关于Maverick 产品排除及异常值管理的特殊要求

1、 JEDEC标准编码50B.01关于Maverick产品排除及异常值管理的特殊要求目录页码范围1术语及定义2一般要求.33.1先决条件33.2文件3TOC o 1-5 h zMaverick及异常识别管理体系4MPE警报及纠正措施6自我稽核.6附表A：异常识别与排除准则7ForewordThisstandardreplacesbothJESD50AandJESD62A.前言此标准可代替JESD50A和JESD62AIntroductionThecomponentqualityandreliabilityperformancecurrentlybeingachievedbytheelectron

2、iccomponentindustryhasimprovedtoalevelwhereproductanomalieshavebecomeamajorimpacttotheenduser.Thesesituationshavebeencalled“MaverickProduct”problems.TheseproblemscanoccurinanycommodityandthedifferentperformanceofMaverickProductcansignificantlyimpacttheexpectedperformanceofthecommodity.CausesofMaveri

3、ckProductcanvaryacrosstheentirespectrumofprocessesincluding,butnotlimitedto,fabrication,assembly,test,packing,andshippingoperations.引言目前电子产品行业所达到的产品质量及可靠性已改进到了一定程度，在这种程度的异常现象已成为影响终端用户的主要因素。这种现象被称为“Maverick产品”问题。任何商品都会遇到此类问题。Maverick产品的不同特性会严重影响商品的预期特性。Maverick产品的成因在整个工艺过程中随时变化，这种成因包括但不仅限于制造、组装、测试、包装

4、及出货MaverickProductcanresultinoneormorepopulationsofmaterialhavinganactualorpotentialproblemthatmaygoundetecteduntilitsuseinthefinalapplication.Theimpactofthisproductonuserquality,functionalityandfieldreliabilityiscostly,intermsofreplacementcosts,lossofbusiness,andusersatisfaction.Maverick产品可导致一个或多个实

5、际或潜在问题，这些问题直到产品最终被使用时才得以发现。就重置费用、贸易损失及用户满意度而言，Maverick产品对使用者质量、功能及可靠性的影响及其严重。Theprimaryconsiderationistoprotecttheuserfromthepotentialimpactofprocessingvariationanomalies.Problempreventionisaccomplishedbyeliminatingatypicalproductandbyusingfailuremechanism-basedproductmonitors,processcontrols,anduse

6、rdata.Yieldimprovementprogramsdonotnecessarilyprovidethisprotection.Maverickproductsareofteneliminatedusingstatisticalqualitycontroltechniquesincludinglotacceptanceinspections.Duetoinadequate,incomplete,orimpossibletocharacterizedeviceperformancepossibilities,somedevicecharacteristicsorparametersmay

7、beincompletelytestedorinspectedornottestedorinspectedatall;thus,cannotbeeliminatedbystandardstatisticalqualitycontrolbasedonmanufacturerdetermineddataonly.首先考虑的是保护用户远离过程异常变化的潜在影响。通过以失效机理为基础的产品监控、制程控制及用户数据来预防和排除典型产品。合格率改善不一定提供此保护。由于不充分、不完整或根本无法描述组件性能，部分组件的特性或参数不能完全被测试或检验，或者是根本不能被测试或检验；因此，仅基于制造商制定的数据的

8、SPC控制不能排除Maverick产品，需借助包括批量验收等统计品质控制技术来排除Maverick产品Mavericksmayoccurwithineitherspecificationorstatisticalcontrollimitsbutarenotpartofthenormaldistributionthatdescribesthepopulationorprocess.Maverick有可能发生在规格范围内或发生在统计控制限制内，但不会发生在整体或工艺制程的正常分布部分。Outliersareasubsetofmavericksthatarewithinspecificationbu

9、tunusualcomparedtotheprevailingdistribution.异常品是Maverick产品的一部分。此类Maverick产品均在规格范围内，但与主要分布相比不太一样。SPECIALREQUIREMENTSFORMAVERICKPRODUCTELIMINATIONANDOUTLIERMANAGEMENT关于Maverick产品排除及异常值管理的特殊要求1ScopeTheMaverickProductElimination(MPE)andOutlierManagementStandardwascreatedtoidentifysupplierrequirementstoi

10、mprovethedeliveredqualityandreliabilityofelectroniccomponents,andtodeveloptheprogramsanddisciplinerequiredtominimizetheprobabilityoftheuserofelectroniccomponentsreceivingMaverickProduct.1.范围建立Maverick产品排除(MPE)及异常品管理标准以鉴定供应商改善交货品质要求、电子产品可靠性要求、发展计划/准则，将电子产品使用者收到Maverick产品的可能性降到最低。Thisstandardappliesto

11、theidentification,control,anddispositionofMaverickProductthatcanoccurduringfabrication,assembly,test,packing,orshippingofanyelectroniccomponent.Itcanbeimplementedforanentireproductlineortosegregateproductthathasahigherprobabilityofadverselyimpactingqualityorreliability.Theseactivitiesmayrequirespeci

12、aleffortand,thereforecanonlybeactivatedbymutualagreementbetweentheuserandthesupplier.ThissystemisknownasanOutlier(orotherwiseMaverick)IdentificationandManagementSystem(OIMS)此标准适用于识别、控制、处理任何电子产品在制造、组装、测试、包装或出货过程中出现的Maverick。可对整条产线实施此标准，或隔离极有可能影响到品质及可靠性的产品。只有供应商和用户之间达成一致，此措施方可奏效。此系统为“异常(Maverick)识别及管理

13、系统(OIMS)”.OutlierIdentificationandManagementSystem(OIMS)istoidentifyprocessanddefectanomalies,improveprocesscontrols,andimproveend-userqualityandreliabilityandtoidentifytherootcauseoftheOutlierproduct.异常识别及管理系统(OUMS)可识别制程及不良品、改进制程控制、改善终端用户品质及可靠性、鉴定不良品的根本原因。2Termsanddefinitions术语及定义lowerspecification

14、limit(LSL):Thelowerspecificationlimitasdefinedinthecomponentspecification.规格下限(LSL):如产品规格中所定义的规格下限maverickproduct:Productthatexhibitssignificantanomalouscharacteristicsthatmaycauseahigherthan-normalleveloffailureanywhereintheusersapplicationorusersmanufacturingline.Maverick产品：有明显异常特性的产品、在用户使用或用户产线造成

15、高于正常失效水平的产品NOTE1Inthisdefinition,“product”includestheelectroniccomponent,thefirstlevelpacking(e.g.,tray,tube,andtapeandreel),theshippingcontainer,labeling,andpaperwork.注意1：在此定义中，“产品”包括电子产品、首层包装(如托盘、包装管、包装带及卷盘)、运输容器、标签及文书工作。NOTE2Thesesignificantanomalouscharacteristicscanincludeinitialqualitydefects,

16、time-dependentreliabilitydefects,defectsthataffectnextlevelofmanufacturing,defectsinproductdeliveryprocess(suchaslabelingorshippingmedia),anddefectsinbusinessprocess(suchasshippinginformation).Thecharacteristicsmayormaynotbepartofanexistingproductorprocessmonitor,test,orinspectionactivity.注意2：明显异常特性

17、包括：初期品质不良、随时间变化的可靠性不良、影响后续生产的不良、产品交货中的不良(如标签或运输媒介)、贸易过程中的不良(如运输信息)。这些特性可能是或不是现有产品或过程监控、测试、检验的一部分。NOTE3Maverickproductmaycomefromknownnoncompliantproduct,fromcompliantproductthathasasignificantdifferencewhencomparedtotypicalproduct(butisstillwithinspecificationlimits),orfromnormalproductduetosomeprev

18、iouslyunknownorunmonitoredcause.注意3：Maverick产品可来自已知不良品、与“典型”产品(仍在规格限度内)有明显差异的合格品，或者来自先前未知或未受监控的“正常”产品。noncompliantproduct:Productthatfailstocomplywithuserrequirements,manufacturersspecifications,orstatisticalprocesscontrollevelsthatthesupplierhasdeemedcriticaltoreliability.不合格品：不符合用户要求、生产商规格、或供应商认为对

19、可靠性起关键作用的统计制程控制水平的产品outlierproduct:Productthatmeetsmanufacturerspecificationsanduserrequirementsbutexhibitsanomalouscharacteristicswithrespecttoanormalpopulation(anexampleofwhichisdepictedbythehistograminthefigure),andwhichmaybesubjecttoahigher-than-normalleveloffailuresintheusersapplication.异常产品：满足

20、生产商规格、用户要求，但是在总体上存在异常特性的产品(如下图)。此类产品在用户使用中的失效有可能高于正常水平。Figure1Graphicalrepresentationofstatisticaltestlimitsandoutliers图1统计测试控制线及异常的图形表示producttraceability:Amethodologyfortracingproducts,forwardorbackward,throughthemanufacturingflowtoisolatematerialsthatcouldbesimilartoproductidentifiedashavingquali

21、tyorreliabilityproblems.产品可追溯性：是向前或向后追踪产品的一种方法，通过加工流程来隔离物料，这些物料类似于标识有品质问题或可靠性问题的产品。NOTE1Forforwardtraceability,allproductsassociatedwithaprocessstepmustbeidentifiable.注意1：向前追溯，与流程步骤相关的所有产品必须可识别。NOTE2Backwardtraceabilityistheidentificationoftheproductatallstagesfromshippedproductthroughrawmaterial.注意

22、2：向后追溯是指通过原材料，从出货产品在所有各个阶段的标识。rework:(1)Therepetitionofanyoperationorprocesssteporsequencethatcreatesorchangesaportionofthedevicesstructure,assembly,testing,orpacking.返工：(1)任何操作、制程步骤、建立或更改设备结构顺序、组装、测试或包装的重复(2)Theintentionalexecutionofoperationsnotnormallypartofthemanufactureoftheitem.(2)不包括蓄意返工robus

23、tmeanrobustvariance:Ameanvariancecalculatedusingarobustestimationprocedure.Robust均值(robust方差)：使用robust评估程序计算均值(方差)robustestimation:Aprocedureforestimatingstatistics,e.g.,meanandvariance,thatperformswellwhentherearedepartures(outliers)fromtheidealconditionsthathavebeenpostulatedforthemodel.Robust评估：是

24、用于评估统计的程序，如：当假设给模型的理想条件出现异常时，均值和方差表现良好。NOTETheestimateofthesamplemeanand/orvarianceisoftenmaderobustbyarejection-of-outliersprocedureortheuseofatrimmedmean.注意：通过异常排除程序或使用截尾平均数,Robust可评估样品均值、方差upperspecificationlimit(USL):Theupperspecificationlimitasdefinedinthecomponentspecification规格上限(USL)：如产品规格中所

25、定义的规格上限3Generalrequirements般要求Prerequisites先决条件311Statisticalprocesscontrol(SPC)program统计制程控制(SPC)程序EachsuppliershalldefineandimplementaStatisticalProcessControl(SPC)systeminvolvingallcriticalprocessnodes.Otherusefulreferencestocorrelateproductcharacteristicsandparameters,whereapplicable,toprocessco

26、ntrolsincludeJEP121,JEP132,andJEP131.每位供应商都应制定和实施涉及关键过程的统计制程控制(SPC)系统。其他对制程控制有用的、与产品特性及参数相关的参考包括：JEP121、JEP132、JEP131.312Failuremechanismdrivenreliabilitymonitoringprogram失效机理驱动可靠性监控程序Eachsuppliershallhaveafailuremechanism-drivenreliability-monitoringprogramfordesignandcontrolofprocessesandproducts.

27、(Ref.JESD659orequivalent.)每位供应商对制程、产品的设计、控制都应有失效机理驱动可靠性监控程序(参考文献ESD659或类似文献)Productchangenotification(PCN)program产品变更通知(PCN)程序EachsuppliershallhaveaPCN(ProductChangeNotification)Programinplace.(Ref.JESD46orequivalent.)每位供应商都应有产品变更通知程序(参考文献JESD46或类似文献)314OutlierIdentificationandManagementSystemforEle

28、ctronicComponents电子元件异常识别及管理系统Eachsuppliershallhaveanoutlieridentificationandmanagementsysteminplaceforsettingyieldcutlimits.每位供应商都应有异常识别及管理系统以设定合格率目标值Documentation文件3.2.1MPEdocumentationrequirementsMPE文件要求Eachsuppliershallmaintaindocumentation(perASQC/ANSI-Q90orISO9000QualityRecordsrequirements)sup

29、portingthefollowingitemstoensureprogramconsistencythroughtime.每位供应商都应维护相关文档文件(ASQC/ANSI-Q90或IS09000品质记录要求)以支持下列项目来确保程序的一致性：a)ThedetailsofthesuppliersimplementationofMPE.供应商实施MPE的具体细则b)RecordsofallcasesofsuspectedOutlier(orotherwiseMaverick)Product.Theresultsofinvestigativeactivityshallberecorded.Any

30、correctiveactiontakenasaresultshallbedocumented.所有案例中怀疑为“异常(Maverick)产品”的所有记录。应记录调查结果。采取的任何措施都应归档记录。c)Recordsofallsignificantlyhigherfalloutasreportedbycustomers.Thisfalloutcouldbeatboardassembly,atsystemassembly,orinthefield.Asummaryofthesuppliersinvestigativeactivityshallberecorded.Ifthehigherfall

31、outwasverifiedtobeanMPEincident,thenthesuppliermustdocumentthefollowing:客户报告中所有较多的失效记录。这些失效可能会发生在板级组转、系统装配、或电场中。记录供应商调查汇总。如果这些大量失效被验证为是MPE意外，供应商应作以下归档记录：1)Actiontakenbecauseoftheincidenttoresolvetheusersproblem.采取措施解决用户问题RootcauseoftheOutlier(orotherwiseMaverick)Product.异常品的根本原因Correctiveactiontaken

32、bythesupplierorusertoeliminaterecurrence.(Ref.JESD671orequivalent.)供应商或用户采取纠正措施排除异常再次发生(参考文献JESD671或类似文献)NOTETheserecordsmaybesharedwiththeuseratthediscretionofthesupplier.注意：由供应商决定这些记录是否与用户共享Documentation(contd)文件(续)Recordretention记录保存Allincidencesrecordedin3.2.1b)and3.2.1c)shallberetainedforaminim

33、umof2years.Wherepractical,retentionoftheserecordsforfiveyearsisrecommended.在3.2.1b)和321c)中所涉及的记录至少应保留2年。在实际情况下，推荐保留这些文件5年MaverickandoutlieridentificationandmanagementsystemMaverick及异常识别管理系统OIMStestlimitsrepresenttheapplicationofstatisticaltechniquesfortheremovalofabnormalpartsduringpartleveltesting(

34、seeFigure2.4.1).Acomponentspecificationusuallydefinestherequirementsneededfortheparttoworkproperlyintheapplication.Everypart(partasusedherereferstoasupplierpartnumber)isbuiltwithaparticulardesignandprocessthat,ifprocessedcorrectly,shallyieldacertainconsistentsetofcharacteristictestresults.OIMS测试控制线指

35、的是在产品水准测试期间运用统计技术排除不良品(参考图241)。产品规格通常定义了产品在使用时可正常工作的要求。每件产品(指供应商产品编码)都有其特定设计和工艺。如果处理无误，这些特定设计和工艺会产生一系列一致性的测试结果OIMSusesstatisticaltechniquestoestablishthelimitsonthesetestresults.OIMStestlimitsaresetuptoremovetheseoutliers(partswhoseparametersarestatisticallydifferentfromthetypicalpart)andshouldhavem

36、inimalyieldimpactoncorrectlyprocessedpartsfromawell-controlledprocess.Thetestlimitsmayrepresenttestdatahavingeitherasymmetricalorskeweddistribution.Thistestmethodologyisnotlimitedtothestandardcomponentspecificationtests,butmayalsoincludeextendedoperatingtests(testsbeyondthecomponentspecificationrequ

37、irements)toimprovetheabilitytodetectspecialabnormalconditionsandincreasethesensitivityofthistestingtechnique.Theonlyrestrictiononextendedoperatingtestsisthatthetestshallnotreducethereliabilityofthepartsthatpassthetest,andtestdatamustbeobtainedunderthesametestconditions.OIMS通过统计技术制定测试结果控制。制定OIMS测试控制线

38、以排除异常(异常产品的各项参数与典型产品的不一样)。建立OIMS测试控制线应对受控良好条件下生产出来的产品的合格率影响最小。此测试控制线可表现为有对称性或有偏离的测试数据。此测试方法不仅限于标准件规格的测试，还包括了延伸测试(超出产品规格要求的测试)，这种延伸测试可改善探测特殊异常条件的能力、提升测试技术的灵敏度。延伸测试唯一的约束就是：不能降低测试合格品的可靠性，测试数据必须是在相同的测试条件下才可得到。Thefollowingsectionestablishestheminimumimplementationrequirementsforthisstandard以下为实施此标准的最低要求3

39、.3.1TestLimits测试控制线Thesuppliershallestablishaminimumandmaximumacceptableyieldatcriticalprocesssteps(atleastone)byproductorproductfamily(Ref.EIA-557orequivalent).Anyproductabovethemaximumacceptableyieldmustbeevaluatedtodeterminewhethertheproductwastestedproperly.Generallyacceptedstatisticalmethodssha

40、llbeusedtosetminimumandmaximumyieldlimits.依据产品或产品系列(参考文献EIA-557或相似文献)，供应商应为关键制程步骤制定可接受的最低和最高合格率。超过最高可接受合格率的任何产品都必须被重新评估以确保产品测试是否正确。一般已接受的统计方法被用于制定最小和最大合格率。NOTEsmalllotsizesmaybeexemptedfromthemaximumyieldcalculation.注意：小批量可不必计算最高合格率Inaddition,thesuppliershallestablishoutlierlimitsforimportantcharact

41、eristicswiththegreatestprobabilityofaffectingqualityandreliability.另外，供应商应为极可能影响产品品质及可靠性的重要特性制定异常限制。Whereapplicable,thesuppliershallestablishminimumandmaximumcriteriaforacceptablesamplingresults(Ref.EIA-554orequivalent).在适用情况下，供应商应为可接受的抽检结果制定最低和最高标准(参考文献EIA-554或类似文献)Thesuppliershallestablishanduseas

42、tatisticalmethodforidentifyingandremovingpartswithelectricallyabnormalcharacteristics(outliers),withdefinedoutlierelectricaltestlimits.AguidelineofhowtoapplyoutlieridentificationandremovalcanbefoundinAnnexB.借助已定义的异常电气测试控制线，供应商应制定及使用统计方法识别并排除电气性能异常的产品。附件B内有如何识别异常和排除异常。Testlimitsmaybeeitherstaticordyn

43、amic.Staticlimitsareestablishedthenusedwithoutmodificationforsomeperiodoftime.Dynamiclimitsstartwithstaticlimitsbutestablishnewtestlimitsonacontinualbasis.(Dynamiclimitsbetteraccommodateshiftsinthedistributionagainstwhichoutlierbehaviorisjudgedandminimizefalserejection.)測試控制線可以是靜態或動態的。靜態測試線在建立並使用後的一

44、段時間內不作修改動態測試線由靜態測試線開始，並不斷地建立新的測試(線動態測試線能更好地應對分佈的偏移使異常品判斷更準確並減少誤判)Maverickandoutlieridentificationandmanagementsystem(contd)Maverick异常识别及管理系统(续)Noncompliantproduct不合格产品AllnoncompliantproductsshallbeevaluatedpriortoshipmenttoensurethatitisnotOutlier(orotherwiseMaverick)Product.在出货之前评估所有不符合要求的产品，确保他们是不

45、是异常产品EvaluationmaybeintheformofaMaterialsReviewBoard(MRB)orequivalentpersonnel.评估的形式可能是物料审核委员会(MRB)或同等机构Aproduction,assembly,ortestlotthatisoutofStatisticalProcessControlmaystillmeetspecifications.不在统计制程控制范围内的生产、组装或测试批次也有可能符合要求。OutofcontrolmaterialcouldbeapotentialOutlier(orotherwiseMaverick)lot,but

46、itisnotguaranteed.NormallythiskindofexcursionshalltriggeranMRBtodeterminesuitabilityforcustomeruse.不受控物料有可能是潜在异常(Maverick)批次，但是也不一定。通常情况下，由MRB来决定此类产品是否适合客户使用。Somecustomersmayhaveprocurementdocumentsthatshallnotallowtheshipmentofnoncompliantproductwithoutformalnotificationandadocumentedapproval.部分客户可

47、能有程序文件，此文件不允许没有正式通知及没有正式批准文件的不合格品出货。Robustcomponents坚固元件Suppliersmustdriveactionstoreducetheexposureoftheusertofailuresduetodesignrelatedsensitivitiestoprocessvariations.供应商必须采取措施降低与工艺变更有关的设计所引起的用户使用失效Supplierprocessmigration/automation供应商工艺提升/自动化Processes(e.g.,manufacturing,assembly,testing,packing

48、,shipping,control,notification)thataresensitivetovariationsthatareknowntoimpactproductquality,functionality,orreliabilityshouldmigratewherebeneficialtoautomatedmethodstominimizethesevariations.对那些会影响产品品质、功能或可靠性的变化较为敏感的工艺(如加工、组装、测试、出货、控制、通知)，应将其提升到自动化以最小化这些变化Techniquestopreventproductdefectscausedbyh

49、umanerror(errorproofing)arepreferred首选可预防人为不良的相关技术Producttraceability产品可追溯性Bothforwardandbackwardtraceabilityisrequired.ExposurestotheusermustbedefinedandboundedifaOutlier(orotherwiseMaverick)Lot/Producthasbeenidentified.Suppliersmustbeabletoidentifyproduct(s)affectedandprovidedistinguishingmarking(

50、lot/datecode)ofaffectedproduct.要求向前、向后追溯产品。必须标识并隔离客户端的不良Maverick)批次/产品。供应商必须标识受影响的产品，并提供受影响产品的区别标记(如生产批次、生产日期)。Enhancedflows巩固流程WhereprocessesarenotrobustortherehasbeenahistoryofpastOutlier(orotherwiseMaverick)product,enhancedflowsshallbedeveloped.Theseenhancedflowscanincludeburnin,PPMmonitoring,var

51、iablestesting,specialstresses/tests,andotherenhancementsdesignedtofurtherreducetheriskoftheuserreceivingOutlier(orotherwiseMaverick)product.对于那些不牢靠的工艺，或是那些曾出现过不良(Maverick)品的工艺，应加强、巩固流程控制，包括：burnin、PPM监控、变量测试及其他巩固设计，以近一步降低用户收到不良(Maverick)品的风险。Failure-Mechanism-DrivenReliabilityMonitoring失效机理驱动可靠性监控Fa

52、ilure-Mechanism-DrivenReliabilityMonitoringasdescribedinJESD659shouldbeusedtokeepfailuremechanisms,whichareknowntocontributetoMaverickproducts,undercontrol.如JESD659中所述，失效机理驱动可靠性监控应使利于Maverick产品的失效机理处于受控状态。338Rework返工Thesuppliershal1供应商应：Maintainupdateddocumentationofallallowedreworkoperations.维护更新的所

53、有批准返工操作的文件Performreliabilityevaluationsonreworkedproducttoensurethatthereliabilityandgeneralqualityofreworkedproductisequivalenttoorbetterthannon-reworkedproduct.评估返工产品的可靠性，以保证返工品的可靠性及其一般品质与非返工品相当，或者甚至比非返工品还要好。Periodicallyreviewtheneedforcontinuationofeachreworkoperationorobtainapprovalfromtheuseras

54、requiredbycontract.定期审查是否有必要继续返工，或如合同要求，从用户处获得认可IfrootcauseofanMPEincidentisdeterminedtoberelatedtoareworksteporprocess,thejustificationforcontinuingthatsteporprocessmustbere-evaluated.如果判定MPE意外与返工步骤或返工工艺有关的话，那么继续此步骤或此工艺的依据必须被重新评估。NOTEThisinformationmaybesharedwiththeuseratthediscretionofthesupplier

55、注意：由供应商决定这些信息是否与用户共享MPEalertsandcorrectiveactionsMPE警报及纠正措施Thesuppliersqualitysystemshallincludetheprovisionfornotificationoftheuserofanyproductquality,reliability,ordeliveryjeopardyasaresultoffailedrequirementsorverifiedOutlier(orotherwiseMaverick)Product.Thealertshouldincludethefollowinginformatio

56、n:供应商品质体系应包含“用户通知条款”：由于未达成要求或由于不良(Maverick)品而引起的任何产品品质、可靠性或交货风险等通知条款。此警报应包含以下信息：product(s)affected受影响的产品-distinguishingmarking(lot/datecodeinformation)ofaffectedproduct记识另(生产日期、生产批次信息)anydirectionsforinitialactions(i.e.,returnproduct,customerscreens)初步行动指示(如，退货，客户审查)rootcause根本原因-correctiveaction,bo

57、thshorttermandlongterm(ifappropriate)短期和长期纠正措施-correctiveactionimplementationdates.纠正措施实施日期4Selfaudit自我稽核Aself-auditorself-assessmentthatincludeseachareaoftheMPEprogramshallbeperformedatleastonceayear.Morefrequentauditsorassessmentsarerecommendedfornewtechnologies,newlines,neworchangedprocesses,crit

58、icalareas(asdefinedbythesupplier)andaftercorrectiveactionshavebeenimplemented.Theseshouldincludesuppliersub-contractorsMPEprogramsandimplementationofsuppliersMPEprogramrequirementsatsub-contractors.Ascheduleforauditorassessmentshallbedevelopedandmaintained(referenceANSI/ASQCQ90orIS09000).自我稽核或自我评估包括

59、MPE的方方面面，每年至少一次。对于新技术、新产线、新的或变更了的工艺、关键方面(如供应商所定义的)及实施纠正措施后，推荐一年进行多次自我稽核或自我评估。这些自我稽核、自我评估应包含供应商分包商MPE项目及供应商MPE项目要求在分包商处的实施。应制定并维护稽核、评估计划(请参考ANSI/ASQCQ90或IS090000)。AnnexA(normative)Guidelinesforoutlieridentificationandremoval附件A(标准)异常识别及排除指导A1Scope范围Thisguidelinepresentsastatistics-basedmethodforident

60、ifyingandremovingpartswithelectricallyabnormalcharacteristics(outliers)fromasemiconductordevicepopulation.Theelectricaltestlimitsusedarebasedonasampleoftheelectricaltestresultsforthatparticularpartwithitsuniquedesignandprocessing.Eachpartdesignanditsassociatedprocessingtendtoshowauniquedistributiono