At 02:31 PM 12/28/2010, you wrote:
>David VanHorn wrote:
> > I need about 10mJ energy storage, with a peak voltage of 16V, that can
> > withstand some fairly high temperatures.
> > ...
> > I need something that works like an electrolytic, tolerates much wider
> > temperature extremes, and costs roughly the same.
>
>It's going to cost what it costs, but ceramic capacitors can have much wid=
er
>operating temperatures.

Just to add to Olin's good suggestions, note that=20
there are ceramics, and there are ceramics.
Avoid X5/Y5 parts. For example, the Z5V parts are=20
rated to operate at -30 to 85=B0C, which
doesn't sound too bad, but the tolerance over=20
that range is +22/-82%. At BOTH ends of the
temperature range they practically disappear=20
electrically, with but 1/5 of the nominal
capacitance remaining. They also age. And they=20
have a voltage coefficient. Pretty much
everything seems to make the value lower.

X7R/X8R are good for wide temperature range and they don't change very much=
 in
value. X5R are a bit more narrow temp range but also reasonably stable.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the rewar=
d"
speff@interlog.com             Info for manufacturers: http://www.trexon.co=
m
Embedded software/hardware/analog  Info for designers:  http://www.speff.co=
m




--=20
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