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SN74LVC1G18: Operating Temperature and Operating free-air temperature

Part Number: SN74LVC1G18

Hi team,

According to SN74LVC1G18DCKR datasheet, my customer has two concern about the temperature.
could you please give me some advice, thanks.

1.) What's the difference between Operating Temperature and Operating free-air temperature.

2.) Which temperature my customer should refer?

3.) Is it ok SN74LVC1G18DCKR to operate in -40 to 120?