The KEMET Organic Capacitor is a capacitor with a Ta anode and Ta2O5 dielectric. A conductive organic polymer replaces the traditionally used MnO² as the cathode plate of the capacitor. This results in very low ESR and improved capacitance retention at high frequency. The polymer technology also exhibits a benign failure mode which eliminates the ignition failures that can occur in standard MnO² tantalum types. Polymer tantalum capacitors may be operated at voltages up to 90% of rated voltage for part types with rated voltages of ≤ 10 volts with equivalent or better reliability than traditional MnO² tantalum capacitors operated at 50% of rated voltage. The T591 Series High Performance Automotive Grade Polymer was developed to deliver higher stability under harsh conditions of humidity and temperature. Special enhancements in design and material setting was introduced in the build of the material to deliver 500 hours under 85°C / 85% RH/Ur. This T591 Series is manufactured in a ISO TS 16949 certified plant and is subject to PPAP/PSW and change control.