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SN75HVD11: Marking VN11D. Meaning of D

Part Number: SN75HVD11

Customer order and received SN75HVD11DG4.

Farnell Order Code: 1234838

https://uk.farnell.com/texas-instruments/sn75hvd11dg4/ic-transceiver-3-3v-diff-soic8/dp/1234838

As per the data sheet, the marking should be VN11.

But customer received the part with marking VN11D.

What is the meaning for D.