Passive Components


New ceramic capacitors have reduced short-circuit risk

18 May 2005 Passive Components

Epcos has developed a new type of ceramic capacitor to minimise the risk of short circuits if the capacitor is damaged. The new product is suitable for applications in which the capacitor is permanently connected to a positive pole without extra safety measures.

Ceramic capacitors installed in automobiles are exposed to particularly high mechanical and thermal stress. Flexural rupture of conventional capacitors may lead to contact between opposite polarity electrodes with the resulting dangers of local overheating or a fire. The affected module then fails and the battery is discharged at the same time.

Connected in series, the MLSC (multilayer serial ceramic capacitor) reduces these risks significantly, says Epcos. Also, no extra safety measures are required, so that existing designs and layouts can be retained. The internal structure of the new component is based on two series-connected capacitors. Even if one of these should fail due to a short circuit, no short circuit occurs in the overall component.

The new series B37941X capacitors are available in size 0805 and ceramic material X7R. Types designed for a rated voltage of 100 V cover the capacitance range from 1 to 100 nF, while those for 50 V deliver 33 to 100 nF. With voltage derating, the components may be operated at temperatures up to 150°C and conform to AECQ200. These capacitors are suitable for all portable electronic equipment and industrial electronics as well as for automotive applications.



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