T521 High Voltage Polymer Electrolytic, 12.5 – 75 VDC

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The KEMET Organic Capacitor (KO-CAP®) is a solid electrolytic capacitor with a conductive polymer cathode capable of delivering very low ESR and improved capacitance retention at high frequencies. KO-CAP combines the low ESR of multilayer ceramic, the high capacitance of aluminum electrolytic and the volumetric efficiency of tantalum into a single surface mount package. Unlike liquid electrolyte-based capacitors, KO-CAP has a very long operational life and high ripple current capabilities.

The T521 High Voltage Polymer Electrolytic is designed for higher application voltages than the T520 KO-CAP. Developed for use on 12, 24, 28 and 48 volt DC voltage rails. The low ESR of the T521 provides high ripple current capability. KO-CAP's long-life reliability enables the T521 to be an ideal alternative to liquid-based electrolytic capacitors.


  • Low ESR
  • Volumetrically efficient
  • Stable temperature characteristics
  • High ripple current capability
  • High reliability
  • 100% surge current tested
  • Low profile design
  • Halogen-Free Epoxy/RoHS Compliant
  • Operating Temperature -55°C to 105°C/125°C (Refer to part number for maximum temperature rating)
  • Rated Capacitance Range 4.7 – 330 µF at 120 Hz/25°C
  • Rated Voltage Range 12.5 – 75V


  • Industrial Power Supplies (to 50V)
  • Medical Diagnostics
  • Telecommunications
  • Computer
  • Military Grade Power Supplies (to 50V)
  • Avionics Instrumentation (to 50V)