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UCC27201-Q1 MSL raiting

Other Parts Discussed in Thread: UCC27201

Dear specialist

Althoug our customer is considering UCC27201-Q1 , this device requires MSL rating is Level4.
Why does UCC27201-Q1 require MSL rating Level4 but UCC27201's MSL rating Level1.
Although it is convinience for them MSL raiting is Level1,what is difference Q1 and Catalog ?

Best regards.