Hi!
Almost all capacitor failures of this kind I analysed were due to cracks.
Some of the capacitors even broke during desordering after electrical failure.
A cross section will help you .If your failed capacitors are all in a specific location, and
you have similar capacitors OK in other locations, you have probably cracks due to mechanical
stress.
Good luck,
Gaby

Ken Patel wrote:

> They are SMT, 1206 size.
>
> re,
> kp
>
> -----Original Message-----
> From: Rick Howieson [mailto:[log in to unmask]]
> Sent: Tuesday, December 12, 2000 11:15 AM
> To: 'TechNet E-Mail Forum.'; 'Ken Patel'
> Subject: RE: [TN] Failure analysis of cap: Type analysis and any lab
> that can do th e job in San Jose Bay Area
>
> Ken,
> Are they through hole or SMT?
> Rick
>
> -----Original Message-----
> From: Ken Patel [mailto:[log in to unmask]]
> Sent: Tuesday, December 12, 2000 12:06 PM
> To: [log in to unmask]
> Subject: [TN] Failure analysis of cap: Type analysis and any lab that
> can do th e job in San Jose Bay Area
>
> Guys,
> I have caps with current leakage problem. I have few questions in that
> regards. What kind of test should I perform for failure analysis? What can
> be the possible causes for the failures? Any lab you guys can recommend in
> the San Jose Bay area.
>
> re,
> ken patel
>
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