EXV226M6R3A9BAA Datasheet, PDF (7/18 Pages) Kemet Corporation – Surface Mount Aluminum Electrolytic Capacitors

Surface Mount Aluminum Electrolytic Capacitors – EXV Series, +105°C
Application and Operation Guidelines
Electrical Ratings:
Capacitance (ESC)
Simplified equivalent circuit diagram of an electrolytic capacitor
The capacitive component of the equivalent series circuit (Equivalent Series Capacitance ESC) is determined by applying an
alternate voltage of ≤ 0.5 V at a frequency of 120 or 100 Hz and 20°C (IEC 384-1, 384-4).
Temperature Dependence of the Capacitance
Capacitance of an electrolytic capacitor depends upon
temperature: with decreasing temperature the viscosity
of the electrolyte increases, thereby reducing its
conductivity.
Capacitance will decrease if temperature decreases.
Furthermore, temperature drifts cause armature
dilatation and, therefore, capacitance changes (up to 20%
depending on the series considered, from 0 to 80°C). This
phenomenon is more evident for electrolytic capacitors
than for other types.
Capacitance Change vs. Temperature
(typical value)
Temperature (°C)
Frequency Dependence of the Capacitance
Effective capacitance value is derived from the impedance
curve, as long as impedance is still in the range where the
capacitance component is dominant.
C=
1 C = Capacitance (F)
2π fZ f = Frequency (Hz)
Z = Impedance (Ω)
Capacitance Change vs. Frequency
(typical value)
Frequency (kHz)
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A4003_EXV • 12/2/2016 7