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LM4040: LM4040 marking

user5148018
Prodigy 60 points
Part Number: LM4040

Hi Team,

We are wondering about Top marking as below, 4M53 ,4M5U  it seems the difference between two Marking is the last code.

What does the last code of marking represent? Thanks.

Part numberMarkingPackage | pinsStatusDescription
LM4040D41IDBZR 4M53 
4M5U 		 DBZ | 3 ACTIVE Precision Micropower Shunt Voltage Reference