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ESD BASICS BASIC CONCEPTS IN ELECTROSTATIC DISCHARGE (ESD) ©Copyright 2003 DESCO INDUSTRIES INC. 3/02

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Esd Basics

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  • ESD BASICS BASIC CONCEPTS IN ELECTROSTATIC DISCHARGE (ESD)Copyright 2003 DESCO INDUSTRIES INC.3/02

  • E S D C o n t r o l T r a i n i n gIntroductionwww.esdsystems.com

  • All Materials TribochargeWhen 2 Surfaces in Contact then Separate Some Atom Electrons Move Causing Imbalance

    One Surface Has Positive Charge & One Surface Has Negative ChargeElectroStatic Charge Generation:www.esdsystems.com

  • Examples Of Electrostatic Discharge or ESDLightning

    Zap from a doorwww.esdsystems.com

  • ESD or ElectroStatic Discharge Charges Seek Balance Discharge is Rapid Creating Heatwww.esdsystems.com

  • Two Types of Materials Conductors Electrical Current Flows Easily So Can be Grounded Can Discharge Examples Metals and Peoplewww.esdsystems.com

  • Two Types of Materials Insulators Electrical Current Does Not Flow Easily Cannot be Grounded Example: Plastics Typically very high chargingwww.esdsystems.com

  • Large ChargesGenerated All The Time Walking across a carpet: 1,500 - 35,000 volts Walking over untreated vinyl floor: 250 - 12,000 volts

    Vinyl envelope used for work instructions: 600 - 7,000 volts

    Worker at a bench: 700 - 6,000 volts

    Unwinding regular tape: 9,000 - 15,000 voltswww.esdsystems.com

  • But To feel a Discharge it must be about 3,000 voltsPeople Discharge Frequentlywww.esdsystems.com

  • ESD That A Person Cant Feel Can Easily Damage Electronic Components 100 volts or less can damage components!www.esdsystems.com

  • Electronic Component ESD Sensitivity (ESDS)

    Human Body Model (HBM)ESD Class 1: Damage you cant feel:

    ESD Class 2:Damage you might feel:

    ESD Class 3:Damage you can probably detect as spark with your own body:200 to 1,999 Volts2,000 to 3,999 Volts4,000 to 15,999 VoltsESD Class 0:Damage you cant feel:0 to 199 Voltswww.esdsystems.com

  • Tiny Conductive Paths Can Easily Be Damaged Integrated Circuit

    Smaller components mean greater sensitivity to ESD. Damage to these components can not be detected by the naked eye. At higher magnification, the pit in the area between the base and emitter becomes more obvious At this magnification we see that 1/2 of the width of the material has been destroyedwww.esdsystems.com

  • Types Of ESDDevice Damage Latent Defect Component wounded But Inspection Passes Catastrophic Failures Inspection Able to detectwww.esdsystems.com

  • Latent DefectsMore Costly Sub Assembly passes inspection Assembly passes inspection Product passes inspection Works a while for customer Then Upsets & Mysterious Problems More Returns More Warranty Costs Lower Customer Satisfaction www.esdsystems.com

  • Like Germs, ESD Is The Hidden Enemy We are aware of sterilization in medicine Control Germs We should develop the same attitude about ESD Control ESDwww.esdsystems.com

  • The Prerequisitesof ESD ControlIdentify ESD AreaIdentify ESD sensitive itemsProvide ESD control trainingwww.esdsystems.com

  • The Basics Of ESD ControlGround Conductors Shield ESDS When store or transport outside EPA

    Neutralize insulators with ionizerswww.esdsystems.com

  • Wrist StrapsGround Conductors Including People Must work, so test wrist strap daily Foot Grounders Must work, so test foot grounder dailywww.esdsystems.com

  • Dissipative WorkSurfaces

    Ground All Conductors in ESD Protected Area Ground ESD worksurface via ground cord to common point ground to equipment ground

    Conductive Floor Mats Ground ESD floor mats via ground cord to equipment groundwww.esdsystems.com

  • Neutralize Insulators Via IonizersIonizer air flow floods area with Ions - Neutralizing Charge Charged Insulators Cannot be groundedwww.esdsystems.com

  • Shield ESD Sensitive Items Outside Protected AreaClosed Metallized Shielding Bag

    Faraday CageCharges Kept on Outside of Package: Covered conductive tote box

    www.esdsystems.com

  • ESD Protected ProductsRegular Versions changed to be Low Charging and/or GroundableESD Smocks and Gloves Remove Insulator or Change to ESD Version Conductive Foam & Shunt Bars Antistatic or Low Charging Tape Dissipative Binders & Document Protectors Dissipative Floor Finishes Conductive & Dissipative Flooringwww.esdsystems.com

  • You Are On The Front Lines Fighting The Hidden Enemy Test Wrist Straps & ESD Footwear daily Keep wrist band snug, foot grounder grounding tab in shoe, & ESD Smocks buttoned up

    Only trained or escorted people allowed in ESD Protected Areawww.esdsystems.com

  • You Are On The Front Lines Fighting The Hidden Enemy Keep work area clean & clear of insulators

    Handle un-packaged ESD sensitive items only when grounded

    Visually check all grounding cords to make sure they are connectedwww.esdsystems.com

  • You Are On The Front Lines Fighting The Hidden Enemy Make sure Ionizers are maintained and air flow is not blocked

    Use shielded packaging for shipping or storing ESD sensitive items outside the ESD Protected Areawww.esdsystems.com

  • The Basics Of ESD ControlGround Conductors including people Shield ESDS when store or transport outside EPA

    Neutralize insulators with ionizers www.esdsystems.com

  • ESD BASICS BASIC CONCEPTS IN ELECTROSTATIC DISCHARGE (ESD)Copyright 2003 DESCO INDUSTRIES INC.

    Better to say Static Charge Generation; zap clip art indicates discharge which is not appropriate.Theses are not examples of Static Electricity; they are examples of Electrostatic Discharge, ESDBottom illustration indicates charge transfer, not a ESD event not a dischargeBottom illustration indicates charge transfer, not a ESD event not a dischargeAlso, Static Charge can be Retained on an isolated conductorArent Upset, Latent, & Catastrophic the 3 Types?Arent Upset, Latent, & Catastrophic the 3 Types?


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