MURATA MANUFACTURING CO., LTD.: Water-Repellant Monolithic Ceramic Capacitor
Murata recently announced a new water-repellent monolithic ceramic capacitor that was reportedly developed by applying an innovative surface treatment. Electronic devices are becoming increasingly compact and densely packed with components, which leads to the rising possibility of malfunctions influencing circuit operation due to ion migration.
Ion migration may occur when voltage is applied to a capacitor where moisture is present between the electrodes. This may result in the anode metal becoming ionized and changing to a cathode. Then, when gaining electrons as a cathode, the metal may undergo the electrochemical phenomenon of deposition and growth that can eventually result in a short-circuit. This is particularly prone to occur when the capacitor is moistened by condensation.
To address this issue, Murata’s new monolithic ceramic capacitor is treated with a water-repellant treatment film so that moisture forms into scattered (rather than larger) droplets. These droplets are suppressed to a size that is not big enough to span the gap between the external electrodes, thus preventing ion migration.
For more information, visit www.murata.com.