Datasheet

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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Surface Mount Aluminum Electrolytic Capacitors – EDH, +105°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: