ANSI ESD S541 PDF

ANSI/ESD S – Hard Copy. ESD Association Standard for the Protection of Electrostatic Discharge Susceptible Items – Packaging Materials. ANSI/ESD S Packaging Materials for ESD Sensitive Items. Posts about ANSI/ESD S written by Desco. Antistatic is the ESD control property properly referred to as “low charging”. This is an important property for all.

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The existence of such standards and publications shall not ezd any respect preclude any member or non-member of the Association from manufacturing or selling products not conforming to such standards and publications.

Nor shall anzi fact that a standard or publication is published by the Association preclude its voluntary use by non-members of the Association whether the document is to be used either domestically or internationally. The interpretation of standards in-so-far as it may relate to a specific product or manufacturer is a proper matter for the individual company concerned and cannot be undertaken by any person acting for the ESDA.

The ESDA Standards Chairman may make comments limited to an explanation or clarification of the technical language or provisions in a standard, but not related to its application to aansi products and manufacturers.

While most types of packaging not exd static sensitive items provide physical and environmental protection, it also may harm static sensitive electronic items by allowing the accumulation or the discharge of static electricity. See Annex B for device damage information.

EOS/ESD Association, Inc.

Packaging for ESD sensitive items is commonly derived by modifying existing packaging to prevent the packaging itself from causing static damage. The packaging generally retains its physical and environmental protective qualities. ESD protective packaging has been modified further to prevent other sources of static electricity from damaging a packaged item.

This can be illustrated by considering bags. Polyethylene bags are useful packages for containing items and providing protection from physical and environmental damage. However, polyethylene bags accumulate potentially damaging amounts of static electricity. Chemicals antistats are added to the polyethylene bag to render it low charging.

The result is a low charging antistatic polyethylene bag that is less likely to damage static sensitive items. By adding a conductive layer to the low charging polyethylene bag, an ESD shielding bag is created.

This shielding bag is low charging, and shields packaged items from ESD and the electric field generated by other items. Other standard packaging including paper corrugate and plastic boxes, trays, and clamshells have, or are presently, following similar paths.

Because most physical and environmental considerations can be anai to traditional packaging design and testing methodologies, only the material properties that provide reduction or prevention of damage from static electricity need be addressed. This standard describes the packaging material properties needed to protect electrostatic discharge ESD sensitive electronic items, and references the ss541 methods for evaluating packaging and packaging materials for those properties.

Where possible, performance limits are provided. Guidance for selecting the esx of packaging with protective properties appropriate for specific applications is provided. Other considerations for protective packaging are also provided. Resistance is no longer the only property that is used to classify ESD packaging. Both documents were prepared by the At the time the version was prepared, the Air Force Steve Fowler Ajsi.

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Example of EPA Configurations Summary of Protective Properties Test Methods for Electrostatic Protective Packaging Test methods are referenced to evaluate packaging and packaging materials for these product and material properties.

Performance limits are provided. A defined location with the necessary materials, tools and equipment capable of controlling static electricity to a level that minimizes damage to ESD susceptible items. Users of this document are responsible for selecting equipment that complies with applicable laws, regulatory codes and both external and internal policy. Users are ajsi 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.

In the case of an EPA designed with continuous grounding of all conductors and dissipative items including personnelpackaging may not be necessary. Refer to Table 1, Figures 1 and 2, and Annex A for more information. Dissipative or conductive materials for intimate contact. A structure that provides electrostatic discharge shielding. If electric field shielding materials are used to provide rsd shielding, a material that provides a barrier to current flow insulator must be used in combination with the electric field shielding material.

Where this standard does not provide a test method, the user must determine the electrostatic discharge shielding properties of the packaging. See Ead G for guidance about determining discharge shielding properties. Eed of EPA Configurations 6. Tailoring is accomplished by evaluating the applicability of each requirement for the specific application. Upon completion of the evaluation, requirements may be added, modified or deleted.

Tailoring decisions, including rationale, shall be documented in the ESD control program plan. Low Charging antistatic Resistance: Summary of Protective Properties Protection Low Charging antistatic Dissipative or Conductive Resistance Discharge Shielding Property Materials that have reduced amounts of charge accumulation as compared with standard packaging materials.

Provides an electrical path for charge to dissipate from the package. Protects packaged items from the effects of static discharge that are external to the package. Charge accumulation occurs when two materials are contacted and separated from each other.

Charge magnitude and polarity are dependant on the materials involved, humidity, surface area, and other considerations. Mitigation of triboelectrification can be accomplished several ways. Increasing ani amount of charge that flows back to the original material will reduce the total amount of charge either item retains. This can be accomplished by reducing the electrical resistance between the package and the contained device.

Similar materials tend to charge less than dissimilar materials. Coating the anei interior and the contained device with the same material will reduce charge accumulation. Reduction in the amount of relative motion between the package and contained device will reduce the amount of charge accumulated.

A class of chemicals called antistats is frequently used to make packaging wnsi charging. Antistats reduce the resistance of the packaging material and provide a dsd of similar material between the package and the contained e541. This reduces charge generation through like material contact and separation. Making the package less insulative provides a path for charge to dissipate from the package.

Specific amounts of resistance are useful for different purposes. Packaging can be classified ahsi the lowest resistance part of its construction. The Resistance Classifications are illustrated in Figure 3. There is no correlation between resistance measurements and the ability of a material to be low charging. A surface conductive material shall have a surface resistance of less than 1. Volume conductive materials shall have a esx resistance of less than 1.

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Other methods may also define the electric field shielding classification. Packaging materials that are in intimate contact fsd devices should be dissipative. The calculated energy allowed inside a static discharge shielding bag shall be less than 50 nanojoules when tested according to Table 3. Field-shielding materials classified according to section 7.

When possible, testing should be performed on the finished package. By understanding these factors, the level of static protective properties may be s51 ESD threats that device will experience. Then the device should be evaluated for damage from those ESD threats, while being protected by the proposed level of packaging.

ANSI/ESD S | DESCO

By placing a conductive shunt across device leads or card connectors, the various znsi of the item share the same electrical potential. While not necessarily at ground potential, the fact that parts of the item share the same potential means that damaging current will not flow between them. Energy from direct discharge and electric fields may impact the item in a manner that does not allow the energy to equalize through the shunt, but instead through the device.

ESD packaging that offers other protective properties is usually used in conjunction with shunting devices. Care should be exercised to neutralize charge on devices prior to shunting to avoid charged device model CDM damage.

See Annex B for more information. This includes packaging such as bags, boxes paperboard and plasticsemi-rigid plastic trays, cushion wrap, foam, loose fill, tape, trays, tubes, tape and reel, shrink-wrap, and stretch-wrap.

Refer to Annex E for additional ans. Each area has the recommended ESD packaging material properties noted. As discussed in Section A. This layout shows an “islands of protection” approach to ESD safeguards.

Many manufacturing processes employ a “total factory” approach, where the entire factory is a safeguarded area.

Compliance Verification of static control packaging properties should be part of the ESD control compliance verification plan. These considerations could include chemical corrosion, plastic stress crazing, and contamination from outgassing, particulate matter, or moisture.

Guidance for plastic stress crazing can be 5s41 in EIA Electrostatic discharge to a device; or 2. Electrostatic discharge from a charged device.

This distinction is important for packaging considerations because different properties are required to manage each situation. Consider the source of the static electricity and then the path the charge must travel to anis the esc. Triboelectrification is usually the charge source. Since the discharge must pass through the package to reach the device, the package can be used to protect the device from the ESD event.

Where the package exterior is isolated from the package interior and therefore the device, it is possible for charge on the package to discharge to the device as it is removed from the package.