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© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com

A4002_EEV • 2/21/2014

Surface Mount Aluminum Electrolytic Capacitors – EEV Series, +105ºC

Equivalent Series Resistance (ESR)

EquivalentSeriesResistanceistheresistivecomponentoftheequivalentseriescircuit.ESRvaluedependsonfrequencyand

temperatureandisrelatedtothetanδbythefollowingequation:

ESR=EquivalentSeriesResistance(Ω)

ESR =

tanδ

tanδ=DissipationFactor

2πfESC

ESC = Equivalent Series Capacitance (F)

f = Frequency (Hz)

Tolerancelimitsoftheratedcapacitancemustbetakenintoaccountwhencalculatingthisvalue.

Impedance (Z)

Impedanceofanelectrolyticcapacitorresultsfromacircuitformedbythefollowingindividualequivalentseriescomponents:

L

C

o

R

e

L

C

e

C

R

etc.)

C

L=Inductivereactanceofthecapacitorwindingandterminals

Impedanceofanelectrolyticcapacitorisnotaconstantquantitythatretainsitsvalueunderallconditions;itchangesdependingon

frequency and temperature.

Impedanceasafunctionoffrequency(sinusoidalwaveform)foracertaintemperaturecanberepresentedasfollows:

L

0.1

1

10

100

1000

10000

0.1

1

10

100

1000

Z [ohm]

F [KHz]

B

C

A

1/ω

ω

ω

ω Co

Re

1/ω

ω

ω

ω

Ce

ωL