The newly launched water-repellent monolithic ceramic capacitor from Murata is designed to protect compact electronic devices that are prone to malfunctioning or failure due to the capacitor being moistened by condensation.
According to Murata, 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.
To address the following issue in electronic devices, Murata has developed a water-repellent monolithic ceramic capacitor that suppresses ion migration. Adding further, the release states that the monolithic 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 and this prevents ion migration.
This capacitor has applications particularly in navigation systems, body control electronic control units (ECUs), air- conditioner ECUs, meter ECUs and engine ECUs, etc.
Murata press release also mentions that sample shipments of the water repellent monolithic ceramic capacitor have already begun and the capacitor is scheduled to enter mass production within the year.