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Part number starting with or without SN

Hello,

looking the orderable part numbers I have found :

74CBTLV1G125DCKRG4     SC70 (DCK) | 5     3000 | LARGE T&R

SN74CBTLV1G125DCKR     SC70 (DCK) | 5   3000 | LARGE T&R

What is the difference ?

I know the meaning of  "G4" suffix, but I have not clear why some parts start with "SN" and others not.

The datasheet doesn't mention the part starting without "SN".

Thanks