ESD 基本原理和防护课件

ElectrostaticDischarge(ESD)Improvement

静电放电(ESD)改进ESDGeneration静电的产生ESDisgeneratedperthefollowing:静电产生于以下几点FrictionandSeparation摩擦和分离Induction感应CapacitanceVariation容量变化ESDDamage静电的损害Catastrophicfailure突变失效Whenacomponentisdamagedtothepointwhereitis‘dead’,anditwillneverfunctionagain.ThisistheeasiesttypeofESDdamagetobedetectedduringtesting当一个组件损坏到‘死’，它将永远不会再次运行。这是能够检测中的静电放电损伤的最简单的类型Latentfailure潜在失效ESDweakensorwoundsthecomponenttothepointwhereitwillstillfunctionproperlyduringtesting,butovertimethewoundedcomponentwillcausepoorsystemperformanceandwilleventuallyresultincompletesystemfailure.被ESD削弱或创伤的元件，虽然其在测试过程中仍能正常工作，但随着时间的推移，受伤的元件将导致系统性能降低，最终将导致系统完全失效。Itoccursafterfinalinspectionorinthehandsoftheend-consumer,thecostforrepairisveryhigh.这种损伤发生在最终检验或在最终消费者手中，维修费用很高。Thistypeofdamageishardtofind,anditseverelyaffectsthereputationoftheproductbrand.这种类型的损伤是很难找到的，它严重影响产品的品牌声誉。ESDSensitivity静电的敏感Itistouchableifstaticelectricityisover3000V

如果静电超过3000V，它是可触觉的Itisaudibleifstaticelectricityisover5000V如果静电超过5000V，它是可听到的Itisseeableifstaticelectricityisover10000V如果静电超过10000V，它是可看见的SusceptibilityofVariousDevicesExposedtoESD暴露在静电区各种设备的敏感程度ESDbyahumanbeingcoulddamageanycommon-seensemiconductors由人产生的静电可以破坏任何常见的半导体ESDControlPlan静电控制方案ESDcontrolplanneedstocoverthefollowingquestions:静电控制方案需要包括以下问题：WhyhaveESDprotectionandcontrol?为什么静电要保护和控制？WithoutappropriateESDprotectionandcontrol,thedamageandthelosscouldbesignificantandcostly.Staticelectricitycan’tbeeliminatedbutcanbecontrolled没有适当的静电保护和控制，损害，损失可能代价高昂。静电不能消除但可以控制WhoshouldparticipateinESDcontroltraining?谁应该参与静电控制训练？PersonnelwhoareinSuppliers,R&D,Purchasing,Warehouse,Producing&Testing,Packaging,CustomerSupport这些人员来自：供应商，研发，采购，仓库，生产&测试，包装，客户支持过程Where

istheESDprotectionareaandESDcontrolarea?哪里是静电保护区和控制区？PlacesatSuppliers,Labs,IQC,Storage,ProductionLine,AssemblyandTest,PackagingandRepairing这些区域在供应商，实验室，来料检验，储存，生产线，组装和测试，包装和维修What

tocontrol?要控制什么？Environment(floor,humidity,bench,jig,etc.)环境（地面，湿度，工作台，夹具，等等）Personnel(clothing,shoes,grounding,etc.)人员（服装，鞋子，接地，等等）Material(incoming,transporting,packaging,etc.)物料（来料，运输，包装，等等）How

todo(whatrulestofollow)?如何做（需要采用什么样的规则）AllESDsensitiveitemswillbehandledinESDprotectionarea所有静电敏感的项目必将在静电保护区内处理ThestorageandtransportationofESDsensitivecomponents,circuitboards,assembliesandsystems(bothreparableandserviceable)havetobeinstaticshieldingandnon-chargegeneratingpackagesorcontainers静电敏感元件，电路板，组件和系统（包括修理和维修）的储存和运输必须放置在静电屏蔽和非电荷产生的包装或容器ThewholeESDprotectionandcontrolprocessneedtobetestedandmonitored整个静电保护和控制过程中需要进行检测和监测EnvironmentControl环境控制TemperatureandHumidity温度和湿度HighESDriskarea(ductionlineandrepairstation):静电高危险区域（如生产线和维修站）：Temperature:20-30ºC温度：20-30摄氏度Humidity(RH):45-75%湿度(相对湿度）：45-75%Otherareas:其它区域Temperature:20-30ºC温度：20-30摄氏度Humidity(RH):30-75%湿度(相对湿度）：30-75%LocalenvironmentneedtobeadjustedforsomeESDsensitiveitemswithspecialrequirements当地环境需要调整针对有一些特殊要求的静电敏感材料GroundingWorkstationinParallel工作台并行接地AllEPAworkstationsshallbecoveredwithESDprotectionpads(staticdissipativepads)所有静电保护区域的工作站应覆盖静电保护垫（静电耗散垫）AllEPAworkstationsshallbegroundedinparalleltoonecommongroundline所有静电保护区域的工作站必须并行接地于一个共同的接地线ESDPolicy静电防护政策TestwriststrapsandESDfootweardaily每日测试腕带和静电鞋Keepwristbandsnug保持手腕带舒适并紧绷的OnlytrainedorescortedpeopleareallowedinESDprotectedarea

只有经过培训或护送人员方可允许进入静电防护区Keepworkareacleanandclearofinsulators保持工作区域的清洁和清除绝缘物Handleun-packagedESDsensitiveitemsonlywhengrounded

只有当接地处时，才能处理未包装的静电敏感产品Visuallycheckallgroundingcordstomakesuretheyareconnected.

目视检查所有接地线确保其良好的连接。MakesureIonizersaremaintainedandairflowisnotblocked

确保离子发生器已妥善地维护和空气是流通的UseshieldedpackagingforshippingorstoringESDsensitiveitemsoutsidetheESDprotectedarea使用屏蔽用于运输或储存的静电敏感产品在静电保护区外GroundConductors,includingpeople接地导体，包括人NeutralizeinsulatorswithIonizers中和绝缘和离子ShieldESDsensitiveitemswhenstoringortransportingoutsideEPA

在静电防护区外贮存或运输时，要屏蔽静电敏感产品。Storage,PackingandHandling

存储，包装和处理ESDsensitiveitemsmustalwaysbeputinprotectivepackagingorcontainersbeforemovingfromanESDprotectivearea

当静电敏感物品搬到静电防护区之前，必须放入保护性包装或容器ShieldingisnecessarytopreventasensitivedevicefrombeingchargedbyexposuretoESDorbeingtouchedbyachargedobjectduringtransportationorstorage屏蔽是必要的，用于防止敏感器件被暴露的静电或运输、存储过程中接触到的带电物体Marking,LabelingandSigns

标记，标签和标志ESD-protectedareasshallberecognizedbythesignsorplacardsthataredisplayedbeforepersonnelenterthearea.TheseareasshallbemarkedoffwithyellowESDtapeonthefloor静电保护区应由显示的标志或标牌进行识别当人员进入此区域.这些地区应当标上黄色的防静电胶带在地板上Marking,LabelingandSigns

标记，标签和标志ShippingContainerLabel集装箱标签GroundingPointSign接地点符号Marking,LabelingandSigns

标记，标签和标志Unitpacklabel部品包装标签Equipmentlabel设备标签ESDWristStrapsandFootStraps

防静电手腕带，脚带Cordedwriststraps:

捆扎式手腕带Cordlesswriststraps:无绳式手腕带FootStraps:鞋带ESDshoes:静电鞋Commonly-seenESDConcerns

常见的ESD关注事项NowriststrapswhilehandlingchipsorPCBboards没有带