QC35b Electrostatic Discharge (ESD) Control Program
General Requirement
For all ESD sensitive Electrical, Electronic, and Electromechanical (EEE) devices, Contractor shall properly handle, package, and identify in accordance with the latest revision of ANSI/ESD S20.20.
High Sensitivity Requirements
If the device has an ESD sensitivity of 200 volts or less, Contractor shall comply with the following additional requirements:
- These items/actions are forbidden:
- Pink poly static dissipative materials
- Cloth wrist straps
- Aluminized duct tape
- Anti-static sprays
- Using auxiliary ground resistance of more than 10 Ohms
- Using garments to achieve grounding
- Having electric field in ESD Protected Area of more than 200 volts/inch
- These actions are mandatory:
- Daily verifying of electrical tools’ resistance in according with Annex A of ANSI/ESD S20.20
- Discharging of cables prior to mating
- Wearing ESD safe garments
- Handling requirements from Table 1
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ESD-safe Work Area Classification
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HBM ESD Sensitivity Levels
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Continuous Monitors
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Grounded Floor and ESD Footwear
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Air Ionization
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Minimum humidity
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Ionizers Discharge Time
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Ionizer Float Potential
|
|
Highly Sensitive
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<200V to ≥50V
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Optional
|
Optional/
Alternative to wrist strap
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Mandatory
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≥30%
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± 1000 to <± 50 V in < 20 seconds
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<± 50 V
|
|
Extremely Sensitive
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<50V to ≥20V
|
Optional
|
Mandatory
|
Mandatory
|
≥40%
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± 1000 to <± 20 V in < 15 seconds
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<± 20 V
|
|
Critical
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<20V
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Mandatory
|
Mandatory
|
Mandatory
|
≥40%
|
± 1000 to <± 5
V in < 10 seconds
|
<± 5 V
|
Table 1: HBM ESD Sensitivity Levels and Requirements for Continuous Monitors, Footwear, Humidity, and Performance of Air Ionizer
Information
- ESD sensitivity is defined using the Human Body Model (HBM) of MIL-STD-883, Method 3015.
- ANSI/ESD S20.20 is for the “Development of an Electrostatic Discharge Control Program for Protection of Electrical and Electronic Parts, Assemblies and Equipment (excluding electrically initiated Explosive Devices)”.