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Murata unveils water-repellent monolithic ceramic capacitor

Posted: 31 Jul 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Murata? capacitor? water-repellent? ECU?

Murata has developed a water-repellent monolithic ceramic capacitor that flaunts an innovative surface treatment. According to the company, the capacitor has applications in navigation systems, body control electronic control units (ECUs), air conditioner ECUs, metre ECUs and engine ECUs, etc.

Electronic devices are becoming ever more compact and densely packed with components, with this comes an increase in the possibility of malfunctions influencing circuit operation due to ion migration.

Water-repellent monolithic ceramic capacitor

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 ionised 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 has developed a water repellent monolithic ceramic capacitor. The monolithic capacitor is treated with a water-repellent 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 and this prevents ion migration.

Sample shipments have begun and the capacitor is scheduled to enter mass production within the year.

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