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DS90UB953-Q1: Differences between DS90UB953-Q1 and DS90UB953A-Q1

Part Number: DS90UB953-Q1
Other Parts Discussed in Thread: DS90UB953A-Q1

Hi, 

We've designed a board targeting the DS90UB953TRHBTQ1. It works really well. We're working on going to higher volumes and I'm trying to solve some sourcing issues. I notice that there is a DS90UB953A-Q1 that looks very similar. Is this a drop-in replacement ? What are the major differences between the UB953 and UB953A ?