Introduction

When developing an ESD Control procedure, it is helpful to use informal classifications of ESD sensitivity levels.  Then each component/assembly/process can be labeled with the sensitivity level, and the ESD control procedure can specify appropriate controls.

Sensitivity Levels

Level 0.  Not Sensitive

Level 1.  Negligible Sensitivity

Level 2.  Unknown Sensitivity

Level 3.  Known Sensitivity

Description of Levels

Level 0. Not Sensitive

• Does not require ESD control.

• ESD control systems should not be used without a documented deviation notice.

• This applies to parts that do not include semiconductor components.

• This level is usually obvious and does not need to be specifically stated.

Level 1. Negligible Sensitivity

• Does not require ESD control.

• ESD control systems should not be used without a documented deviation notice.

• This applies to parts that include semiconductor components, but it is unlikely for the components to be damaged when the ESD control procedure is not observed.

• ESD does not need to be considered as a possible cause of failure during investigations.

Level 2. Unknown Sensitivity

• Does not require ESD control.

• ESD control systems should not be used without a documented deviation notice.

• This applies to parts that include semiconductor components, but it is unknown if ESD is a likely cause of failures when the ESD control procedure is not observed.

• ESD must be considered as a possible cause of failure during investigations.

Level 3. Known Sensitivity

• Requires ESD control.

• ESD control systems must be used.

• This applies to all parts that include semiconductor components, and it is likely for damage to occur when the ESD control procedure is not observed.

• ESD should be considered as a possible cause of failure during investigations.