ANSI ESD-S20.20-2021-EN.pdf - 第9页

ESD Association Standard ANSI/ESD S20. 20- 2021 1 ESD Association St andard fo r the Development of an Electrostatic Dis charge Control Program for Protection of E lectrical and Electro nic Par ts, Assemblies , and Equip…

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ANSI/ESD S20.20-2021
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TABLE OF CONTENTS
1.0 PURPOSE ............................................................................................................................... 1
2.0 SCOPE .................................................................................................................................... 1
3.0 REFERENCED PUBLICATIONS ............................................................................................ 1
4.0 DEFINITIONS .......................................................................................................................... 2
5.0 PERSONNEL SAFETY ........................................................................................................... 2
6.0 ESD CONTROL PROGRAM ................................................................................................... 2
6.1 ESD CONTROL PROGRAM REQUIREMENTS ............................................................................ 2
6.2 ESD CONTROL PROGRAM MANAGER OR COORDINATOR ........................................................ 3
6.3 TAILORING ............................................................................................................................ 3
7.0 ESD CONTROL PROGRAM ADMINISTRATIVE REQUIREMENTS..................................... 3
7.1 ESD CONTROL PROGRAM PLAN ............................................................................................ 3
7.2 TRAINING PLAN ..................................................................................................................... 3
7.3 PRODUCT QUALIFICATION PLAN ............................................................................................. 3
7.4 COMPLIANCE VERIFICATION PLAN .......................................................................................... 4
8.0 ESD CONTROL PROGRAM PLAN TECHNICAL REQUIREMENTS.................................... 4
8.1 GROUNDING/EQUIPOTENTIAL BONDING SYSTEMS ................................................................... 4
8.2 PERSONNEL GROUNDING ...................................................................................................... 5
8.3 ESD PROTECTED AREAS (EPAS) .......................................................................................... 6
8.3.1 Insulators ...................................................................................................................... 6
8.3.2 Isolated Conductors ..................................................................................................... 7
8.4 PACKAGING ........................................................................................................................ 10
8.4.1 United States Department of Defense (DoD) Packaging Requirements ................... 10
8.5 MARKING ............................................................................................................................ 10
Annexes
Annex A (Informative): Additional Process Considerations .......................................................... 11
Annex B (Informative): ESD Sensitivity Testing ........................................................................... 12
Annex C (Informative): Tailoring ................................................................................................... 14
Annex D (Informative): Related Documents ................................................................................. 16
Annex E (Informative): Statement of Direction ............................................................................. 18
Annex F (Informative): Revision History for ANSI/ESD S20.20 ................................................... 19
Tables
Table 1: Grounding / Equipotential Bonding Requirements ........................................................... 5
Table 2: Personnel Grounding Requirement .................................................................................. 6
Table 3: EPA ESD Control Items.................................................................................................... 8
Table 4: Packaging Requirements ............................................................................................... 10
Table 5: ESD Susceptibility Test References for Devices ........................................................... 13
ESD Association Standard ANSI/ESD S20.20-2021
1
ESD Association Standard for the Development of an Electrostatic Discharge Control
Program for Protection of Electrical and Electronic Parts, Assemblies, and Equipment
(Excluding Electrically Initiated Explosive Devices)
1.0 PURPOSE
The purpose of this standard is to provide administrative and technical requirements for
establishing, implementing, and maintaining an ESD control program (hereafter referred to as the
"Program").
2.0 SCOPE
This document applies to organizations that manufacture, process, assemble, install, package,
label, service, test, inspect, transport, or otherwise handle electrical or electronic parts, assemblies,
and equipment susceptible to damage by electrostatic discharges greater than or equal to 100 volts
human body model (HBM) and 200 volts charged device model (CDM). Also, protection from
isolated conductors is handled by limiting the voltage on isolated conductors to less than 35 volts.
Processes that include items susceptible to lower withstand voltages may require additional control
elements or adjusted limits. Processes designed to handle items with a lower ESD withstand
voltage can still claim compliance to this standard. This document does not apply to electrically
initiated explosive devices, flammable liquids, or powders.
NOTE: The CDM voltage level used in this document is based on industry experience when managing
process essential insulators to mitigate induced voltages on devices that could lead to damage.
3.0 REFERENCED PUBLICATIONS
Unless otherwise specified, the following documents of the latest issue, revision, or amendment
form a part of this standard to the extent specified herein:
ESD ADV1.0, ESD Association's Glossary of Terms
2
ANSI/ESD S1.1, Wrist Straps
2
ANSI/ESD STM2.1, Garments – Resistive Characterization
2
ANSI/ESD STM3.1, Ionization
2
ANSI/ESD SP3.3, Periodic Verification of Air Ionizers
2
ANSI/ESD STM4.1, Worksurfaces – Resistance Measurements
2
ANSI/ESD S6.1, Grounding
(2)
ANSI/ESD STM7.1, Flooring Systems – Resistive Characterization
2
ANSI/ESD S8.1, Symbols – ESD Awareness
2
ANSI/ESD STM9.1, Footwear – Resistive Characterization
2
ANSI/ESD SP9.2, Foot Grounders – Resistive Characterization
2
ANSI/ESD STM11.11, Surface Resistance Measurement of Static Dissipative Planar Materials
2
ANSI/ESD STM11.12, Volume Resistance Measurements of Static Dissipative Planar Materials
2
ANSI/ESD STM11.13, Two-Point Resistance Measurement
2
ANSI/ESD STM11.31, Bags
2
ANSI/ESD STM12.1, Seating – Resistance Measurements
2
ANSI/ESD S13.1, Electrical Soldering/Desoldering Hand Tools
2
ESD TR53, Compliance Verification of ESD Protective Equipment and Materials
2
2
EOS/ESD Association, Inc. 218 West Court Street, Rome, NY 13440, Ph: 315-339-6937; www.esda.org
ANSI/ESD S20.20-2021
2
ANSI/ESD STM97.1, Footwear/Flooring System – Resistance Measurement in Combination with
a Person
2
ANSI/ESD STM97.2, Footwear/Flooring System – Voltage Measurement in Combination with a
Person
2
ANSI/ESD S541, Packaging Materials
2
MIL-STD-2073-1, Department of Defense Standard Practice for Military Packaging
3
4.0 DEFINITIONS
The terms used in the body of this document are in accordance with the definitions found in ESD
ADV1.0, ESD Association's Glossary of Terms, available for complimentary download at
www.esda.org. For the purposes of this standard, the following definitions apply:
conductor. A material that measures less than 1.0 x 10
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ohms point to point.
ESD control items. All the items, materials, devices, tools, and equipment used within an EPA for
the control of static electricity. (See also ESD technical elements).
insulator. Any material that measures greater than or equal to 1.0 x 10
11
ohms by ANSI/ESD
STM11.11, ANSI/ESD STM11.12, or ANSI/ESD STM11.13.
isolated conductor. A conductor that measures greater than or equal to 1.0 x 10
9
ohms from the
contact point (where the ESDS item will be contacted) to ground.
unprotected ESDS item. Any ESDS item without ESD protective packaging or coverings.
worksurface. Any surface where any type of work or processing is performed on an unprotected
ESDS item.
5.0 PERSONNEL SAFETY
THE PROCEDURES AND EQUIPMENT DESCRIBED IN THIS DOCUMENT MAY EXPOSE
PERSONNEL TO HAZARDOUS ELECTRICAL CONDITIONS. USERS OF THIS DOCUMENT
ARE RESPONSIBLE FOR SELECTING EQUIPMENT THAT COMPLIES WITH APPLICABLE
LAWS, REGULATORY CODES, AND BOTH EXTERNAL AND INTERNAL POLICY. USERS
ARE CAUTIONED THAT THIS DOCUMENT CANNOT REPLACE OR SUPERSEDE ANY
REQUIREMENTS FOR PERSONNEL SAFETY.
GROUND FAULT CIRCUIT INTERRUPTERS (GFCI) AND OTHER SAFETY PROTECTION
SHOULD BE CONSIDERED WHEREVER PERSONNEL MIGHT COME INTO CONTACT WITH
ELECTRICAL SOURCES.
ELECTRICAL HAZARD REDUCTION PRACTICES SHOULD BE EXERCISED, AND PROPER
GROUNDING INSTRUCTIONS FOR EQUIPMENT SHALL BE FOLLOWED.
THE RESISTANCE MEASUREMENTS OBTAINED THROUGH THE USE OF THESE TEST
METHODS SHALL NOT BE USED TO DETERMINE THE RELATIVE SAFETY OF PERSONNEL
EXPOSED TO HIGH AC OR DC VOLTAGES.
6.0 ESD CONTROL PROGRAM
6.1 ESD Control Program Requirements
The Program shall include both administrative and technical requirements as described herein. The
Program shall document the lowest level(s) of device ESD sensitivity that can be handled. The
Organization shall establish, document, implement, maintain, and verify the compliance of the
Program per the requirements of this document.
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