Datasheet

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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Single-Ended Aluminum Electrolytic Capacitors – ESK, +85°C
Equivalent Series Inductance (ESL)
Equivalentseriesinductanceorselfinductanceresultsfromtheterminalcongurationandinternaldesignofthecapacitor.
Equivalent
Series
Capacitance
(ESC)
Equivalent
Series
Resistance
(ESR)
Equivalent
Series
Inductance
(ESL)
Capacitor Equivalent Internal Circuit
Equivalent Series Resistance (ESR)
Equivalent series resistance is the resistive component of the equivalent series circuit. ESR value depends on frequency and
temperature,andisrelatedtothetanδbythefollowingequation:
ESR=Equivalentseriesresistance(Ω)
ESR =
tanδ
tanδ=Dissipationfactor
2πfESC
ESC = Equivalent series capacitance (F)
f = Frequency (Hz)
Tolerance limits of the rated capacitance must be taken into account when calculating this value.
Impedance (Z)
Impedance of an electrolytic capacitor results from a circuit formed by the following individual equivalent series
components:
Equivalent
Capacitance
C
o
R
e
L
C
e
C
o
R
e
L
C
e
C
o
= Aluminum oxide capacitance (surface and thickness of the dielectric.)
R
e
= Resistance of electrolyte and paper mixture (other resistances not depending on the frequency are not considered: tabs,
plates, etc.)
C
e
= Electrolyte soaked paper capacitance.
L = Inductive reactance of the capacitor winding and terminals.
Impedance of an electrolytic capacitor is not a constant quantity that retains its value under all conditions; it changes
depending on frequency and temperature.
Impedance as a function of frequency (sinusoidal waveform) for a certain temperature can be represented as follows: