June 2013

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.

Glossary

  • 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

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