on.  The lettering is usually fired glaze as well.
The resistance medium is hygroscopic, so they have to seal it up.

  multilayer chip caps CANNOT be fired in an oven that way.  They barely
make it through the reflow process.
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From: Archimedes' Lever <OneBigLever@InfiniteSeries.Org>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Why don't they mark SMD caps?
Organization: Archimedes'Palimpsest
Reply-To: My Assistant:  Zhang Heng
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Date: Thu, 23 Jul 2009 18:24:21 -0700