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LM3671: LM3671MF-ADJ/NOPB

Part Number: LM3671

I am working on finding a date code for these parts. The bottom marking is confounding me. 

So the bottom marking on 2 of them seem to indicate 2012 January and February (2A3 & 2BL). The 3rd part is marked (PAF). I cannot find a date code explanation for the PAF parts. Any clue?