Munich, Germany EPCOS AG has developed a new type of ceramic capacitor, designated as a multi-layer serial ceramic capacitor (MLSC), to minimize the risk of short circuits if the capacitor is damaged, particularly for applications where the capacitor is permanently connected to a power source or voltage source such as in automotive electronic circuits.
Based on a more robust multi-layer ceramic capacitor (MLCC) technology design, the internal structure of the MLSC is based on two capacitors connected in series, which is a requirement of automotive manufacturers for a redundant connection. Even if one fails due to a short circuit, no short circuit occurs in the overall component. This new technology offers high reliability at the ppb level due to more stringent process control and end of line testing, and meets AEC-Q200 requirements.
Ceramic capacitors installed in automobiles are exposed to particularly high mechanical and thermal stress. As a result, flexural rupture of conventional capacitors may lead to contact between electrodes of different polarity, which could result in overheating and fires, causing the affected module to fail.
The company said the MLSC devices, connected in series, reduce these risks significantly. In addition, no extra safety measures are required so existing designs and layouts can be retained.
Available in a 0805 case size, the new B37941X capacitors (X7R) in the MLSC series are offered in a capacitance value of 1 to 100 nF at 100 volts, and in capacitance values of 33 nF to 100 nF at 50 volts. With voltage derating, the components may be operated at temperatures up to 150°C. The standard operating temperature range is -55°C to 125°C. The new capacitors are suitable for automotive applications as well as portable electronic equipment and industrial electronics applications.
In addition, the company said the new B34741X series can replace standard capacitors that serve the same function with fewer capacitors required. The new capacitors can replace up to five standard capacitors.
These lead-free devices are priced at $0.02 to $0.04 each, depending on value and quantity, in quantities of less than 100,000. Samples are available now. Production orders may be placed in mid-May.
EPCOS, 1-800-888-7729, www.epcos.com