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UCC23313: the same device marking

Part Number: UCC23313
Other Parts Discussed in Thread: UCC23513, UCC23513DWY

Hi team,

As for UCC23313DWY and UCC23513DWY, they have the same device marking 'UCC23513'.

when customer compare with 2 chips, because of same marking, he Cannot check which one is 233113 and which one is 23513
can you please let me know the reason why same marking?
How can distinguish?

Thanks.

Regards,