Junction temperature

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Junction temperature is the temperature of the actual semiconductor in an electronic device. In operation it is usually higher than case temperature, the temperature of the part's exterior. The difference is equal to the power dissipated inside the device times the junction-to-case thermal resistance.

Maximum junction temperature is specified in a part's datasheet and is used when calculating the necessary case-to-ambient thermal resistance for a given power dissipation. This in turn is used to select an appropriate heat sink if necessary.

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• This page was last modified 12:35, 7 October 2007 by Wikipedia user Le Pied-bot. Based on work by Wikipedia user(s) Zondi, Alaibot, Razvan784 and Electron9 and Anonymous user(s) of Wikipedia.
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