ESD 基本原理和防護(hù)課件

ElectrostaticDischarge(ESD)Improvement

靜電放電(ESD)改進(jìn)ESDGeneration靜電的產(chǎn)生ESDisgeneratedperthefollowing:靜電產(chǎn)生于以下幾點FrictionandSeparation摩擦和分離Induction感應(yīng)CapacitanceVariation容量變化ESDDamage靜電的損害Catastrophicfailure突變失效Whenacomponentisdamagedtothepointwhereitis‘dead’,anditwillneverfunctionagain.ThisistheeasiesttypeofESDdamagetobedetectedduringtesting當(dāng)一個組件損壞到‘死’，它將永遠(yuǎn)不會再次運行。這是能夠檢測中的靜電放電損傷的最簡單的類型Latentfailure潛在失效ESDweakensorwoundsthecomponenttothepointwhereitwillstillfunctionproperlyduringtesting,butovertimethewoundedcomponentwillcausepoorsystemperformanceandwilleventuallyresultincompletesystemfailure.被ESD削弱或創(chuàng)傷的元件，雖然其在測試過程中仍能正常工作，但隨著時間的推移，受傷的元件將導(dǎo)致系統(tǒng)性能降低，最終將導(dǎo)致系統(tǒng)完全失效。Itoccursafterfinalinspectionorinthehandsoftheend-consumer,thecostforrepairisveryhigh.這種損傷發(fā)生在最終檢驗或在最終消費者手中，維修費用很高。Thistypeofdamageishardtofind,anditseverelyaffectsthereputationoftheproductbrand.這種類型的損傷是很難找到的，它嚴(yán)重影響產(chǎn)品的品牌聲譽。ESDSensitivity靜電的敏感Itistouchableifstaticelectricityisover3000V

如果靜電超過3000V，它是可觸覺的Itisaudibleifstaticelectricityisover5000V如果靜電超過5000V，它是可聽到的Itisseeableifstaticelectricityisover10000V如果靜電超過10000V，它是可看見的SusceptibilityofVariousDevicesExposedtoESD暴露在靜電區(qū)各種設(shè)備的敏感程度ESDbyahumanbeingcoulddamageanycommon-seensemiconductors由人產(chǎn)生的靜電可以破壞任何常見的半導(dǎo)體ESDControlPlan靜電控制方案ESDcontrolplanneedstocoverthefollowingquestions:靜電控制方案需要包括以下問題：WhyhaveESDprotectionandcontrol?為什么靜電要保護(hù)和控制？WithoutappropriateESDprotectionandcontrol,thedamageandthelosscouldbesignificantandcostly.Staticelectricitycan’tbeeliminatedbutcanbecontrolled沒有適當(dāng)?shù)撵o電保護(hù)和控制，損害，損失可能代價高昂。靜電不能消除但可以控制WhoshouldparticipateinESDcontroltraining?誰應(yīng)該參與靜電控制訓(xùn)練？PersonnelwhoareinSuppliers,R&D,Purchasing,Warehouse,Producing&Testing,Packaging,CustomerSupport這些人員來自：供應(yīng)商，研發(fā)，采購，倉庫，生產(chǎn)&測試，包裝，客戶支持過程Where

istheESDprotectionareaandESDcontrolarea?哪里是靜電保護(hù)區(qū)和控制區(qū)？PlacesatSuppliers,Labs,IQC,Storage,ProductionLine,AssemblyandTest,PackagingandRepairing這些區(qū)域在供應(yīng)商，實驗室，來料檢驗，儲存，生產(chǎn)線，組裝和測試，包裝和維修What

tocontrol?要控制什么？Environment(floor,humidity,bench,jig,etc.)環(huán)境（地面，濕度，工作臺，夾具，等等）Personnel(clothing,shoes,grounding,etc.)人員（服裝，鞋子，接地，等等）Material(incoming,transporting,packaging,etc.)物料（來料，運輸，包裝，等等）How

todo(whatrulestofollow)?如何做（需要采用什么樣的規(guī)則）AllESDsensitiveitemswillbehandledinESDprotectionarea所有靜電敏感的項目必將在靜電保護(hù)區(qū)內(nèi)處理ThestorageandtransportationofESDsensitivecomponents,circuitboards,assembliesandsystems(bothreparableandserviceable)havetobeinstaticshieldingandnon-chargegeneratingpackagesorcontainers靜電敏感元件，電路板，組件和系統(tǒng)（包括修理和維修）的儲存和運輸必須放置在靜電屏蔽和非電荷產(chǎn)生的包裝或容器ThewholeESDprotectionandcontrolprocessneedtobetestedandmonitored整個靜電保護(hù)和控制過程中需要進(jìn)行檢測和監(jiān)測EnvironmentControl環(huán)境控制TemperatureandHumidity溫度和濕度HighESDriskarea(ductionlineandrepairstation):靜電高危險區(qū)域（如生產(chǎn)線和維修站）：Temperature:20-30oC溫度：20-30攝氏度Humidity(RH):45-75%濕度(相對濕度）：45-75%Otherareas:其它區(qū)域Temperature:20-30oC溫度：20-30攝氏度Humidity(RH):30-75%濕度(相對濕度）：30-75%LocalenvironmentneedtobeadjustedforsomeESDsensitiveitemswithspecialrequirements當(dāng)?shù)丨h(huán)境需要調(diào)整針對有一些特殊要求的靜電敏感材料GroundingWorkstationinParallel工作臺并行接地AllEPAworkstationsshallbecoveredwithESDprotectionpads(staticdissipativepads)所有靜電保護(hù)區(qū)域的工作站應(yīng)覆蓋靜電保護(hù)墊（靜電耗散墊）AllEPAworkstationsshallbegroundedinparalleltoonecommongroundline所有靜電保護(hù)區(qū)域的工作站必須并行接地于一個共同的接地線ESDPolicy靜電防護(hù)政策TestwriststrapsandESDfootweardaily每日測試腕帶和靜電鞋Keepwristbandsnug保持手腕帶舒適并緊繃的OnlytrainedorescortedpeopleareallowedinESDprotectedarea

只有經(jīng)過培訓(xùn)或護(hù)送人員方可允許進(jìn)入靜電防護(hù)區(qū)Keepworkareacleanandclearofinsulators保持工作區(qū)域的清潔和清除絕緣物Handleun-packagedESDsensitiveitemsonlywhengrounded

只有當(dāng)接地處時，才能處理未包裝的靜電敏感產(chǎn)品Visuallycheckallgroundingcordstomakesuretheyareconnected.

目視檢查所有接地線確保其良好的連接。MakesureIonizersaremaintainedandairflowisnotblocked

確保離子發(fā)生器已妥善地維護(hù)和空氣是流通的UseshieldedpackagingforshippingorstoringESDsensitiveitemsoutsidetheESDprotectedarea使用屏蔽用于運輸或儲存的靜電敏感產(chǎn)品在靜電保護(hù)區(qū)外GroundConductors,includingpeople接地導(dǎo)體，包括人NeutralizeinsulatorswithIonizers中和絕緣和離子ShieldESDsensitiveitemswhenstoringortransportingoutsideEPA

在靜電防護(hù)區(qū)外貯存或運輸時，要屏蔽靜電敏感產(chǎn)品。Storage,PackingandHandling

存儲，包裝和處理ESDsensitiveitemsmustalwaysbeputinprotectivepackagingorcontainersbeforemovingfromanESDprotectivearea

當(dāng)靜電敏感物品搬到靜電防護(hù)區(qū)之前，必須放入保護(hù)性包裝或容器ShieldingisnecessarytopreventasensitivedevicefrombeingchargedbyexposuretoESDorbeingtouchedbyachargedobjectduringtransportationorstorage屏蔽是必要的，用于防止敏感器件被暴露的靜電或運輸、存儲過程中接觸到的帶電物體Marking,LabelingandSigns

標(biāo)記，標(biāo)簽和標(biāo)志ESD-protectedareasshallberecognizedbythesignsorplacardsthataredisplayedbeforepersonnelenterthearea.TheseareasshallbemarkedoffwithyellowESDtapeonthefloor靜電保護(hù)區(qū)應(yīng)由顯示的標(biāo)志或標(biāo)牌進(jìn)行識別當(dāng)人員進(jìn)入此區(qū)域.這些地區(qū)應(yīng)當(dāng)標(biāo)上黃色的防靜電膠帶在地板上Marking,LabelingandSigns

標(biāo)記，標(biāo)簽和標(biāo)志ShippingContainerLabel集裝箱標(biāo)簽GroundingPointSign接地點符號Marking,LabelingandSigns

標(biāo)記，標(biāo)簽和標(biāo)志Unitpacklabel部品包裝標(biāo)簽Equipmentlabel設(shè)備標(biāo)簽ESDWristStrapsandFootStraps

防靜電手腕帶，腳帶Cordedwriststraps:

捆扎式手腕帶Cordlesswriststraps:無繩式手腕帶FootStraps:鞋帶ESDshoes:靜電鞋Commonly-seenESDConcerns

常見的ESD關(guān)注事項NowriststrapswhilehandlingchipsorPCBboards沒有帶