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EEV337M016A9MAA Datasheet(PDF) 6 Page - Kemet Corporation |
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EEV337M016A9MAA Datasheet(HTML) 6 Page - Kemet Corporation |
6 / 16 page 6 © 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 Mounting Positions (Safety Vent) Inoperation,electrolyticcapacitorswillalwaysconductaleakagecurrentwhichcauseselectrolysis.Theoxygenproducedby electrolysiswillregeneratethedielectriclayerbut,atthesametime,thehydrogenreleasedmaycausetheinternalpressureofthe capacitortoincrease.Theoverpressurevent(safetyvent)ensuresthatthegascanescapewhenthepressurereachesacertainvalue. Allmountingpositionsmustallowthesafetyventtoworkproperly. Installing • Ageneralprincipleisthatlower-usetemperaturesresultinalonger,usefullifeofthecapacitor.Forthisreason,itshouldbe ensuredthatelectrolyticcapacitorsareplacedawayfromheat-emittingcomponents.Adequatespaceshouldbeallowedbetween componentsforcoolingairtocirculate,particularlywhenhighripplecurrentloadsareapplied.Inanycase,themaximumcategory temperature must not be exceeded. • Donotdeformthecaseofcapacitorsorusecapacitorswithadeformedcase. • Verifythecorrectpolarizationofthecapacitorontheboard. Itisrecommendedthatcapacitorsalwaysbemountedwiththesafetydeviceuppermostorintheupperpartofthecapacitor. • Ifthecapacitorsarestoredforalongtime,theleakagecurrentmustbeverified.Iftheleakagecurrentissuperiortothevaluelistedin thiscatalog,thecapacitorsmustbereformed.Inthiscase,theycanbereformedbyapplicationoftheratedvoltagethroughaseries resistorapproximately1kΩforcapacitorswithV R≤160V(5Wresistor). • Inthecaseofcapacitorsconnectedinseries,asuitablevoltagesharingmustbeused. Inthecaseofbalancingresistors,theapproximateresistancevaluecanbecalculatedas:R=60/C KEMETrecommends,nevertheless,toensurethatthevoltageacrosseachcapacitordoesnotexceeditsratedvoltage. Application and Operation Guidelines Electrical Ratings: Capacitance (ESC) Capacitanceismeasuredbyapplyinganalternatevoltageof≤0.5Vatafrequencyof120or100Hzand20°C. Temperature Dependence of the Capacitance Capacitanceofanelectrolyticcapacitordependsupontemperature:withdecreasingtemperaturetheviscosityoftheelectrolyte increases,therebyreducingitsconductivity. Capacitancewilldecreaseiftemperaturedecreases.Furthermore,temperaturedriftscausearmaturedilatationand,therefore, capacitancechanges(upto20%dependingontheseriesconsidered,from0to80°C).Thisphenomenonismoreevidentfor electrolyticcapacitorsthanforothertypes. |
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