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Date: | Wed, 17 Apr 96 13:26:27 MDT |
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Lou Hart asked,
By less stable, do you mean their
capacitance value changes with temperature over a short time, or that
they dry out, over a relatively long time?
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By less stable I meant...From "High Speed Digital Design" by Johnson and
Graham...loosely quoted
Aluminum electrolytics commonly have an initial tolerance of +/-20%...
an aging factor...which amounts to +/-15% after 1,000 hours at their max rated
temp...temp derating factor, about -5% at 0-degrees C...can take away 40% of
the capacitance you thought you were buying...ESR ratio of 14:1 from 0 to
60-degrees C...At temps below 0-degrees C, the ESR on this particular
capacitor renders it useless for digital bypassing...
As always, the suitability of anything depends on its application and
how it compares to the available alternatives.
---
Gary D. Peterson
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