Q.
Flex Crack Countermeasures (4): What happens to the MLCC (Multilayer Ceramic Chip Capacitor) once it is cracked?
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Figure 1: A diagram showing a typical 45° crack. The red electrodes are where the crack has passed through the active stack. This represents a risk for a short circuit.
A. Once a crack forms, this can allow moisture and contaminants to penetrate inside the component. If the crack crosses the active stack (the overlapping area of the electrodes) this can lead to a low electrical resistance path or “leaky short” developing over time. Once this low resistance path forms, this can cause further breakdown of the dielectric due to overheating. This overheating can lead to a true short circuit developing (Figure 1).
Figure 1: A diagram showing a typical 45° crack. The red electrodes are where the crack has passed through the active stack. This represents a risk for a short circuit.
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