ESD Class 0 Protection Stress Levels

Июль 22, 2022

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ESD Class 0 Protection Stress Levels

Содержание

2. ESD Event Classification From EMI to EOS - Speed Classification EMI caused ESD has short and
3. * NASA Workmanship Standards Introduction 1What is an ESD Sensitivity Level? 2How is it obtained? 3Why
4. * NASA Workmanship Standards Overview ESD Models Provide a way to characterize the sensitivity of components
5. * NASA Workmanship Standards Purpose of ESD Models Models establish Benchmarks for ESD Sensitivity. Different Models
6. * NASA Workmanship Standards Human Body (HBM): discharging event through the body and the part to
7. ESD Damage to Die Structure Damage types can vary depending on event models. Long, higher Voltage
8. ESD Sensitivity Levels * NASA Workmanship Standards
9. * NASA Workmanship Standards White Paper 2: A Case for Lowering Component Level CDM ESD Specifications
10. * NASA Workmanship Standards Models Comparisons Courtesy of ESDA
11. ESD Models vs. Sources of Threats * NASA Workmanship Standards
12. “Class 0” Parts Protection “Class 0” has become the generic term to define parts which are
13. Model Implementation NASA-HDBK-8739.21 (in Approval Cycle) Guide for Creating an ANSI/ESD S20.20 Implementation Plan Focus is
14. Model Implementation Recent failures of high speed devices (LVDS, FPGAs) drive users to Class 0 HBM…
15. Class 0 & CDM Class 0 refers to the HBM model Currently most ESD damage is
16. Limits of Design-in Protection CDM protection by the design is driven by the peak current from
17. Protection of Devices Sensitive to Class 0 ESD “Shalls” related to HBM Class 0 protection: Dissipative
18. External ESD Control Measures for Extremely Sensitive Devices * NASA Workmanship Standards
19. Charged Board Events CBE are caused when a board is pulled from the bag and place
20. * NASA Workmanship Standards Where to Get More Information WEB searches under “ESD Models” ESDA publications
21. * NASA Workmanship Standards References ANSI/ESD STM5.1-2001 ESD Sensitivity Testing (HBM) ANSI/ESD STM5.2-1999 ESD Sensitivity Testing
22. Thank you Any Questions? * NASA Workmanship Standards
23. * NASA Workmanship Standards Typical HBM Generated Failures 2000X 100X Courtesy of JPL Scott M. Hull
24. * NASA Workmanship Standards Typical MM ESD Stress Failure Scott M. Hull NASA/GSFC
25. * NASA Workmanship Standards Typical CDM generated failures 4600x 8600x Courtesy of JPL Courtesy of JPL
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ESD Event Classification
From EMI to EOS - Speed Classification
EMI caused ESD

has short and repetitive pulses with low energy.
EOS is and ESD event with unlimited Current/Time constrains
HBM, MM & CDM model typical events in the manufacturing areas.

NASA Workmanship Standards

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*
NASA Workmanship Standards
Introduction
1What is an ESD Sensitivity Level?
2How is it

obtained?
3Why is it important to the user?
4Why different test models?

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*
NASA Workmanship Standards
Overview
ESD Models Provide a way to characterize the

sensitivity of components to ESD
The different ESD models simulate the different environments experienced by electronic components during the manufacturing process.
Parts and assemblies may be exposed to more than one type of ESD event over the manufacturing and test life cycle.

CDM

HBM

ESD Models:
(differences & interrelation)

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*
NASA Workmanship Standards
Purpose of ESD Models
Models establish Benchmarks for ESD

Sensitivity.
Different Models are used to simulate different work environments.
Models provide help to prevent and analyze ESD Failures

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*
NASA Workmanship Standards
Human Body (HBM): discharging event through the body

and the part to ground.
Machine (MM): discharge voltage through automated handling equipment or hand-tools and the part to ground.
Charged Device (CDM): discharge into or out of a part due to charge accumulation within the part itself.

ESD Event Test Models

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ESD Damage to Die Structure
Damage types can vary depending on event

models.
Long, higher Voltage HBM event can look like electrical overstress at die periphery.
Fast, high Current CDM event causes defects in core area which can be latent failures.
Must use advanced FA techniques to locate sites.
A Comparison of Electrostatic Discharge Models and Failure Signatures for CMOS Integrated Circuit Devices, M. Kelly, G. Servais, T. Diep, S. Twerefour, D. Lin, G. Shah, EOS/ESD Symposium 95

NASA Workmanship Standards

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ESD Sensitivity Levels
*
NASA Workmanship Standards

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*
NASA Workmanship Standards
White Paper 2: A Case for Lowering Component Level

CDM ESD Specifications and Requirements, Industry Council on ESD Target Levels, March 2009

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*
NASA Workmanship Standards
Models Comparisons
Courtesy of ESDA

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ESD Models vs. Sources of Threats
*
NASA Workmanship Standards

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“Class 0” Parts Protection
“Class 0” has become the generic term to

define parts which are very sensitive to ESD.
It now encompass parts sensitive to HBM <250v as well as parts damaged by EMI
Sensitivity for these parts needs to be also defined using CDM classifications.
{EPAs as currently implemented at GSFC can protect parts sensitive to ~100 V HBM}

NASA Workmanship Standards

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Model Implementation
NASA-HDBK-8739.21 (in Approval Cycle) Guide for Creating an ANSI/ESD

S20.20 Implementation Plan
Focus is on HBM: emphasis on operator grounding, dissipative surfaces, reduction of triboelectric charging
For HBM & MM the methods for protective practices and creating protective spaces are highly reproducible and “low tech”
Proper implementation requires training and follow-up
HBM safety methods have brought HBM & MM failures down (now are ~10% of failures encountered industry-wide)

NASA Workmanship Standards

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Model Implementation
Recent failures of high speed devices (LVDS, FPGAs) drive users

to Class 0 HBM…
…But IC manufacturers calculate that about 90% of the failures from the field are due to CDM ESD events.
CDM-related field returns are associated with low, medium, and high sensitivity devices.
Safety methods for CDM are highly customized because the model is less mature (many unknown variables and variable relationships, rapidly changing characteristics

NASA Workmanship Standards

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Class 0 & CDM
Class 0 refers to the HBM model
Currently most

ESD damage is caused by much shorter pulses best defined in the CDM model.
ESD pulses can be clamped by internal shunts and bypasses at the expense of design complexity and speed.
There is a limit beyond which the device cannot be internally protected.

NASA Workmanship Standards

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Limits of Design-in Protection
CDM protection by the design is driven by

the peak current from the IC package discharge at the CDM voltage targeted.
The larger the package the higher the peak current of the CDM pulse created.
The smaller the geometry of the circuit the lower the breakdown voltage of the circuit
Present Theoretical Limit ≈ 125v CDM

NASA Workmanship Standards

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Protection of Devices Sensitive to Class 0 ESD
“Shalls” related to

HBM Class 0 protection:
Dissipative chairs and stools
Conductive or dissipative floors or floor mats
Relative humidity
Ionizers
Smocks
Procedures for Mating and de-mating of harnesses
Soldering iron testing
Signage

NASA Workmanship Standards

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External ESD Control Measures for Extremely Sensitive Devices
*
NASA Workmanship Standards

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Charged Board Events
CBE are caused when a board is pulled from

the bag and place on a conductive surface
This ESD hazard was often overlooked
During FA the components failure is usually classified as EOS damage.
Recent data reported by several Companies indicates that CBEs are commonly missed in FA

NASA Workmanship Standards

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*
NASA Workmanship Standards
Where to Get More Information
WEB searches under “ESD Models”
ESDA

publications
Consulting services provide Advice on tough ESD problems and Solutions.

Слайд 21

*
NASA Workmanship Standards
References
ANSI/ESD STM5.1-2001 ESD Sensitivity Testing (HBM)
ANSI/ESD STM5.2-1999 ESD Sensitivity

Testing (MM)
ANSI/ESD STM5.3.1-1999 ESD Sensitivity Testing (CDM)
ANSI/ESD SP5.2.2-2004 ESD Sensitivity Testing (SDM)
ANSI/ESD SP5.5.1-2004 ESD Sensitivity Testing (TPL)
Scott M. Hull, “ESD Failures in Thin-Film Resistors” NASA/Goddard Space Flight Center
http://esdsystems.com/whitepapers/
http://www.semiconfareast.com
http://www.ce-mag.com/archive/01/09/henry.html
http://www.ce-mag.com/ce-mag.com/archive/01/03/0103CE_046.html
White Paper: Industry Council on ESD Target Levels on CDM
http://ossma-dev.gsfc.nasa.gov/ESDResources/index.php
https://ossmacm.gsfc.nasa.gov/

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Thank you Any Questions?
*
NASA Workmanship Standards

Слайд 23

*
NASA Workmanship Standards
Typical HBM Generated Failures
2000X
100X
Courtesy of JPL
Scott M. Hull NASA/GSFC

Слайд 24

*
NASA Workmanship Standards
Typical MM ESD Stress Failure
Scott M. Hull NASA/GSFC

Слайд 25

ESD Class 0 Protection Stress Levels

Содержание

ESD Event ClassificationFrom EMI to EOS - Speed ClassificationEMI caused ESD

*NASA Workmanship StandardsIntroduction 1What is an ESD Sensitivity Level?2How is it

*NASA Workmanship StandardsOverview ESD Models Provide a way to characterize the

*NASA Workmanship StandardsPurpose of ESD Models Models establish Benchmarks for ESD

*NASA Workmanship Standards Human Body (HBM): discharging event through the body

ESD Damage to Die StructureDamage types can vary depending on event

ESD Sensitivity Levels*NASA Workmanship Standards

*NASA Workmanship StandardsWhite Paper 2: A Case for Lowering Component Level

*NASA Workmanship StandardsModels ComparisonsCourtesy of ESDA

ESD Models vs. Sources of Threats*NASA Workmanship Standards

“Class 0” Parts Protection“Class 0” has become the generic term to

Model Implementation NASA-HDBK-8739.21 (in Approval Cycle) Guide for Creating an ANSI/ESD

Model ImplementationRecent failures of high speed devices (LVDS, FPGAs) drive users

Class 0 & CDMClass 0 refers to the HBM modelCurrently most

Limits of Design-in ProtectionCDM protection by the design is driven by

Protection of Devices Sensitive to Class 0 ESD “Shalls” related to

External ESD Control Measures for Extremely Sensitive Devices *NASA Workmanship Standards

Charged Board EventsCBE are caused when a board is pulled from

*NASA Workmanship StandardsWhere to Get More InformationWEB searches under “ESD Models”ESDA

*NASA Workmanship StandardsReferencesANSI/ESD STM5.1-2001 ESD Sensitivity Testing (HBM)ANSI/ESD STM5.2-1999 ESD Sensitivity

Thank you Any Questions?*NASA Workmanship Standards

*NASA Workmanship StandardsTypical HBM Generated Failures2000X100XCourtesy of JPLScott M. Hull NASA/GSFC

*NASA Workmanship StandardsTypical MM ESD Stress FailureScott M. Hull NASA/GSFC

*NASA Workmanship StandardsTypical CDM generated failures 4600x8600xCourtesy of JPLCourtesy of JPL

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ESD Event Classification
From EMI to EOS - Speed Classification
EMI caused ESD

*
NASA Workmanship Standards
Introduction
1What is an ESD Sensitivity Level?
2How is it

*
NASA Workmanship Standards
Overview
ESD Models Provide a way to characterize the

*
NASA Workmanship Standards
Purpose of ESD Models
Models establish Benchmarks for ESD

*
NASA Workmanship Standards
Human Body (HBM): discharging event through the body

ESD Damage to Die Structure
Damage types can vary depending on event

ESD Sensitivity Levels
*
NASA Workmanship Standards

*
NASA Workmanship Standards
White Paper 2: A Case for Lowering Component Level

*
NASA Workmanship Standards
Models Comparisons
Courtesy of ESDA

ESD Models vs. Sources of Threats
*
NASA Workmanship Standards

“Class 0” Parts Protection
“Class 0” has become the generic term to

Model Implementation
NASA-HDBK-8739.21 (in Approval Cycle) Guide for Creating an ANSI/ESD

Model Implementation
Recent failures of high speed devices (LVDS, FPGAs) drive users

Class 0 & CDM
Class 0 refers to the HBM model
Currently most

Limits of Design-in Protection
CDM protection by the design is driven by

Protection of Devices Sensitive to Class 0 ESD
“Shalls” related to

External ESD Control Measures for Extremely Sensitive Devices
*
NASA Workmanship Standards

Charged Board Events
CBE are caused when a board is pulled from

*
NASA Workmanship Standards
Where to Get More Information
WEB searches under “ESD Models”
ESDA

*
NASA Workmanship Standards
References
ANSI/ESD STM5.1-2001 ESD Sensitivity Testing (HBM)
ANSI/ESD STM5.2-1999 ESD Sensitivity

Thank you Any Questions?
*
NASA Workmanship Standards

*
NASA Workmanship Standards
Typical HBM Generated Failures
2000X
100X
Courtesy of JPL
Scott M. Hull NASA/GSFC

*
NASA Workmanship Standards
Typical MM ESD Stress Failure
Scott M. Hull NASA/GSFC

*
NASA Workmanship Standards
Typical CDM generated failures
4600x
8600x
Courtesy of JPL
Courtesy of JPL