Equivalent Series Resistance (ESR)
Equivalent series resistance (ESR) is a non-ideal property of a capacitor. It represents the resistance of the capacitor’s terminals and electrodes. The ESR of a capacitor changes with applied frequency. The different capacitors types all have different ESR properties and care must be taken to ensure that the selected capacitor has an ESR response compatible with the application in which is is being used.
The ESR can also be thought of as the real part of the capacitor’s impedance. The is the ESR that gives rise to the heating of the component when ripple current is applied.
See also Impedance (Z).
Thursday, July 23rd, 2015