1. ESD Requirements: All individuals handling st atic-sensitive devices, including certain LEDs, in any manner should be trained to understand ESD and be able to prevent it. Specifically any person handling static-sensitive devices should wear a conductive wrist strap connected to a known good electrical ground. The wrist strap and ground connection should be checked every time the person re-enters the workstation or reconnects the wrist strap to ground. 2. Static Safe Workstation Requirements ESD sensitive devices can be damaged by humans, machines, or a charged body. For example, plastic boxes and bags carry charges which can damage static-sensitive devices. Therefore, a static-safe workstation should be provided whenever the static-sensitive devices are in an unprotected or vulnerable state (not in a closed Faraday cage). The workstation should never be used as a storage area for any materials including the static- sensitive devices. Workstations should also be free of static charge generators such as untreated page protectors, p ersonal items, notebooks, etc. Good manufacturing practice dictates that such items be kept at least 1 meter from ESD sensitive items. 3. Work Surfaces The ideal work surface is made from static dissipative materials, constructed so that any charged device it contacts will be discharged slowly through the resistance of the surface. A conductive surface isolated by a resistor is not recommended; conductive surfaces can absorb a discharge thus damaging the static-sensitiv e devices or causing short circuits in assemblies. 4. Grounding An accessible grounded terminal or “banana plug” receptacle should be provided for connecting the workstation operator’s wrist strap to gr ound. The resistance from the facility ESD ground to this terminal should not exceed two ohms. Wrist strap cords should be directly connected from the f acility ESD ground to the wrist strap. No other devices should be inserted into the ground cord’s path to ground, such as clothing or work surfaces. Wrist strap cords normally contain a built in, 1 megohm resistor for the operator’s protection. 5. Signs Good practice dictates that a sign, readable f rom at least one meter a way, shall be placed at each static-safe workstation. 6. Antistatic Treatments and Ionization Many static generators can be made temporarily safe by the use of topical chemicals designed for this purpose, or by the use of air ionizers. Ionizers are strongly recommended for use whenever static- sensitive devices are passed through machinery. 7. Clothing Where possible, natural fiber clothing should be worn when working with static-sensitiv e devices, avoiding synthetics such as nylon and rayon. 8. Record Keeping While up to the individual company or department, it is recommended that records be kept of manufacturing lots or work orders that involve static sensitive devices, and of periodic testing and verification of anti-static equipment.

ESD Requirements

Download PDF Report

Upload
dan-french
View
225
Download
0

Embed Size (px)

Citation preview

8/4/2019 ESD Requirements

http://slidepdf.com/reader/full/esd-requirements 1/1

1. ESD Requirements: All individuals handling static-sensitive devices, including

certain LEDs, in any manner should be trained to understand ESD and be able toprevent it. Specifically any person handling static-sensitive devices should wear aconductive wrist strap connected to a known good electrical ground. The wrist strapand ground connection should be checked every time the person re-enters theworkstation or reconnects the wrist strap to ground.

2. Static Safe Workstation Requirements ESD sensitive devices can be damaged byhumans, machines, or a charged body. For example, plastic boxes and bags carrycharges which can damage static-sensitive devices. Therefore, a static-safeworkstation should be provided whenever the static-sensitive devices are in anunprotected or vulnerable state (not in a closed Faraday cage). The workstationshould never be used as a storage area for any materials including the static-sensitive devices. Workstations should also be free of static charge generators suchas untreated page protectors, personal items, notebooks, etc. Good manufacturingpractice dictates that such items be kept at least 1 meter from ESD sensitive items.

3. Work Surfaces The ideal work surface is made from static dissipative materials,constructed so that any charged device it contacts will be discharged slowly throughthe resistance of the surface. A conductive surface isolated by a resistor is notrecommended; conductive surfaces can absorb a discharge thus damaging thestatic-sensitive devices or causing short circuits in assemblies.

4. Grounding An accessible grounded terminal or “banana plug” receptacle should beprovided for connecting the workstation operator’s wrist strap to ground. Theresistance from the facility ESD ground to this terminal should not exceed two ohms.Wrist strap cords should be directly connected from the facility ESD ground to thewrist strap. No other devices should be inserted into the ground cord’s path toground, such as clothing or work surfaces. Wrist strap cords normally contain a builtin, 1 megohm resistor for the operator’s protection.

5. Signs Good practice dictates that a sign, readable from at least one meter away,shall be placed at each static-safe workstation.

6. Antistatic Treatments and Ionization Many static generators can be madetemporarily safe by the use of topical chemicals designed for this purpose, or by theuse of air ionizers. Ionizers are strongly recommended for use whenever static-sensitive devices are passed through machinery.

7. Clothing Where possible, natural fiber clothing should be worn when working withstatic-sensitive devices, avoiding synthetics such as nylon and rayon.

8. Record Keeping While up to the individual company or department, it isrecommended that records be kept of manufacturing lots or work orders that involvestatic sensitive devices, and of periodic testing and verification of anti-staticequipment.