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Article #789Re: Why don't they mark SMD caps?
From: Archimedes' Lever
Date: Fri, 24 Jul 2009 01:24
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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X-Google-Thread: a5a6238865,26f718ada9b9cff2 X-Google-Attributes: gida5a6238865,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news2.google.com!npeer01.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!post02.iad.highwinds-media.com!newsfe12.iad.POSTED!7564ea0f!not-for-mail 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 Message-ID: <h43i651g10cbhpi23u20igtjfp0ns2glah@4ax.com> References: <Z_S9m.29971$ZN.18539@newsfe23.iad> <pan.2009.07.23.19.06.53.738790@example.net> <Fj5am.30260$3m2.12993@newsfe06.iad> X-Newsreader: Forte Agent 4.2/32.1118 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 17 NNTP-Posting-Host: 72.197.145.220 X-Complaints-To: newsmaster@cox.net X-Trace: newsfe12.iad 1248398670 72.197.145.220 (Fri, 24 Jul 2009 01:24:30 UTC) NNTP-Posting-Date: Fri, 24 Jul 2009 01:24:30 UTC Date: Thu, 23 Jul 2009 18:24:21 -0700