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It is the responsibility of the ESD Coordinator find out the ESDS device classification once he knows the ESD Sensitivity level for the most sensitive device for his product.
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.
ESD sensitive (ESDS) device sensitivity level
The most important thing that an ESD Coordinator must know before setting up an ESD Control program for his organization is the ESD sensitivity level for the most sensitive component or part used in the product manufactured by the organization.
By knowing the ESD sensitivity level of the most sensitive ESDS component, it helps the ESD coordinator to establish the ESD controls required for his ESD Control program.
Basically an ESDS electronic device can be damaged by three common mechanisms:
• Discharge from a charged human body into the ESDS device a.k.a Human Body Model (HBM) damage mechanism
• Discharge from a charged conductive part of a machine into the ESDS device a.k.a Machine Model (MM) damage mechanism
• Discharge from a charged ESDS device to a grounded conductive surface a.k.a Charged Device Model (CDM) damage mechanism
The ESD sensitivity level of the ESDS electronic device is commonly documented in the
Material or Component Data sheet or Component Reliability Data sheet.
Some ESDS electronic component manufacturer would tabulate out all the three, i.e. HBM, MM and CDM ESD withstand voltage level and some would only tabulate out only the common HBM and MM ESD withstand voltage level of the device.
ESD withstand voltage is the maximum ESD level that the ESDS can withstand without being damaged.
Anything above the ESD withstand voltage level, the ESDS device or component would either be malfunctioned or damaged permanently.
There is a variety of testers available in the marketplace where semiconductor electronic device manufacturers could test their devices in accordance to the ANSI/ESD standards.
• HBM ESD testing : ANSI/ESD STM 5.1
• MM ESD testing : ANSI/ESD STM 5.2
• CDM ESD testing : ANSI/ESD STM 5.3.1
Knowing the ESD sensitivity levels of the most sensitive ESDS device being handled in the organization would not only help the ESD coordinator to set up appropriate ESD Controls but also would help the ESD coordinator to set up an ESD Control program which is cost effective for his organization.
Under certain circumstances where the ESD sensitivity level for the most sensitive ESDS component is unknown which occurs most of the time, the ESD coordinator can set up his ESD Control program based on ANSI/ESD S20.20 standard requirement. ANSI/ESD S20.20 standard specify controls which provide protection for ESDS component from damage by Human Body voltage greater than or equal to 100V.
By knowing the ESD sensitivity level of the most sensitive ESDS component, it helps the ESD coordinator to establish the ESD controls required for his ESD Control program.
Basically an ESDS electronic device can be damaged by three common mechanisms:
• Discharge from a charged human body into the ESDS device a.k.a Human Body Model (HBM) damage mechanism
• Discharge from a charged conductive part of a machine into the ESDS device a.k.a Machine Model (MM) damage mechanism
• Discharge from a charged ESDS device to a grounded conductive surface a.k.a Charged Device Model (CDM) damage mechanism
The ESD sensitivity level of the ESDS electronic device is commonly documented in the
Material or Component Data sheet or Component Reliability Data sheet.
Some ESDS electronic component manufacturer would tabulate out all the three, i.e. HBM, MM and CDM ESD withstand voltage level and some would only tabulate out only the common HBM and MM ESD withstand voltage level of the device.
ESD withstand voltage is the maximum ESD level that the ESDS can withstand without being damaged.
Anything above the ESD withstand voltage level, the ESDS device or component would either be malfunctioned or damaged permanently.
There is a variety of testers available in the marketplace where semiconductor electronic device manufacturers could test their devices in accordance to the ANSI/ESD standards.
• HBM ESD testing : ANSI/ESD STM 5.1
• MM ESD testing : ANSI/ESD STM 5.2
• CDM ESD testing : ANSI/ESD STM 5.3.1
Knowing the ESD sensitivity levels of the most sensitive ESDS device being handled in the organization would not only help the ESD coordinator to set up appropriate ESD Controls but also would help the ESD coordinator to set up an ESD Control program which is cost effective for his organization.
Under certain circumstances where the ESD sensitivity level for the most sensitive ESDS component is unknown which occurs most of the time, the ESD coordinator can set up his ESD Control program based on ANSI/ESD S20.20 standard requirement. ANSI/ESD S20.20 standard specify controls which provide protection for ESDS component from damage by Human Body voltage greater than or equal to 100V.
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