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SN74AHC595: SN74AHC595PWRG4 vs SN74AHC595PWR

Part Number: SN74AHC595

Hi team,

Understand for most TI products, there is no difference between G4 and non-G4 parts as G4 was legacy to signify green products previously. However, for SN74AHC595, there is a difference in datasheet in terms of lead finishing - 

SN74AHC595PWR: NIPDAU | SN

SN74AHC595PWRG4: NIPDAU

Questions - 

1). is the datasheet correct that the two materials have different lead finishing materials? 

2). any other differences between SN74AHC595PWR and SN74AHC595PWRG4?