Rugged aluminum electrolytic capacitors for automotive applications

June 04, 2013 // By Christoph Hammerschmidt
TDK has introduced 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. Applications 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.

Thanks to the low ESR values and a reduction in internal thermal resistance, the self-heating of the new B41689 series is significantly lower than with comparable products. 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. This does not only helps to reduce costs but also to increase reliability. The B41689 series of axial-lead capacitors achieves the same ripple current capability of single-ended capacitors with 60 percent less volume.

The 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.

All types are available in RoHS-compatible versions.

Further information on the products can be found under