Ceramic Capacitors Over Time

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.

Ceramic capacitors over time.

Among ceramic capacitors the capacitance especially of capacitors classified as a high dielectric constant b x5r r x7r characteristics decreases over time. As well they have very high losses and age over time. This is caused by the relaxation or realignment of the electrical dipoles within the capacitor. Contact with sulfur dioxide or chlorine gas will accelerate an oxidation layer forming on the terminations.

The terminations of ceramic capacitors will typically oxidize over time degrading solderability and affecting the wetting characteristics of the capacitor if not stored properly. 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. Ceramic capacitors do age while tantalums do not. Barrier layer ceramic capacitors are made of doped ferroelectric materials such as barium titanate batio 3.

The capacitance value additionally depends on the voltage applied. 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. When it comes to capacitors a logarithmic decrease in capacitance over time is referred to as aging.