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Humans hear ESD at > 6000v
Humans see ESD at > 8000v
Overview
Typical Electrostatic Voltages (Voltage generated at varying humidity) Person Walking Across Carpet Person Walking Across Vinyl Floor Worker At A Bench Ceramic Dips In Plastic Tubes Ceramics Dips In Vinyl Set-up Trays Ceramic Dips In Styrofoam Remove Bubble Pack from PWB’s Pack PWB’s in Foam Lined Shipping Box Volts at Relative Humidity 10% 40% 50% 35,000 12,000 6,000 2,000 11,500 14,500 26,000 21,000 15,000 5,000 800 700 4,000 5,000 20,000 11,000 7,500 3,000 400 400 2,000 3,500 7,000 5,500
– At each test level, the cost of ESD/ EOS damages increases by a factor of 10
» Component Level - Testing of components » Board Level - How many components are on a board
• • EOS (Typical causes) Inadequate Work Procedures