(SMT)ESD介绍(英文)课件.pptx
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- SMT ESD 介绍 英文 课件
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1、ESDdocin/sundae_mengESD Presentation OutlinePart 1:Introduction/Background Part 2:Electrostatic Problems Part 3:ResistancePart 4:IonizationPart 5:Charge Measurementdocin/sundae_mengCharging MechanismsTriboelectric ChargingInduction Chargingdocin/sundae_mengTriboelectrification+-+-MATERIAL CONTACTdoc
2、in/sundae_mengTriboelectrification+-+-MATERIAL SEPARATION-docin/sundae_mengTriboelectric ChargingThe amount of charge transferred depends onTypes of materials involved Area of contactNumber of contacts Rate of separationSurrounding environmentdocin/sundae_mengTriboelectric ChargingGlass Human Hair N
3、ylonWool Aluminum Paper Cotton Steel RubberNickel,Copper Brass,SilverPolyester Polyurethane Polyethylene Polypropylene PVCSilicon Teflon_+Triboelectric Seriesdocin/sundae_mengTypical Charge LevelsTypical charge(voltage)measured for different activitiesWalking on an untreated vinyl floor12 kV for 10%
4、RH3 kV for 55%RHWorker standing up6 kV for 10%RH400 V for 55%RHdocin/sundae_mengTypical Charge LevelsTypical charge(voltage)measured on common objectsWafers5 kVWafer Carriers35 kV Quartz Ware15 kVPlastic Film40 kVSmocks10 kVdocin/sundae_mengInduction Charging-+-+docin/sundae_mengCharge by Induction_
5、 _ _ _+_+docin/sundae_mengProblemsElectrostatic AttractionContamination“Static Cling”ESDDevice Damage Equipment Latch Up(ESC)docin/sundae_mengProblemsElectrostatic AttractionContamination“Static Cling”docin/sundae_mengProblemsElectrostatic AttractionContamination“Static Cling”docin/sundae_mengProble
6、msESDDevice DamageEquipment Latch Updocin/sundae_mengProblemsESDDevice DamageEquipment Latch UpOften misdiagnosed as software bugs.Induced EM DisturbanceAn Extra Pulsedocin/sundae_mengDischarge ModelsTribocharging or induction charging+metal contact=ESDHuman Body Model(HBM)Machine Model(MM)Charged D
7、evice Model(CDM)are used to simulate ESD events from various sourcesdocin/sundae_meng1500 ohmsHuman Body Model100k ohmsHVPower Supply100 pFDUTdocin/sundae_mengMachine ModelZero ohms andlow L100k ohmsHVPower Supply200 pFDUTdocin/sundae_mengCharged Device ModelHVPower SupplyCharge Platedocin/sundae_me
8、ngCharged Device ModelHVPower SupplyCharge Platedocin/sundae_mengGrounding(first line of defense)Grounding prevents charging.Ground everything-floors,mats,personnel,chairs,garments,machine parts.docin/sundae_mengSoft Grounds Use soft grounds to control discharges.Using dissipative materials limits d
9、ischarge current to a level that does not cause damage.docin/sundae_mengResistance MapInsulative1031041051061071081091013 1014 10151010 1011 1012Surface Resistance(Ohms)101102DissipativeConductiveShieldingdocin/sundae_mengThe Need for StandardsMany common items are rendered dissipative to control di
10、scharges.ESD control programs require qualification of these items.Thus a need for standardized test methods.Flooring Work Surfaces ChairsGloves Garments Packagingdocin/sundae_mengESD Association StandardsGarments WorksurfacesFlooring ChairsPlanar Materials10V100V103104105106107108109101310101011 10
11、12Surface Resistance(ohms)docin/sundae_mengTEST VOLTAGEINPUTSHIELD/GROUNDVIPoint-To-Point MeasurementsFacility GroundRegulated Test Voltagedocin/sundae_mengINPUTITEST VOLTAGEVSHIELD/GROUNDRTG MeasurementsFacility Grounddocin/sundae_mengMeasuring Small Objects5 lb probes are tool large to measure man
12、y objects of interest.ThermoformedTrays ClamshellsTape and Reel CarriersPick and Place Suction Cupsdocin/sundae_mengIonizationInsulators cannot be grounded.Methods of Ion Generation Ionization by Radiation Electrical(Corona)Ionizationdocin/sundae_mengIonization by RadiationRadioactive Decay Alpha pa
13、rticlesElectromagnetic Radiation Soft X-RayUltravioletInherently balanceddocin/sundae_mengCorona Ionization+_HIGH VOLTAGE(+)docin/sundae_mengCorona IonizationHIGH VOLTAGE(+)+docin/sundae_mengCorona IonizationTypes of Electrical IonizersAC DCPulse DCdocin/sundae_mengAC and Pulse DC Ionization+_HIGH V
14、OLTAGE(AC)docin/sundae_mengAC IonizationStep up line voltageLow costHigh airflow required to prevent recombination No control of balancedocin/sundae_mengPulsed DC IonizationFast transport of ions without air flowMinimum recombination Good for room ionizationdocin/sundae_mengDC IonizationAir ions wil
15、l recombine and drift in the electric field.+_HIGH VOLTAGE(+)HIGH VOLTAGE(-)docin/sundae_mengEfficiency and Balance_+HIGH VOLTAGE(+)HIGH VOLTAGE(-)docin/sundae_mengTesting IonizersSuitability for ApplicationIncoming Test Periodic Verificationdocin/sundae_mengHow We Test IonizersTest efficiency of io
16、n generation.How quickly will the ionizer discharge a charged surface.Test the balance of positive and negative air ions.An imbalance will charge an uncharged surface.docin/sundae_mengHow We Test IonizersThe instrument used to test ionizers is the Charged-Plate Monitor.docin/sundae_mengDischarge(Dec
17、ay)TestsEvaluate the quantity of ions produced by the ionizer.Charge a surface and measure the time to neutralize the charge.Perform for positive and negative charges.docin/sundae_mengFloat(Balance)TestEvaluate the balance of positive and negative ions produced by the ionizer.docin/sundae_mengCharge
18、d-Plate Monitors(CPMs)Conventional Constructiondocin/sundae_mengProperties of Charged,Isolated Conductors_GROUNDQ=CVCharges are mobile.They are free to redistribute themselves on the surface of the objectCharge(Q)is fixed.Capacitance and voltage depend on the location of the charged(conductive)objec
19、t.Cdocin/sundae_mengProperties of Charged Insulators_GROUNDQ X X=CVCharges are not mobile.They cannot redistribute themselves on the surface of the object.Charges on an insulator cannot be removed by connecting the surface of the insulator to ground.Charged insulators are more troublesome to charact
20、erize.Strictly speaking,the behavior of charged insulators cannot be characterized by Q=CV.X XCdocin/sundae_mengDirect Measurement of ChargeGROUNDDischarge isolated conductive objects into a coulombmeter.Destructive test.Cant test insulators this way.C_+_Q=CVdocin/sundae_mengDirect Measurement of Ch
21、argeOther objects(charged insulators)must be placed in a Faraday enclosure that is connected to a coulombmeter.+_docin/sundae_mengDirect Measurement of ChargeIt is challenging to place object into a Faraday enclosure without adding or subtracting charge.Measuring charge using these direct methods ma
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