Selected Category：Aluminum Electrolytic Capacitors
This document explains how to use the lifetime estimation for aluminum electrolytic capacitors.
There are two types of packaging material (reel) for SMD type products: cardboard (ninth digit of parts number is D) and plastic (ninth digit of parts number is R).
Plastic material is used in standard products.
AEC-Q200 is the reliability test standard for approval of passive components in Automotive applications. It specifies the test type, parameters and quantity, etc. for each component.
Failure modes depend on the application conditions that lead to fail.
Where a capacitor is once charged and discharged with both of the terminals short-circuiting and then left the terminals open for a while, a voltage across the capacitor spontaneously increases again.
Some characteristics of an aluminum electrolytic capacitor are temperature-dependent. The higher the temperature is, the more deteriorated the capacitor will be. An increase in temperature accelerates the increase in leakage current and tanδ and the decrease in capacitance.
Tips for Selecting Capacitors Appropriate for Individual Applications
Aluminum electrolytic capacitors are used mainly for the filtering application of power supplies. Select appropriate capacitors for the specific requirements of each application, referring to the following examples for typical applications
Aluminum electrolytic capacitors are sensitive to contamination of halogen ions (especially to chlorine and bromine ions) though the degree of the effect depends on the properties of the electrolyte and/or sealing materials used in the capacitors. For using a halide-containing ﬂux, solvent (cleaning agent, adhesive or coating materials) or fumigant, the halide may penetrate into the capacitor through the rubber seal materials and cause the following corrosion reactions to occur.
Capacitor waste is categorized as industrial waste.
When disposing of capacitors, local government regulations should be strictly observed.
The larger the surface area of an electrode is, the higher the capacitance (capacity for storing electricity) is. For aluminum electrolytic capacitors
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