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This is important as it will tell the ESD Coordinator whether the device is a Class Zero device.
If the device or component is a Class Zero device, the device ESD withstand voltage is less than 250 Volts.
Human Body Model (HBM) ESDS Component Sensitivity Classification, per ANSI/ESD STM5.1
Class 0: < 250 Volts
Class 1A: 250 Volts to < 500 Volts
Class 1B: 500 Volts to < 1000 Volts
Class 1C: 1000 Volts to < 2000 Volts
Class 2: 2000 Volts to < 4000 Volts
Class 3A: 4000 Volts to < 8000 Volts
Class 3B: >=8000 Volts
Machine Model (MM) ESDS Component Sensitivity Classification, per ANSI/ESD STM5.2
Class M1: < 100 Volts
Class M2: 100 Volts to < 200 Volts
Class M3: 200 Volts to < 400 Volts
Class M4 : > or = 400 Volts
Charge Device Model (CDM) ESDS Component Sensitivity Classification, per ANSI/ESD STM5.3.1
Class C1: < 125 Volts
Class C2: 125 Volts to < 250 Volts
Class C3: 250 Volts to < 500 Volts
Class C4: 500 Volts to < 1000 Volts
Class C5: 1000 Volts to < 1500 Volts
Class C6: 1500 Volts to < 2000 Volts
Class C7 : > or = 2000 Volts
A Class Zero device is susceptible to damage by human body voltage greater than or equal to 250 Volts.
An ESD Control program which is set up in accordance to the ANSI/ESD S20.20 Standard requirement has the capability to provide protection for ESDS device which is susceptible to damage by human body voltage greater than or equal to 100 Volts.
In another word, ESD Control program which is set up in accordance to the ANSI/ESD S20.20 standard requirement is capable to provide protection for Class Zero devices which has HBM ESD withstand voltage from 100 Volts to < 250 Volts.
Electronic devices which are susceptible to damage by human body voltage less than 100 Volts requires more stringent ESD control limit than those limit specified in the ANSI/ESD S20.20 standard.
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