3/02
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ESD Basics презентация
Содержание
- 1. ESD Basics
- 2. E S D C o n
- 3. All Materials Tribocharge When 2 Surfaces in
- 4. Examples Of Electrostatic Discharge or ESD Lightning Zap from a door www.charleswater.co.uk
- 5. ESD or ElectroStatic Discharge Charges
- 6. Two Types of Materials Conductors Electrical
- 7. Electrical Current Does Not Flow Easily
- 8. Large Charges Generated All The Time
- 9. But To feel a Discharge it must
- 10. ESD That A Person Can’t Feel Can
- 11. ESD Class 2: Damage you might feel: Device
- 12. Tiny Conductive Paths Can Easily Be Damaged
- 13. Types Of ESD Device Damage Latent
- 14. Latent Defects More Costly Sub Assembly
- 15. Like Germs, ESD Is The Hidden Enemy
- 16. The Prerequisites of ESD Control Identify ESD
- 17. The Basics Of ESD Control Ground Conductors
- 18. Wrist Straps Ground Conductors Including People
- 19. Ground All Conductors in ESD Protected Area
- 20. Neutralise Insulators Via Ionisers Ioniser air
- 21. Shield ESD Sensitive Items Outside Protected Area
- 22. ESD Protected Products Regular Versions changed to
- 23. You Are On The Front Lines Fighting
- 24. Keep work area clean &
- 25. Make sure Ionisers
- 26. The Basics Of ESD Control Ground Conductors
- 27. ESD BASICS BASIC CONCEPTS IN ELECTROSTATIC DISCHARGE (ESD) ©Copyright 2003 DESCO INDUSTRIES INC.
E S D C o n t r o l T r a i n i n g Introduction www.charleswater.co.uk
Слайд 1ESD BASICS
BASIC CONCEPTS IN
ELECTROSTATIC DISCHARGE (ESD)
©Copyright 2011 DESCO INDUSTRIES
INC.
Слайд 3All 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:
www.charleswater.co.uk
Слайд 5ESD or
ElectroStatic Discharge
Charges Seek Balance
Discharge is Rapid
Creating
Heat
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Слайд 6Two Types of Materials Conductors
Electrical Current Flows Easily
Can be
Grounded
Can Discharge
Examples: Metals and People
Can Discharge
Examples: Metals and People
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Слайд 7 Electrical Current Does Not Flow Easily
Cannot be Grounded
Example:
Plastics
Typically very high charging
Two Types of Materials Insulators
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Слайд 8Large Charges
Generated 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.charleswater.co.uk
Слайд 9But To feel a Discharge it must be about
3,000 volts
People Discharge
Frequently
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Слайд 10ESD That A Person Can’t Feel Can Easily Damage Electronic Comonents
100 volts or less can damage components!
www.charleswater.co.uk
Слайд 11ESD Class 2: Damage you might feel:
Device Names: JFETs, Ics, VHSIC, Precision
resistor networks (type RZ), Hybrids utilizing class 2 parts, Low power bipolar transistors
ESD Class 3A: Damage you can probably
detect as spark with your own body:
Device Names: JFETs, OP AMPS, Ics, VHSIC, All other microcircuits not included in class 1 or class 2, Small signal diodes, General purpose silicon rectifiers, Opto-electronic devices (LEDs, phototransformers, opto couplers), Resistor chips, Piezo electric crystals, Hybrids using Class 3 parts
Electronic Component ESD Sensitivity (ESDS)
Human Body Model (HBM) per ANSI/ESD STM5.1
ESD Class 1: Damage you can’t feel:
Device Names: SAW, JFETS, CCDs, Precision voltage regulator diodes,
OP AMP, Thin film resistors, Integrated circuits, Hybrids utilizing class 1 parts, VHSI, CSCRs
250 to 1,999 Volts
2,000 to 3,999 Volts
4,000 to 7,999 Volts
ESD Class 0: Damage you can’t feel:
Device Names: SAW, JFETS, CCDs, Precision voltage regulator diodes,
OP AMP, Thin film resistors, Integrated circuits, Hybrids utilizing class 1 parts, VHSI, CSCRs
< 250 Volts
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Слайд 12Tiny Conductive Paths Can Easily Be Damaged
Smaller 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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Слайд 13Types Of ESD
Device Damage
Latent Defect
Component wounded
But Inspection Passes
Catastrophic Failures
Inspection
Able to detect
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Слайд 14Latent Defects
More 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
Works a while for customer
Then Upsets & Mysterious Problems
More Returns
More Warranty Costs
Lower Customer Satisfaction
www.charleswater.co.uk
Слайд 15Like 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
www.charleswater.co.uk
Слайд 16The Prerequisites
of ESD Control
Identify ESD Area
Identify ESD sensitive items
Provide ESD
control
training
www.charleswater.co.uk
Слайд 17The Basics Of ESD Control
Ground Conductors
Neutralise
insulators
with
ionisers
www.charleswater.co.uk
Shield ESDS
When store
or transport
outside EPA
Слайд 18Wrist Straps
Ground Conductors
Including People
Must work, so
test wrist
strap daily
Foot Grounders
Must work, so
test foot grounder daily
www.charleswater.co.uk
Слайд 19Ground 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
www.charleswater.co.uk
Слайд 20Neutralise Insulators
Via Ionisers
Ioniser air flow floods area with Ions
-
Neutralising Charge
Charged Insulators Cannot be grounded
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Слайд 21Shield ESD Sensitive Items Outside Protected Area
Faraday Cage
Closed Metallised Shielding Bag
Charges
Kept on Outside of Package:
Covered conductive tote box
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Слайд 22ESD Protected Products
Regular 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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Слайд 23You 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
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.charleswater.co.uk
Слайд 24 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
Visually check all grounding cords to make sure they are connected
You Are On The Front Lines Fighting The Hidden Enemy
www.charleswater.co.uk
Слайд 25 Make sure Ionisers are maintained and air
flow is not blocked
Use shielded packaging for shipping or storing ESD sensitive items outside the ESD Protected Area
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
www.charleswater.co.uk
Слайд 26The Basics Of ESD Control
Ground Conductors including people
Shield ESDS when
store
or transport outside EPA
Neutralise insulators
with ionisers
www.charleswater.co.uk
Слайд 27ESD BASICS
BASIC CONCEPTS IN
ELECTROSTATIC DISCHARGE (ESD)
©Copyright 2003 DESCO INDUSTRIES
INC.
