Failure mode of multilayer ceramic capacitor

Multi-layer ceramic capacitors have the advantages of small volume, high dielectric constant, good chemical stability and low loss, and are widely used in communications, automotive electronics, consumer digital and other fields. In recent years, the development of science and technology, defense industry and civil industry has put forward higher requirements for the reliability of multilayer ceramic capacitors. Therefore, its failure mode, mechanism and preventive measures are receiving more and more attention. Therefore, Xiaobian summed up the various failure modes of multilayer ceramic capacitors, hoping to help everyone.

The failure modes and failure mechanisms of multilayer ceramic capacitors are numerous. According to the performance of electrical parameters, the failure modes can be divided into three types, namely open circuit, short circuit and electrical parameter drift. Common is the electrical parameter drift, which includes the change of capacitance, the change of loss and the change of insulation resistance. Among the three parameters, the sensitive electrical parameters are loss value and insulation resistance value, as long as the failure is manifested, The loss value or the insulation resistance value have more or less different degrees of drift. Therefore, it is important to evaluate the loss value and the insulation resistance value for judging the failure state of the multilayer ceramic capacitor.

The failure mode of the short circuit is more common. It usually shows that the resistance between the two terminal electrodes drops significantly to the order of ohms or milliohms. This failure mode is mostly related to overvoltage. The failure mode of the open circuit is relatively rare. There are two main cases. One case is that after a severe over-current, the internal electrode or the end electrode and the internal electrode are burned to form an open circuit; another case is a kind of stress-induced end. Cracks and cracks occur between the electrodes and the internal electrodes due to overstress, resulting in poor electrical connection between the electrodes to form an open circuit. This failure is mostly related to the quality of the capacitor itself.

The above is the failure mode analysis of multilayer ceramic capacitors, I hope to help you.