FAQ
Is there any frequency dependence in aluminum electrolytic capacitors?
Each characteristic of an aluminum electrolytic capacitor has a frequency dependency.
The figure on the below shows a graph of typical frequency characteristics of impedance and ESR. Impedance decreases up to the resonance point and increases above the resonance frequency. This change is due to the nature of the aluminum oxide film as the dielectric, the characteristics of the electrolyte, and the structure of the capacitor. Since this characteristic value varies depending on the series and capacitance, it is necessary to confirm that there is no problem in the circuit operation by checking the operation with the actual capacitor to be used.
