Kemet tackles arcing in high voltage chip capacitors
Kemet has introduced a patent-pending ArcShield multilayer ceramic capacitor (MLCC) technology in X7R dielectric for use in high voltage applications where surface arcing (arc-over discharge) is a concern.
As an alternative to surface coating, the technology is designed to inhibit surface arc-over discharge, thereby preventing damage to the capacitor and surrounding components on a printed circuit board.
According to the supplier, when application voltages meet or exceed 300 V some MLCCs are susceptible to surface arcing, which is generally caused by a high voltage gradient between the MLCC’s termination surfaces or between one termination surface and the component’s internal electrode structure.
“ArcShield High Voltage MLCC technology features a unique, robust internal shield electrode system that suppresses arc-over while increasing capacitance to the highest values available in the industry,” said Bill Sloka, Kemet specialty product manager.
“It offers downsizing opportunities for larger case size products with the same capacitance and voltage rating,” said Sloka.
The capacitors will typically be used as snubbers, in voltage multiplier circuits and in general lighting applications.
Typical markets include industrial, lighting, telecommunications, automotive, and alternative energy.