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Could be this? R1154N063B 150mA Voltage Regulator (Wide Input Voltage Range)
https://pdf1.alldatasheet.com/datasheet-pdf/view/201718/RICOH/R1154N063B.html
X3 would be batch no.
5 pin smd
Here's the source of the document.
http://www.standardics.nxp.com/support/documents/logic/xls/1g.2g.3g.markings.xls
It says "standard", i would think that meant non manufacturer specific.
jango.
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