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ANSI/ESD S20.20- 2021 2 ANSI/ESD STM97.1 , Footwear/Floori ng System – Resistance Measurement in Combination with a Person 2 ANSI/ESD STM97.2 , Footwear/F looring System – Volta ge Me asurement in Combination with a Pers…

ESD Association Standard ANSI/ESD S20.20-2021

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

ANSI/ESD S1.1, Wrist Straps

ANSI/ESD STM2.1, Garments – Resistive Characterization

ANSI/ESD STM3.1, Ionization

ANSI/ESD SP3.3, Periodic Verification of Air Ionizers

ANSI/ESD STM4.1, Worksurfaces – Resistance Measurements

ANSI/ESD S6.1, Grounding

(2)

ANSI/ESD STM7.1, Flooring Systems – Resistive Characterization

ANSI/ESD S8.1, Symbols – ESD Awareness

ANSI/ESD STM9.1, Footwear – Resistive Characterization

ANSI/ESD SP9.2, Foot Grounders – Resistive Characterization

ANSI/ESD STM11.11, Surface Resistance Measurement of Static Dissipative Planar Materials

ANSI/ESD STM11.12, Volume Resistance Measurements of Static Dissipative Planar Materials

ANSI/ESD STM11.13, Two-Point Resistance Measurement

ANSI/ESD STM11.31, Bags

ANSI/ESD STM12.1, Seating – Resistance Measurements

ANSI/ESD S13.1, Electrical Soldering/Desoldering Hand Tools

ESD TR53, Compliance Verification of ESD Protective Equipment and Materials

EOS/ESD Association, Inc. 218 West Court Street, Rome, NY 13440, Ph: 315-339-6937; www.esda.org

ANSI/ESD S20.20-2021

ANSI/ESD STM97.1, Footwear/Flooring System – Resistance Measurement in Combination with

a Person

ANSI/ESD STM97.2, Footwear/Flooring System – Voltage Measurement in Combination with a

Person

ANSI/ESD S541, Packaging Materials

MIL-STD-2073-1, Department of Defense Standard Practice for Military Packaging

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

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

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

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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ANSI/ESD S20.20-2021

6.2 ESD Control Program Manager or Coordinator

The Organization shall assign an ESD control program manager or coordinator to verify the

compliance of the Program per the requirements of this document.

6.3 Tailoring

This document, or portions thereof, may not apply to all ESD control programs. Any deviation from,

or exclusion of, a requirement of this document is considered tailoring. Tailored requirements shall

be summarized in the ESD control program plan and include the justification and technical rationale

for the deviation or exclusion of the requirement from the plan. See Annex C for more information.

7.0 ESD CONTROL PROGRAM ADMINISTRATIVE REQUIREMENTS

7.1 ESD Control Program Plan

The Organization shall prepare an ESD control program plan that addresses each of the

requirements of the Program. Those requirements include:

• Training

• Product qualification

• Compliance verification

• Grounding/equipotential bonding systems

• Personnel grounding

• ESD protected area (EPA) requirements

• Packaging

• Marking

The ESD control program plan is the principal document for implementing and verifying the

Program. The goal is a fully implemented and integrated Program that conforms to internal quality

system requirements. The ESD control program plan shall identify the areas within the Organization

that are a part of the overall ESD control program.

7.2 Training Plan

A training plan shall be established to ensure all personnel who handle or otherwise come in contact

with any ESDS items are provided with initial and recurrent ESD awareness and prevention

training. Initial training shall be provided before personnel handle ESDS items. The type and

frequency of ESD training for personnel shall be defined in the training plan. The training plan shall

include maintaining personnel training records and shall document where the records are stored.

Training methods and the use of specific techniques are at the Organization's discretion. The

training plan shall include the methods used by the Organization to verify trainee comprehension

and training adequacy.

7.3 Product Qualification Plan

A product qualification plan shall be established to ensure the ESD control items selected by the

Organization meet the requirements identified in Tables 2, 3, and 4 of this standard. This includes

the use of the test methods and test limits identified in these tables.

Product qualification shall occur during the initial selection of the ESD control item and before initial

use. It may use any of the following qualification methods:

(1) product specification review,

(2) independent laboratory evaluation, or

(3) internal laboratory evaluation.

Independent of the organization's qualification method, qualification records shall include the test

method used, the test results obtained from that method, and the test limits. Also, the qualification