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LM5146-Q1: LM5146-Q1 ESD failure

Part Number: LM5146-Q1

Hello Expert, 

i am facing serious issue with LM5146-Q1 in DC DC Buck converter during ESD test .

Device failing at contact discharge for 8KV and in Air discharge test for 10 KV, 

The RC test network R=330Ohm, C= 330 pF.

We observe in both test LM5146-Q1 failing, the VCC voltage dropping to 5V from initial 7.5V.

After replacing LM5146-Q1 the same board functions normal. 

Need immediate feedback and possible cause with remedy.  

Thank you,