How to understand ESD information of EFM8LB1 in Qual report?
Get EFM8LB1x_AEC_Qual_Report.pdf from RoHS Information web page.
The classification in the last column listed are the AEC classification for which voltage level passed. Silicon Labs standard was to list the classifications, not the passing voltages.
ESD-HBM refer to the test condition listed which is AEC-Q100-002. In section 3.0 on page 5 of this document it points to JS-001. That means the JEDEC document should apply here. From the classification level table as below, the Class 3A is a rated 4000 to < 8000V.
For ESD-CDM the reference document is AEC-Q100-011. Class C6 is rated ≥1000V (section 5 on page 12).