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SN74HC4040: Obsolescence & suffix questions

Part Number: SN74HC4040

Tool/software:

Hello, 

I work for BAE Systems Rochester and need some help identifying a part we have on our BOM. 

The P/N is - SN74HC4040DRG4. 

I can find the P/N SN74HC4040DR (without G4 suffix) however for accuracy I need to make sure we understand what the G4 means. 

Could you 1. Please tell me what G4 suffix on a part number means, and 2. tell me whether part number 'SN74HC4040DRG4' is still an active part? 

Many thanks.