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Article #836Re: Why don't they mark SMD caps?
From: Robert Baer
Date: Thu, 23 Jul 2009 07:33
Date: Thu, 23 Jul 2009 07:33
35 lines
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3036 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. :) > > Try (automated) marking of 0402 or smaller caps...
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