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General Technical InformationTerms and definitionsTerm Symbol Unit Definition NotesRated voltageU RVMaximum operating peak voltage of anon reversing type waveform for whichthe capacitor has been designed forcontinuous operating. Figure 1.Figure 1.DC voltageU DCVThe mean value of the appliedDC-voltage. Figure 1.SuperimposedAC-voltageU ACVMaximum superimposed alternatingvoltage applied. Figure 1.U DC+U AC≤ U RRated reversedvoltageU REVThe maximum permitted reverse voltage(not in continous operation).U RE≤ 1.0VSurge voltageU SVA peak voltage induced by a switchingor any other disturbance of the systemwhich is allowed for a limited numberof times. Figure 1.1.15 x U Rfor U R≤ 315V1.10 x U Rfor U R> 315V1000 cycles with load period30s and no load period 330s,R x C = 0.1s.Transient voltageU TVSome of our capacitors can withstandpulses exceeding the surge voltage.(No general ratings, value on request)Rise time t R, 100 µs < t R< 5 msTime between transients > 5 min.Nominal voltage appliedbetween transients. 1000pulses randomly applied duringlife time.RatedcapacitanceC RFThe rated capacitance is the valuewhich is indicated upon the capacitor.Measured at ≤ 0.5V and 100 Hzwithout DC polarization, 20°C.DC capacitanceC DCFThe capacitance determined on basisof the capacitors storage capacitywhen charged with DC voltage.Measured acc. to DIN 41328.ImpedanceZWImpedance between capacitorterminals.Determines out put ripple voltage.Equivalent seriesresistanceR ESRWAn equivalent resistance in series withthe ideal capacitor representing all thelosses of the capacitor.Maximum R ESRis stated at100 kHz and 100 Hz, 20°C.Equivalent seriesinductanceL ESLHAn equivalent inductance in serieswith the ideal capacitor representingthe inductance of the winding and theterminals.Partly determines impedanceat high frequencies.Dissipation factortanδMeasure for the deviation from an idealcapacitor.Maximum tanδ available onrequest.KEMET Electrolytic Capacitors11