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SN65HVD72: SN65HVD72DR different bottom markings

Part Number: SN65HVD72

Hi,

My end user/customer brought up this question regarding bottom marking for part# SN65HVD72DR, DC 18+. There are 3 different types of bottom markings observed and wonder if it is typical for this part:

The curve tracing has been tested and shows consistency among samples while my end user has this bottom marking question waiting to be confirmed. Please help clarify. 

Thanks,