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Subject:	Re: Cracked capacitors question
From:	Brian Ellis <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Fri, 3 Nov 2000 10:58:42 +0200
Content-Type:	text/plain
Parts/Attachments:	text/plain (45 lines)

Arturo

Large ceramic capacitors can cleave if subjected to ultrasonic cleaning.

Brian

Arturo Urias wrote:
>
> Dear subscribers:
>
> I have seen in a few of our products some cracked capacitors. The cracks
> are very small and it is usually very difficult to see them, even under a
> high maginification microscope. When we reflow one side of the capacitor
> with the solder iron, the capacitor completely separates. In a few cases I
> have seen the cracks even before we touch it up with the solder iron, so I
> know that somehow it is happening before touchup. This problem has been
> experienced on boards that do not go through the wave. There are other
> components like resistors and even other capacitors that do not show the
> same problem, even on the same product. The capacitors are 805s.
>
> Any ideas as to what is causing this?
>
> Thanks!
>
> Arturo Urias
> National Instruments
>
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