The influence of termination properties on the thermal shock andthermal cycle performance of surface mount multilayer ceramic capacitors

摘要

The thermal shock and thermal cycle performance of X7R and NPOsurface mount multilayer ceramic capacitors terminated with variousmaterials is studied. The type of glass frit used in the termination,the quantity of frit in the termination, and the temperature at whichthe termination is fired are all found to be important factors. Theinfluence of these factors appears to be related to the reaction betweenthe glass frit and the ceramic dielectric. In general, increasing theamount of frit in the termination improved thermal shock performance,although some frits clearly outperformed others. Thermal cycleperformance was found to be more strongly influenced by fritcomposition, but frit concentration was also important. Terminationfiring temperature was not studied extensively, but appeared to have aslight effect on thermal shock performance