Categorized | EPCOS, Industry News


Posted on 11 June 2019

Aluminum electrolytic capacitors: Rugged versions with higher ripple current capability



New axial-lead designs offer 50 percent higher ripple current capability than standard axial-lead capacitors


60 percent less volume than single-ended capacitor solutions



TDK Corporation presents a new series of rugged EPCOS axial-lead aluminum electrolytic capacitors for automotive electronics. These components are distinguished by their very high ripple current capability and vibration resistance. Thanks to the very low ESR values and a further reduction in internal thermal resistance, the self-heating of the new B41689* series is significantly lower. This allows the ripple current capability to be increased by 50 percent compared to standard axial-lead series. As a result, fewer parallel connected capacitors are required for extreme requirements, which not only helps to reduce costs but also to increase reliability. This series of axial-lead capacitors achieves the same ripple current capability of single-ended capacitors with 60 percent less volume.

These new capacitors are designed for a temperature range from -55 °C to +150 °C and offer an useful life of 10 000 hours at 125 °C. They have rated voltages of 25 V DC, 40 V DC and 63 V DC. Their capacitance range extends from 270 µF to 4500 µF.

Their optimized mechanical design allows a high vibration stability of up to 40 g to be attained. All types of the new series are available in various mechanical designs, such as soldering star or axial-lead capacitors with double-sided plates.

Applications of these rugged and reliable capacitors include engine management and fuel-injection systems, gearbox controllers, power steering systems as well as control units for fans, windshield wipers, or oil and water pumps. All types are available in RoHS-compatible versions.


  • ESR: The equivalent series resistance should be as low as possible to reduce losses.

Main applications

  • Engine management and fuel-injection systems, gearbox controllers, power steering systems, as well as control units for fans, windshield wipers, or oil and water pumps.

Main features and benefits

  • Very high ripple current capability
  • Low ESR values with significantly reduced self-heating
  • Significantly reduced volume
  • Particularly high vibration stability of up to 40 g
  • Wide temperature range from -55 °C to +150 °C
  • Long useful life of 10,000 h at 125 °C

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 which are 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.

About TDK-EPC Corporation

TDK-EPC Corporation, a TDK group company, is the manufacturer of TDK’s electronic components, modules and systems and is headquartered in Tokyo, Japan. TDK-EPC was founded on October 1, 2019 from the combination of the electronic components business of TDK and the EPCOS Group. 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.


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