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Junction temperature can be much higher than air temperature around you application. To find the temperature difference between the air and the junction, use the following equation: Temppjunction = TempAir + Rthpackage * Pchip + PPCB * RthPCB. Rthpackage is the thermal resistance of the package, which is usually in the 25-35degC/Watt range; Pdie is the total power consumed by the chip; PPCB is the total power consumed by all of the chips on the PCB; RthPCB is the thermal resistance of the PCB is the the 20-30degC/Watt: http://www.micrel.com/_PDF/App-Hints/ah-25.pdf.
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