Microsoft Word - thermele.doc HEGEROVAM

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ThermalandElectrical BreakdownVersus ReliabilityofTa2O5under Both–BipolarBiasing Conditions P.Vašina,T.Zední&

Specifications	Microsoft Word - thermele.doc HEGEROVAM
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Content	ThermalandElectrical BreakdownVersus ReliabilityofTa2O5under Both–BipolarBiasing Conditions P.Vašina,T.Zedníček,Z.Sita AVXCzechRepublics.r.o.,Dvorakova328,56301Lanskroun,CzechRepublic Phone:+420467558126,Fax:+420467558128 J.Šikula,J.Pavelka CNRLTUBrno,Technicka8,60200Brno,CzechRepublic Phone:+420541143398,Fax:+42057261666,e-mail:sikula@cis.vutbr.cz ABSTRACT Ourinvestigationofbreakdownismainlyorientedtofindabasicparameters describingthephenomenaaswellasitsimpactonreliabilityandqualityofthefinal productthatis GOOD tantalumcapacitor.Basically,breakdowncanbeproduced byanumberofsuccessiveprocesses:thermalbreakdownbecauseofincreasing conductancebyJouleheating,avalancheandfieldemissionbreak,an electromechanicalcollapseduetotheattractiveforcesbetweenelectrodes electrochemicaldeterioration,dendriteformationandsoon.Breakdowncauses destructionintheinsulatorandacrosstheelectrodesmainlybymeltingand evaporation,sometimesfollowedbyignition.Anidentificationofbreakdownnature canbeachievedfromVAcharacteristics.Therefore,wehaveinvestigatedthe operatingparametersbothinthenormalmode,Taisapositiveelectrode,aswellas inthereversemodewithTaasanegativeone.Inthereversemodewehave reportedthatthethermalbreakdownisinitiatedbyanincreaseoftheelectrical conductancebyJouleheating.Consequentlyfollowedinafeedbackcycle consistingoftemperature-conductivity-current-Jouleheat-temperature.In normalmodeanelectricalbreakdowncanbestimulatedbyanincreaseofthe electricalconductanceinachannelbyanelectricalpulseandstoredchargeleads tothesampledestruction.Bothofthesebreakdownshavegotastochastic behaviourandcouldbehardlylocalizedinadvance.
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Following Datasheets	thermistoraging (4 pages) thermistorcurves (4 pages) thermistordissipation (4 pages) thermistorsoperatingtemp (4 pages) thermistorsthermaltimeconstant (4 pages) Thermocouple-1 (3 pages) Thermoelectric_Williams_Mar02_Mag (2 pages) thermopads (4 pages) therolink1000 (4 pages) Thevenin_PR (3 pages)
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