剪切力实验标准

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1、DIESHEARSTRENGTH1.PURPOSE.Thepurposeofthistestistodeterminetheintegrityofmaterialsandproceduresusedtoattachsemiconductordieorsurfacemountedpassiveelementstopackageheadersorothersubstrates.Thisdeterminationisbasedonameasureofforceappliedtothedie,thetypeoffailureresultingfromthisapplicationofforce(i

2、ffailureoccurs)andthevisualappearanceoftheresidualdieattachmediaandsubstrate/headermetallization.2.APPARATUS.Thetestequipmentshallconsistofaload-applyinginstrumentwithanaccuracyof5percentoffullscaleor50grams,whicheveristhegreatertolerance.Acirculardynamometerwithaleverarmoralinearmotionforceapplyi

3、nginstrumentmaybeusedtoapplytheforcerequiredfortesting.Thetestequipmentshallhavethefollowingcapabilities:a.Adiecontacttoolwhichappliesauniformdistributionoftheforcetoanedgeofthedie(seefigure2019-1).Acompliant(conforming)material(e.g.,nailpolish,tape,etc.)maybeappliedtothefaceofthecontacttooltoensu

4、euniformforcedistributionontheedgeofthedie.b.Provisionstoassurethatthediecontacttoolisperpendiculartothediemountingplaneoftheheaderorsubstrate.c.Arotationalcapability,relativetotheheader/substrateholdingfixtureandthediecontacttool,tofacilitatelinecontactontheedgeofthedie;i.e.,thetoolapplyingthefor

5、cetothedieshallcontactthedieedgefromend-to-end(seefigure2019-2).d.Abinocularmicroscopewithmagnificationcapabilitiesof10Xminimumandlightingwhichfacilitatesvisualobservationofthedieanddiecontacttoolinterfaceduringtesting.3.PROCEDURE.Thetestshallbeconducted,asdefinedherein,ortothetestconditionsspecif

6、iedintheapplicablespecificacquisitiondocumentconsistentwiththeparticularpartconstruction.Alldiestrengthtestsshallbecountedandthespecificsampling,acceptance,andaddedsampleprovisionsshallbeobserved,asapplicable.3.1Shearstrength.Aforcesufficienttoshearthediefromitsmountingorequaltotwicetheminimumspec

7、ifiedshearstrength,whicheveroccursfirst,shallbeappliedtothedieusingtheapparatusof2above.NOTE:Forpassiveelementsonlyattachedattheendterminations,theareausedtodeterminetheforceappliedshallbethetotalareaofthemountin