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LM4040: LM4040CIM3/2.5/NOPB vs LM4040CIM3X/2.5/NOPB

Part Number: LM4040

What's the differences between LM4040CIM3/2.5/NOPB and LM4040CIM3X/2.5/NOPB.  It is not clear in the datasheet what the "X" designates.