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SN65HVD230: Major difference between devices

Part Number: SN65HVD230

Hello Team, 

My customer originally used the device SN65HVD230DR, unfortunately, that's no longer in stock. However, they found alternatives such as "SN65HVD230MDREP" and "SN65HVD230QDG4Q1".

The datasheets for all those components are similar and it seems to be pin compatible. So, they tried to use those alternatives in place of the original part they used.

The problem is that their CAN bus system did not work with those alternative CAN transceivers. Can you share the difference between these OPNs?