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LM5116: Consult for the creepage

Part Number: LM5116
Other Parts Discussed in Thread: LM5146

This a question from my customer.

Above figure is captured from LM5116 datasheet. In recommended land pattern. The Pin to Pin distance is 0.65 mm, the width of pad is 0.42 mm.

How to calculate the creepage? can we calculate by   0.65-0.42=0.23 ?

if the creepage is less than 0.6 mm, it seems can't meet the Safety requirements, so how to improve?