Surface Mount Aluminum Electrolytic Capacitors – EXV Series, +105°C
Construction Data
Theꢀmanufacturingꢀprocessꢀbeginsꢀwithꢀtheꢀanodeꢀfoilꢀbeingꢀ
electrochemicallyꢀetchedꢀtoꢀincreaseꢀtheꢀsurfaceꢀareaꢀandꢀthenꢀ
“formed”ꢀtoꢀproduceꢀtheꢀaluminumꢀoxideꢀlayer.ꢀBothꢀtheꢀanodeꢀandꢀ
cathodeꢀfoilsꢀareꢀthenꢀinterleavedꢀwithꢀabsorbentꢀpaperꢀandꢀwoundꢀ
intoꢀaꢀcylinder.ꢀDuringꢀtheꢀwindingꢀprocess,ꢀaluminumꢀtabsꢀareꢀ
attachedꢀtoꢀeachꢀfoilꢀtoꢀprovideꢀtheꢀelectricalꢀcontact.
Extended cathode
Anode foil
Foil tabs
Theꢀdeck,ꢀcompleteꢀwithꢀterminals,ꢀisꢀattachedꢀtoꢀtheꢀtabsꢀandꢀthenꢀ
foldedꢀdownꢀtoꢀrestꢀonꢀtopꢀofꢀtheꢀwinding.ꢀTheꢀcompleteꢀwindingꢀ
isꢀimpregnatedꢀwithꢀelectrolyteꢀbeforeꢀbeingꢀhousedꢀinꢀaꢀsuitableꢀ
container,ꢀusuallyꢀanꢀaluminumꢀcan,ꢀandꢀsealed.ꢀThroughoutꢀtheꢀ
process,ꢀallꢀmaterialsꢀinsideꢀtheꢀhousingꢀmustꢀbeꢀmaintainedꢀatꢀtheꢀ
highestꢀpurityꢀandꢀbeꢀcompatibleꢀwithꢀtheꢀelectrolyte.
Tissues
Cathode foil
Eachꢀcapacitorꢀisꢀagedꢀandꢀtestedꢀbeforeꢀbeingꢀsleevedꢀandꢀpacked.ꢀ
Theꢀpurposeꢀofꢀagingꢀisꢀtoꢀrepairꢀanyꢀdamageꢀinꢀtheꢀoxideꢀlayerꢀ
andꢀthusꢀreduceꢀtheꢀleakageꢀcurrentꢀtoꢀaꢀveryꢀlowꢀlevel.ꢀAgingꢀisꢀ
normallyꢀcarriedꢀoutꢀatꢀtheꢀratedꢀtemperatureꢀofꢀtheꢀcapacitorꢀandꢀ
isꢀaccomplishedꢀbyꢀapplyingꢀvoltageꢀtoꢀtheꢀdeviceꢀwhileꢀcarefullyꢀ
controllingꢀtheꢀsupplyꢀcurrent.ꢀTheꢀprocessꢀmayꢀtakeꢀseveralꢀhoursꢀtoꢀ
complete.
Etching
Forming
Winding
Decking
Impregnation
Assembly
Aging
Damageꢀtoꢀtheꢀoxideꢀlayerꢀcanꢀoccurꢀdueꢀtoꢀvarietyꢀofꢀreasons:
ꢀ •ꢀSlittingꢀofꢀtheꢀanodeꢀfoilꢀafterꢀforming
ꢀ •ꢀAttachingꢀtheꢀtabsꢀtoꢀtheꢀanodeꢀfoil
ꢀ •ꢀMinorꢀmechanicalꢀdamageꢀcausedꢀduringꢀwinding
Aꢀsampleꢀfromꢀeachꢀbatchꢀisꢀtakenꢀbyꢀtheꢀqualityꢀdepartmentꢀafterꢀ
completionꢀofꢀtheꢀproductionꢀprocess.ꢀThisꢀsampleꢀsizeꢀisꢀcontrolledꢀ
byꢀtheꢀuseꢀofꢀrecognizedꢀsamplingꢀtablesꢀde ꢀnedꢀinꢀBSꢀ6001.
Theꢀfollowingꢀtestsꢀareꢀappliedꢀandꢀmayꢀbeꢀvariedꢀatꢀtheꢀrequestꢀ
ofꢀtheꢀcustomer.ꢀInꢀthisꢀcaseꢀtheꢀbatch,ꢀorꢀspecialꢀprocedure,ꢀwillꢀ
determineꢀtheꢀcourseꢀofꢀaction.
Testing
Electrical:
• Leakage current
• Capacitance
• ESR
ꢀ •ꢀImpedance
• Tan Delta
Mechanical/Visual:
• Overall dimensions
• Torque test of mounting stud
• Print detail
• Box labels
• Packaging, including packed
quantity
Sleeving
Packing
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com
A4003_EXV • 12/7/2017 18