Accelerated Life Testing and Reliability of High K Multilayer Ceramic Capacitors

The reliability of high K muitilayer ceramic capacitors was evaluated using accelerated life testing. The degradation in insulation resistance was characterized as a function of voltage (two to eight times rated) and temperature (85 to 170°C). The times to failure at a voltage-temperature stress conformed to a iognormai distribution with a standard deviation typically less than 0.5. A small infant mortality population was also observed for some samples. The results were least-squares fit to the following equation: