Its depend if the failure is inside the capacitor or a solder joint
failure.
Crack / short / open (inside the caps layers) in such small size of SMT
caps (for pacemakers), supposed to be a manufacturing failure.
Solder joint failure - Solder crack, thumb stone, de wetting, shift, etc is
a PCB design or process failure.
Subject
27/06/2006 18:09 Re: [TN] Bad capacitors in Boston
Scientific Defibrillators and
Pacemakers
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M
Hi,
Everybody seems to be concentrating on the capacitors—it could just as
likely
be the assembly process in combination with the PWB design cracking the
CCs.
In fact, from the reported numbers/percentages, that would be my first
guess.
Werner
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