TLV773: PN definition

Part Number: TLV773

Tool/software:

Hi Team

My customer side want to choose TLV77333PDQNR(Vout 3.3V/ X2SON package).

But it have three different PN

TLV77333PDQNR

TLV77333PDQNR.A

TLV77333PDQNR3

May I know what is different? do we also have any document to explain it?

BRs

Brian