FAQ
Is there any temperature dependency in aluminum electrolytic capacitors?
The characteristics of a capacitor are not constant even within the specified temperature range. The figure on the below shows an example of the temperature variation of capacitance and impedance. Due to the characteristics of the electrolyte, the capacitance of an aluminum electrolytic capacitor increases and the impedance decreases at high temperatures. At lower temperatures, the capacitance decreases and the impedance increases. Since these characteristic values vary depending on the series and capacitance, it is necessary to confirm that there is no problem in the circuit operation by checking the operation on the actual device using the capacitor to be used.
Also, if the capacitor is used above the upper limit of the category temperature, the pressure inside the capacitor will increase due to the rise in vapor pressure of the electrolyte and the electrochemical reaction caused by the current flow, which can result in rupture or leakage.
