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TL2845B: Operating free-air temperature

Part Number: TL2845B
Other Parts Discussed in Thread: UC2845, UC3845, TL3845B

Hi Team,

In the Recommended Operating Conditions of TL2845B, -40 to 85°C refers to TJ or TA? 

How does the customer evaluate if it represents ambient temperature? For example, how far is the ambient temperature from the IC?

In the TL2845B datasheet, the Operating free-air temperature corresponds to TJ (junction temperature);

In the UC2845 datasheet, the Operating free-air temperature corresponds to TA (ambient temperature);

Which description is correct?

TL2845B:

UC2845: