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TXB0104: Chip Marking

Part Number: TXB0104

Tool/software:

We have a set of boards with this chip one one has the markings 2KV  which I think is correct but doesn't work.  However we have an earlier build which we believe is the same chip and this has marking SIG, and that works perfectly,

Slightly confused , can you identify what the chip marked SIG (or S1G)  as we have 500 boards out there working with SIG, but not with the later 2KV ( which seems according to datasheet be the correct part)