[Premium-Rx] Nonsmoking capicators

[DAVEINBHAM at aol.com]

Gary,
Back a couple decades ago when I was designing stuff for the early space 
shuttle flights, I just made it a policy to not use electrolytic capacitors. They 
can't fail if they aren't on board.

Jusat exactly what is " stacked mono-ceramics " ? I probably know 'em by 
another name, but I do not recognize the term.

Kindest regards,
Dave
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Guys,

I have a couple suggestions with regard to Tantalum capacitors.

1.  I use them in my spaceflight flight hardware...with serious derating.  On 
5 VDC lines I use 50 VDC capacitors with a 320 hour high temperature burn-in.

2.  On my power supply outputs I used to use "wet slug" Tantalums.  Again 
with serious derating the ESR is good and they seem to last forever.  In the last 
10 years I've gone to stacked mono-ceramics.  Inspite of the cracks in the 
lead frames they are pretty good.

On the other side, I once tested 50 VDC Tantalum capacitors for a 19 - 37 VDC 
application.  I could stroke them out with about a 25% failure rate.  And 
those were the hi-rel spaceflight parts.

Gary WA0SPM

Gary A. Geissinger
Chief Electrical Engineer
DigitalGlobe Inc.
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