I am not sure which IC (datasheet) you are referring to, but in general the following are some important definitions that pertain to the operating condition of the device.
TA = Ambient temperature. This is the temperature of the environment.
TC = Case temperature. This is the temperature of the case of the IC.
TJ = Operating Junction temperature. This is the temperature of the die itself under given operating
conditions. TJ must be calculated or inferred from the case and/or ambient temperature.
TJmax = Maximum Junction temperature. This is the maximum temperature that the device tolerates to guarantee
reliable operation. You need to ensure that TJ < TJmax to guarantee reliability.
Hope it helps.
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