Polymer Tantalum Capacitors with Suppressed Transient Current
Written By: Jan Petržílek | Miloslav Uher | Jiří Navrátil
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Tantalum electrolytic capacitors are renowned for their high capacitance and volumetric efficiency, parametric stability over a long service lifetime, and long-term reliability under harsh operating conditions. The anode is constructed of a porous pellet of sintered tantalum powder with a dielectric of tantalum pentoxide formed by electrochemical anodization. The traditional cathode materials have been either a liquid electrolyte (wet hermetic types) or manganese dioxide (solid MnO2 surface mount types). However, the most recent material, fast becoming a popular option, is conductive polymer. The Polymer Tantalum capacitor was originally marketed toward consumer electronic applications, however after years of effort and continuous improvement, significant technological breakthroughs now permit use in many high-rel. Applications, including automotive, defense, and aerospace, where more traditional capacitors (MnO2 type) still dominate.