abhay presentation
TRANSCRIPT
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ESD
Abhay Singh 3/02
•Name: Abhay Singh
•Dept.: Quality
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ESD ELECTROSTATIC DISCHARGE (ESD)
Abhay Singh 3/02
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E S D C o n t r o l
Introduction
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All Materials Tribocharge
• When 2 Surfaces in Contact then Separate
• Some Atom Electrons Move Causing Imbalance
One Surface Has Positive Charge & One Surface Has Negative Charge
ElectroStatic Charge Generation:
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Examples Of Electrostatic Discharge or ESD
• Lightning• Zap from a door
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ESD or ElectroStatic Discharge
• Charges Seek Balance• Discharge is Rapid• Creating Heat
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Two Types of Materials Conductors
• Electrical Current Flows Easily• So Can be Grounded• Can Discharge• Examples Metals and People
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• Electrical Current Does Not Flow Easily• Cannot be Grounded• Example: Plastics Typically very high charging
Two Types of Materials Two Types of Materials InsulatorsInsulators
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Large ChargesGenerated All The Time• Walking across a carpet:
1,500 - 35,000 volts1,500 - 35,000 volts• Walking over untreated vinyl floor: 250 - 12,000 volts250 - 12,000 volts• Vinyl envelope used for work
instructions: 600 - 7,000 volts600 - 7,000 volts• Worker at a bench:
700 - 6,000 volts700 - 6,000 volts • Unwinding regular tape: 9,000 - 15,000 volts9,000 - 15,000 volts
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But To feel a Discharge it must be about 3,000 volts
People Discharge Frequently
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ESD That A Person Can’t Feel Can ESD That A Person Can’t Feel Can Easily Damage Electronic Easily Damage Electronic ComponentsComponents
100 volts or less can damage
components!
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Electronic Component ESD Sensitivity (ESDS)
Human Body Model (HBM)
• ESD Class 1: Damage you can’t 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 Volts
2,000 to 3,999 Volts
4,000 to 15,999 Volts
• ESD Class 0: Damage you can’t feel: 0 to 199 Volts
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Tiny Conductive Paths Can Easily Be DamagedSmaller components mean greater sensitivity to ESD. Damage
to these components can not be detected by the naked eye.
• Integrated Circuit
• 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 destroyed
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Types Of ESDDevice Damage• Latent Defect
Component woundedBut Inspection Passes
• Catastrophic FailuresInspection Able to detect
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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
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Like Germs, ESD Is The Hidden Enemy
Control Germs
We are aware of sterilization in medicine We should develop the
same attitude about ESD
Control ESD
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The Prerequisitesof ESD Control
• Identify ESD Area• Identify ESD sensitive items• Provide ESD
control training
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The Basics Of ESD Control
• Ground Conductors
• Shield ESDS When store or transport outside EPA
• Neutralize insulators with ionizers
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• Wrist Straps
Ground ConductorsIncluding People
• Must work, so test wrist strap daily
• Foot Grounders
• Must work, so test foot grounder daily
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Ground All Conductors in ESD 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
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Neutralize Insulators Via Ionizers
• Ionizer air flow floods area with Ions - Neutralizing Charge
• Charged Insulators Cannot be grounded
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Shield ESD Sensitive Items Outside Protected Area
Faraday Cage• Closed Metallized Shielding Bag
Charges Kept on Outside of Package:
• Covered conductive tote box
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ESD Protected ProductsRegular Versions changed to be Low Charging and/or Groundable
• ESD 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 Flooring
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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 Area
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• 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
You Are On The Front Lines Fighting The Hidden Enemy
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• 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
You Are On The Front Lines Fighting The Hidden Enemy
Abhay Singh
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The Basics Of ESD Control
• Ground Conductors including people
• Shield ESDS when store or transport outside EPA
• Neutralize insulators with ionizers
Abhay Singh
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ESD TRAINING
ELECTROSTATIC DISCHARGE (ESD)
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ESD TRAINING
ELECTROSTATIC DISCHARGE (ESD)
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•Thank You!