4. Phase 4: Analysis & Classification – Did It Survive?
After applying the ESD pulses, the final step is to determine if the device has failed and, based on the results, assign it a sensitivity classification.
Defining Failure
The rule for determining failure is straightforward. A part is considered to have failed if, after being exposed to the ESD pulses, it no longer meets the performance requirements specified in its official device data sheet.
Assigning a Classification
Based on the lowest voltage level that caused a failure, the microcircuit is assigned a classification. This provides a simple, standardized way to understand and compare the ESD sensitivity of different devices.
| Class | Definition |
| A | Any part that fails after exposure to an ESD pulse of 200 volts or less. |
| B | Any part that passes 200 volts, but fails after exposure to an ESD pulse of 400 volts. |
| C | Any part that passes after exposure to an ESD pulse of 400 volts. |