Datasheet

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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Single-Ended Aluminum Electrolytic Capacitors – ESK, +85°C
Application and Operation Guidelines
Electrical Ratings:
Capacitance (ESC)
Simplifi ed 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.
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)
Dissipation Factor tan δ (DF)
DissipationFactortanδistheratiobetweentheactiveandreactivepowerforasinusoidalwaveformvoltage.Itcanbe
thought of as a measurement of the gap between an actual and ideal capacitor.
reactive
active
ideal
actual
δ
Tanδismeasuredwiththesameset-upusedfortheseriescapacitanceESC.
Tanδ=ωxESCxESRwhere:
ESC = Equivalent series capacitance
ESR = Equivalent series resistance