Capacitor Specifications
Dielectric Absorption

Capacitor Specifications

The dielectric absorption of a capacitor is the inability of a capacitor to completely discharge to zero.

It is sometimes referred to battery action or capacitor memory, because of this charge retention, and this is due to the dielectric of the capacitor retaining a charge after it is supposedly discharged.

The effect of dielectric absorption is that it reduces the capacitance value of the capacitor.

High dielectric absorption is a negative, undesired trait of a capacitor, while low dielectric absorption is a positive, desired one.

All capacitors have some dielectric absorption, but electrolytic capacitors have the highest amount. Dielectric absorption has an undesirable effect on circuit operation if it becomes excessive.

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