TDK Electronics · TDK Europe

April 1, 2014

Power capacitors: Extended range with higher energy density


TDK Corporation has extended its range of EPCOS MKK power capacitors. The new
MKK DCi-R series B25640* with resin impregnation is based on the proven MKK DC series with gas impregnation and MKK DC-I with oil impregnation. The new series features capacitors that are rated at up to more than 10 000 μF and designed for voltages of up to 4000 V DC. The energy density of the new resin impregnated capacitors is about 10 percent higher than that of the gas-impregnated types. Moreover, the flat winding technology allows a volume fill factor of about 95 percent to be achieved, so that highly compact components can be realized. Thanks to their rugged design, these capacitors are characterized by their high current capability and their ability to withstand high voltage and current peaks. In addition, the more highly developed internal structure of the new MKK DC-I series assures better heat dissipation from internal hot spots via the capacitor case.

The new improved MKK DCi-R capacitors satisfy even the most demanding requirements on reliability and enable an operating life of up to 40 years with failures in time (FIT) of less than 100. Depending on the type, the new design permits ESR values of down to 0.1 mΩ and ESL values down to 20 nH. The new capacitors are self-healing. Their main applications are in large traction converters and HVDC systems.

Main applications

  • Traction converters and HVDC systems

Main features and benefits

  • Energy density 10 percent higher than that of gas-impregnated types
  • Capacitance values of up to more than 10 000 µF
  • Voltages of up to 4000 V DC
  • Low ESR values and ESR values down to lower limits of 0.1 mΩ and 20 nH
  • Ability to withstand high voltage and current peaks
  • High current capability

For further information on the products contact Sales under

Please forward reader inquiries to marketing.communications(at)



About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's portfolio includes electronic components, modules and systems* marketed under the product brands TDK and EPCOS, power supplies, magnetic application products as well as energy devices, flash memory application devices, and others. TDK focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2013, TDK posted total sales of USD 9.1 billion and employed about 80,000 people worldwide.

* The product portfolio includes ceramic, aluminum electrolytic and film capacitors, ferrites, inductors, high-frequency components such as surface acoustic wave (SAW) filter products and modules, piezo and protection components, and sensors.

Media Contact

Christoph Jehle TDK Electronics AG Munich/Germany Phone +49 89 54020-2441 Get in contact
Debbie Martin TDK Electronics Inc. Fountain Hills, AZ/USA Phone +1 480 836-4104 Get in contact
Candido Dall'Agnoll TDK Electronics do Brasil Ltda. São Paulo/Brazil Phone +55 51 3484-7007 Get in contact
Himalaya Baghel TDK India Private Limited Mumbai/India Phone +91 12 04 50 58 42 Get in contact
Stella Suen TDK Electronics Hong Kong Limited Phone +852 3669-8224 Get in contact
Vincent Gaff Tronic's Microsystems SA Phone +33 4 76 97 29 60 Get in contact

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