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ESD  BASICS      BASIC CONCEPTS INELECTROSTATIC DISCHARGE (ESD)              ©Copyright 2003 DESCO INDUSTRIES INC.   3/02
IntroductionESD   Control Training                 www.esdsystems.com
All Materials TribochargeElectroStatic Charge Generation:• When 2 Surfaces in  Contact then Separate• Some Atom Electrons ...
Examples Of ElectrostaticDischarge or ESD     • Lightning                   • Zap from a door                            w...
ESD orElectroStatic Discharge • Charges Seek Balance • Discharge is Rapid • Creating Heat                          www.esd...
Two Types ofMaterials Conductors • Electrical Current Flows Easily • So Can be Grounded • Can Discharge • Examples Metals ...
Two Types ofMaterials Insulators• Electrical Current Does Not Flow Easily• Cannot be Grounded• Example: Plastics Typically...
Large ChargesGenerated All The Time• Walking across a carpet:   1,500 - 35,000 volts• Walking over untreated vinyl floor: ...
People DischargeFrequently But To feel a  Discharge it    must be  about  3,000 volts                   www.esdsystems.com
ESD That A Person Can’t FeelCan Easily Damage ElectronicComponents  100 volts or   less can   damage components!          ...
Electronic Component ESDSensitivity (ESDS)Human Body Model (HBM)•   ESD Class 0: Damage you can’t feel:      0 to 199 Volt...
Tiny Conductive Paths CanEasily Be DamagedSmaller components mean greater sensitivity to ESD. Damage to these components c...
Types Of ESDDevice Damage• Latent Defect Component wounded But Inspection Passes• Catastrophic Failures  Inspection  Able ...
Latent DefectsMore Costly • Sub Assembly passes inspection • Assembly passes inspection • Product passes inspection • Work...
Like Germs, ESD Is TheHidden Enemy Control Germs                 Control ESD    We are aware of                           ...
The Prerequisitesof ESD Control• Identify ESD Area• Identify ESD sensitive items• Provide ESD  control training           ...
The Basics Of ESD Control  • Ground Conductors  • Shield ESDS    When store    or transport    outside EPA  • Neutralize  ...
Ground ConductorsIncluding People • Wrist Straps • Must work, so   test wrist strap daily • Foot Grounders • Must work, so...
Ground All Conductors inESD Protected Area                                • Dissipative WorkSurfaces                      ...
Neutralize InsulatorsVia Ionizers• Charged Insulators Cannot be grounded• Ionizer air flow floods area with Ions  - Neutra...
Shield ESD Sensitive ItemsOutside Protected Area                Charges Kept on Outside                of Package: Faraday...
ESD Protected ProductsRegular Versions changed to beLow Charging and/or GroundableRemove Insulator or Change to ESD Versio...
You Are On The Front LinesFighting The Hidden Enemy • Test Wrist Straps & ESD   Footwear daily • Keep wrist band snug,   f...
You Are On The Front LinesFighting The Hidden Enemy• Keep work area clean &  clear of insulators• Handle un-packaged ESD  ...
You Are On The Front LinesFighting The Hidden Enemy• Make sure Ionizers  are maintained and air  flow is not blocked• Use ...
The Basics Of ESD Control• Ground Conductors including  people• Neutralize insulators  with ionizers• Shield ESDS when sto...
ESD  BASICS      BASIC CONCEPTS INELECTROSTATIC DISCHARGE (ESD)              ©Copyright 2003 DESCO INDUSTRIES INC.
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Esd basics

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Esd basics

  1. 1. ESD BASICS BASIC CONCEPTS INELECTROSTATIC DISCHARGE (ESD) ©Copyright 2003 DESCO INDUSTRIES INC. 3/02
  2. 2. IntroductionESD Control Training www.esdsystems.com
  3. 3. All Materials TribochargeElectroStatic Charge Generation:• When 2 Surfaces in Contact then Separate• Some Atom Electrons Move Causing Imbalance One S urface Has Positive Charge & One S urface Has Negative Charge www.esdsystems.com
  4. 4. Examples Of ElectrostaticDischarge or ESD • Lightning • Zap from a door www.esdsystems.com
  5. 5. ESD orElectroStatic Discharge • Charges Seek Balance • Discharge is Rapid • Creating Heat www.esdsystems.com
  6. 6. Two Types ofMaterials Conductors • Electrical Current Flows Easily • So Can be Grounded • Can Discharge • Examples Metals and People www.esdsystems.com
  7. 7. Two Types ofMaterials Insulators• Electrical Current Does Not Flow Easily• Cannot be Grounded• Example: Plastics Typically very high charging www.esdsystems.com
  8. 8. 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 volts www.esdsystems.com
  9. 9. People DischargeFrequently But To feel a Discharge it must be about 3,000 volts www.esdsystems.com
  10. 10. ESD That A Person Can’t FeelCan Easily Damage ElectronicComponents 100 volts or less can damage components! www.esdsystems.com
  11. 11. Electronic Component ESDSensitivity (ESDS)Human Body Model (HBM)• ESD Class 0: Damage you can’t feel: 0 to 199 Volts• ESD Class 1: Damage you can’t feel: 200 to 1,999 Volts• ESD Class 2: Damage you might feel: 2,000 to 3,999 Volts• ESD Class 3: Damage you can probably detect as spark with your 4,000 to 15,999 Volts own body: www.esdsystems.com
  12. 12. Tiny Conductive Paths CanEasily Be DamagedSmaller components mean greater sensitivity to ESD. Damage to these components can not be detected by the naked eye.• At this • At higher magnification magnification, we see that the pit in the 1/2 of the area between width of the the base and material emitter becomes has been more obvious destroyed • Integrated Circuit www.esdsystems.com
  13. 13. Types Of ESDDevice Damage• Latent Defect Component wounded But Inspection Passes• Catastrophic Failures Inspection Able to detect www.esdsystems.com
  14. 14. 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
  15. 15. Like Germs, ESD Is TheHidden Enemy Control Germs Control ESD We are aware of We should develop thesterilization in medicine same attitude about ESD www.esdsystems.com
  16. 16. The Prerequisitesof ESD Control• Identify ESD Area• Identify ESD sensitive items• Provide ESD control training www.esdsystems.com
  17. 17. The Basics Of ESD Control • Ground Conductors • Shield ESDS When store or transport outside EPA • Neutralize insulators with ionizers www.esdsystems.com
  18. 18. Ground ConductorsIncluding People • Wrist Straps • Must work, so test wrist strap daily • Foot Grounders • Must work, so test foot grounder daily www.esdsystems.com
  19. 19. Ground All Conductors inESD Protected Area • Dissipative WorkSurfaces – 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 ground www.esdsystems.com
  20. 20. Neutralize InsulatorsVia Ionizers• Charged Insulators Cannot be grounded• Ionizer air flow floods area with Ions - Neutralizing Charge www.esdsystems.com
  21. 21. Shield ESD Sensitive ItemsOutside Protected Area Charges Kept on Outside of Package: Faraday Cage • Closed Metallized Shielding Bag • Covered conductive tote box www.esdsystems.com
  22. 22. ESD Protected ProductsRegular Versions changed to beLow Charging and/or GroundableRemove Insulator or Change to ESD Version • ESD Smocks and Gloves • Conductive Foam & Shunt Bars • Antistatic or Low Charging Tape • Dissipative Binders & Document Protectors • Dissipative Floor Finishes • Conductive & Dissipative Flooring www.esdsystems.com
  23. 23. You Are On The Front LinesFighting 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 Area www.esdsystems.com
  24. 24. You Are On The Front LinesFighting 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 connected www.esdsystems.com
  25. 25. You Are On The Front LinesFighting 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 Area www.esdsystems.com
  26. 26. The Basics Of ESD Control• Ground Conductors including people• Neutralize insulators with ionizers• Shield ESDS when store or transport outside EPA www.esdsystems.com
  27. 27. ESD BASICS BASIC CONCEPTS INELECTROSTATIC DISCHARGE (ESD) ©Copyright 2003 DESCO INDUSTRIES INC.

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