T523 Polymer Capacitors KEMET T523 Polymer Capacitors (KO-CAP) offer solutions for applications requiring power loss protection (hold-up) or maximum power efficiency of a circuit. The capacitors feature high energy density, stable capacitance with applied voltage and temperature, and no aging effects. The conductive polymer cathode provides a low ESR and higher capacitance retention at high frequencies. Typical applications for KEMET T523 Polymer Capacitors include enterprise storage, networking, servers, mobile, client storage, and client computing.