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TPS62080: TPS62080 :lead finish

Part Number: TPS62080

Tool/software:

The TPS62080ADSGR has two types of lead finishes: NIPDAU and NIPDAUAG.
Although the document below confirms that there are no significant differences in characteristics,
why are there two types of lead finishes for the same component?
Are there differences in the manufacturing process or other factors?

Shelf-Life Evaluation of Lead-Free Component Finishes