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The main difference between aluminum electrolytic capacitors and conductive polymer capacitors is the electrolyte material. Aluminum electrolytic capacitors use a liquid electrolyte; conductive polymer capacitors use a solid conductive polymer electrolyte. The polymer composition material has extremely high conductivity which results in ripple current capability up to six times higher than aluminum capacitors, and ESR 75% lower than aluminum capacitors of the same case size. Generally, the life of aluminum electrolytic capacitors is estimated to quadruple for each 20°C decrease in operating temperature. In comparison, conductive polymer capacitors offer a longer life; for each 20°C decrease in operating temperature, the life of the polymer is estimated to be ten times longer. Conductive polymer electrolyte capacitors are also more stable at higher temperatures than aluminum capacitors.

PTM Published on: 2015-05-12