The following presentation is a technical tutorial given by Vishay Product Marketing engineer, Theo van de Steeg on handling heat issues when working with aluminum capacitors.
The lifetime of an aluminum electrolytic capacitor will be shortened as its temperature increases. For every 10 degrees C decrease in temperature at the hottest spot of the capacitor, its lifetime is essentially doubled, so the lifetime varies exponentially with heat.
Vishay's educational technical presentation which follows in this informative slideshow delves much more deeply into this issue; your system reliability can strongly depend on keeping the heat down in capacitors.
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