Murata Technology Reduces MLCC Damage

Murata has developed a capacitor end-termination technology that significantly reduces the risk of damage when subject to bending stress. The GCJ and GRJ series of MLCCs incorporate Murata's 'soft' termination technology and are based on its GCM and GRM series of MLCCs for automotive (GCJ) and consumer-device (GRJ) applications. The GCJ series is AEC-Q200 compliant.

The 'soft' termination type reduces the risk of stress damage by applying a layer of conductive polymer within the capacitor's electrodes. It is the elasticity of the polymer that reduces the bending stress in the capacitor. In tests conducted by Murata, 'soft' termination MLCCs were soldered with 200um-thick solder to a typical 1.6mm-thick PCB and the board was then flexed. The soft-termination versions typically did not suffer any stress damage after the board had flexed 5mm.

The terminations of standard Murata MLCCs have three layers: the innermost copper, then nickel, then tin on the outside. In the GCJ and GRJ series, after the copper layer is added, conductive polymer is applied to the outer electrode and the nickel and tin layers are added as normal. The process does not affect the equivalent series resistance (ESR) or current rating, so the GRJ and GCJ series capacitors have the equivalent properties as their GRM and GCM counterparts. GRJ series are available with 250V-, 630V- and 1KV-rated voltage.

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