Ceramic Capacitors Over Time

Ceramic capacitors do age while tantalums do not.

Ceramic capacitors over time. As well they have very high losses and age over time. Ceramic capacitor aging made simple christopher england applications engineer hvs products class ii dielectrics experience a phenomenon called aging and it is simply a decrease in capacitance over time due to crystalline changes that occur in all class ii dielectrics x7r x5r and y5v. In terms of capacitor performance tantalums and ceramic capacitors differ in a few key ways. Among ceramic capacitors the capacitance especially of capacitors classified as a high dielectric constant b x5r r x7r characteristics decreases over time.

The dielectric is characterized by very high nonlinear change of capacitance over the temperature range. When using these products for time constant circuits etc please take time to fully understand their characteristics and check the actual conditions of use and actual equipment. The terminations of ceramic capacitors will typically oxidize over time degrading solderability and affecting the wetting characteristics of the capacitor if not stored properly. Barrier layer ceramic capacitors are made of doped ferroelectric materials such as barium titanate batio 3.

Tantalum capacitors do not even have a known wear out mechanism. Ceramic capacitor aging class ii dielectrics experience a phenomenon called aging and it is simply a decrease in capacitance over time due to crystallinechanges that occur in all class i i dielectrics x7r x5r and y5v. Contact with sulfur dioxide or chlorine gas will accelerate an oxidation layer forming on the terminations.