Ceramic Capacitors Over Time

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 over time.

When it comes to capacitors a logarithmic decrease in capacitance over time is referred to as aging. 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. The dielectric is characterized by very high nonlinear change of capacitance over the temperature range. As well they have very high losses and age over time.

The capacitance value additionally depends on the voltage applied. Ceramic capacitors do age while tantalums do not. Tantalum capacitors do not even have a known wear out mechanism. 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. This is caused by the relaxation or realignment of the electrical dipoles within the capacitor. In terms of capacitor performance tantalums and ceramic capacitors differ in a few key ways.