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Image of KEMET's Aluminum Electrolytic Capacitors Slide 11

These are the potential failure modes of an aluminum electrolytic capacitor. Looking at the ESR increase as an example, earlier it was established that lower the ESR the better it is. A possible reason for an increased ESR could be a reduction in electrolyte or anode cathode foil capacitance drop. These are caused due to operating conditions or excessive thermal stress to name a few.

PTM Published on: 2019-02-28