Information

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2 Capacitor Characteristics
2.1 Capacitance of a capacitor
Fig. 2.2: Frequency-dependent capacitance change, example: MKP film capacitor
2.1.3 Dependence on time
Changes in capacitance can occur over time or use in the application. Possible effects:
a) time-limited capacitance change due to temperature change
If the capacitor is subjected to large temperature changes, which are still within
the permissible and specified temperature limits, it may occur that the capacitor
does not show the intended capacitance value for a certain time The dependence
of capacitance on temperature is presented in detail in Chapter 2.10 Temperature
coefficient/temperature dependence.
b) Capacitance change due to aging
Aging of a capacitor is caused by its type and the materials it contains. The respec-
tive aging behavior has to be taken by the user from the capacitor datasheet or
ascertained from the manufacturer.
–1.10
–0.90
–0.70
–0.50
0.50
–0.30
–0.10
0.10
0.30
1.010.0 100.0
Frequency f (kHz)
Capacitance change ∆C/C
0
(%)