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Selected Category：Aluminum Electrolytic Capacitors > Electrical characteristics
The measurement method and frequency of radial lead-type capacitors is standardized in accordance with JEITA RC-2003, and the value at a frequency of 40MHz is set as the ESL.
Dissipation factor (DF) is regulated as an electrical property of aluminum electrolytic capacitors.DF is one of the metrics used to express capacitor loss.
In an ideal capacitor, there is no resistance element and loss does not exist, so DF is zero.
Aluminum electrolytic capacitors do not experience changes in capacitance due to voltage bias.
This is because the aluminum oxide used as a dielectric does not have piezoelectric properties.
Aluminum electrolytic capacitors use electrode foils with two different types of withstand voltage.
As a result, the capacitors have polarity and there is the potential for rupturing if voltage in the reverse direction is applied.
The aluminum electrolytic capacitor case is connected with a cathode terminal and an unstable resistance component, which can result in equivalent potential that is unstable.
A potential difference may occur due to the presence of an oxide film with high withstand voltage properties between the case and the anode terminal.
Capacitance
The larger the surface area of an electrode is, the higher the capacitance (capacity for storing electricity) is. For aluminum electrolytic capacitors
When a capacitor is applied with a voltage with the frequency changed, the impedance (Z), a factor of preventing the AC current changes as shown in (Fig. 14). This is the impedance-frequency characteristics of the capacitor.
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