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Aluminum electrolytic capacitors: Rugged versions with higher ripple current capability

4th June 2013

ES Admin

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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