What is this component? I need to replace it. How to get replacement.?
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From the code (and silkscreen) looks like a BAT54C, common cathode, dual diode. Several possible manufacturers, but here's a link to the Vishay datasheet.
The date and lotcodes also fit with specific SOT23 marking pattern in the general Vishay diode marking datasheet.
A photo (sadly with poor contrast) of the Vishay partv from the Newark website shown below 
And a better photo from icsc here. (link provided by nanash1 in the comments).
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1\$\begingroup\$ lcsc has a better photo of the Vishay markings. \$\endgroup\$– nanash1Commented Nov 13, 2023 at 7:58