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Difference between several p / n

Part Number: LM2901AV

Dear All,

I've a question about LM2901AV comparator, because I've some difficult to undestand p/n construction.

In particular, what is the differences between these p/n: LM2901AVQDR and LM2901AVQDRG4?

In general, what is the difference between suffix "E4" and "G3" (for example between LM2901DRE4 and LM2901DRG3)?

Last question: if Ineed LM2901AV in SOIC 14 witha "automotive grade", what is the correct p/n I have to select?

Thanks in advance for your reply

Best Regards

Stefano Scremin