QC35c - Electrostatic Discharge (ESD) Control Program:
General Requirement
For all ESD sensitive Electrical, Electronic, and Electromechanical (EEE) devices, the Subcontractor 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, the Subcontractor 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
ESD-safe Work Area Classification
|
HBM ESD Sensitivity Levels
|
Continuous Monitors
|
Grounded Floor and ESD Footwear
|
Air Ionization
|
Minimum humidity
|
Ionizers Discharge Time
|
Highly Sensitive
|
<200V to ≥50V
|
Optional
|
Optional/
Alternative to wrist strap
|
Mandatory
|
≥30%
|
± 1000 to <± 50 V in < 20 seconds
|
Extremely Sensitive
|
<50V to ≥20V
|
Optional
|
Mandatory
|
Mandatory
|
≥40%
|
± 1000 to <± 20 V in < 15 seconds
|
Critical
|
<20V
|
Mandatory
|
Mandatory
|
Mandatory
|
≥40%
|
± 1000 to <± 5
V in < 10 seconds
|
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)”.