KO-CAP Low ESR Polymer (T520 Series)

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The KEMET Organic Capacitor (KO-CAP) is a polymer 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 KOCAP also exhibits a benign failure mode which eliminates the ignition failures that can occur in standard MnO2 tantalum types. KO-CAPs may also be operated at steady state voltages up to 90% of rated voltage for part types with rated voltages of ≤ 10 volts and up to 80% of rated voltage for part types > 10 volts with equivalent or better reliability than traditional MnO2 tantalum capacitors operated at 50% of rated voltage.

The T520 Series KO-CAP Low ESR Polymer captures the best features of multilayer ceramic (low ESR, high frequency capacitance retention), aluminum electrolytic (higher capacitance, benign failure mode), and proven solid tantalum technology (volumetric efficiency, surface mount capability, extremely long life). The T520 can reduce component counts, eliminate through-hole assembly by replacing cumbersome leaded aluminum capacitors, and offer a cost-effective and space-saving solution.


• Extremely low ESR
• -55°C to 105°C operating temperature range
• Polymer cathode technology
• High frequency capacitance retention
• Non-ignition failure mode
• Capacitance up to 1,500 μF
• 100% accelerated steady state aging
• 100% surge current tested
• Taped and reeled per EIA 481–1
• Volumetric efficiency
• Self-healing mechanism
• EIA standard case sizes


• DC/DC converters
• Notebook PCs
• Portable electronics
• Telecommunications (mobile phone and base station)
• Displays
• SSD, HDD and USB


Datasheet (PDF)