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1、ConductivePolymerCathodeTantalumCapacitorsPrepareby:Andychenandychen@kemet.comKEMETHistory#2Globalmanufacturing#3TantalumProcessPowderPressSinterFormation+CounterelectrodeImpregnationC+ConductivePolymerAgOvenAssemblyEncapsulationTesting#4ConductivePolymerCathodeTantalumcapacitorconstruc
2、tionWireResincaseAnodeLeadframeAnodeCathodePolymerDielectricCathodeDielectricformationTa2O5AnodeTantalum#5TantalumcapacitorconstructionWireResincaseAnodeAnodeLeadframeDielectricMnO2formationMnO2CathodeDielectricformationTa2O5AnodeTa#6SolidTantalumSurface-MountCapacitorPolymer/MnO2/Ta2O5
3、/TaSilverAdhesiveSilverPaintWasherLeadframe(-Cathode)Leadframe(+Anode)CarbonTantalumWireWeld#7ESRESRspreadofdifferentcapacitortechnologyESRvaluerange()100Aluminumcancapacitors10-1Tantalumcapacitors(MnO)210-2Polymercapacitors(PEDT)#8MnOvs.Polymer2T495D150uF(MnO2)vsT520D150uF(Polymer)Imp
4、edance&ESR(Ohms)100101MnO20.1Polymer0.011001,00010,000100,0001,000,00010,000,000Frequency(Hz)#9150μF/6WVDCESRversusFrequency101T491V157M006CommercialMnO20.1T495V157M006ESR(Ohms)“LowESR”MnO2T520V157M006Polymer0.011001,00010,000100,0001,000,00010,000,000Frequency(Hz)#10CapacitanceRoll-Off
5、T495D150μF(MnO)vs.T520D150μF(Polymer)2Capacitance(μF)150100PolymerMnO2500101,000100,00010,000,00010010,0001,000,000100,000,000Frequency(Hz)#11ElectricalConditioning(Aging)HealingEffectofMnOLayer2CrackMnO2NickelMn2O3Ta2O5Ta#12"Ignition"1.4.CrackTa+O2initiatesRAPIDLYcurrent&combine=heatIg
6、nitionO3.2.2MnOconversionOxygen2starts-Ofeedsheated2generated-TaOtoTa25crystallineTaTa2O5MnO2#13PolymerSelf-HealingMechanismEvaporationofConductivePolymerLayerCrack(vaporized)PolymerNickelvacatedOxidationofPolymerLayerTaTaO25PolymerPolymerCrackoxidizedNickelTaPolymerTa2O5#14MnOvs.Polyme
7、r-Ignitions2MnOMnOMnOMnOMnO22222PolyPolyPolyPolyPolyTestcardwithcapacitorssubjectedto2xRatedVoltage,appliedwithreversepolarityand>20amperescurrentcapability.#15MedianValuesTa-PolyTa-PolyKOKOMnO2VR>10VR<=10100PPMFR68%126%197%%VRated@50%VRated900FR(PPM)@80%VRated45841FR(PPM)@90%V
