Junction temperature
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Junction temperature, short for transistor junction temperature, is the temperature of the actual semiconductor in an electronic device. In operation, it is higher than case temperature and the temperature of the part's exterior. The difference is equal to the amount of heat transferred from the junction to case multiplied by the junction-to-case thermal resistance.
Junction temperature, short for transistor junction temperature, is the temperature of the actual semiconductor in an electronic device. In operation, it is higher than case temperature and the temperature of the part's exterior. The difference is equal to the amount of heat transferred from the junction to case multiplied by the junction-to-case thermal resistance.
Microscopic effects
Various physical properties of semiconductor materials are temperature dependent. These include the diffusion rate of dopant elements, carrier mobilities and the thermal production of charge carriers. At the low end, sensor diode noise can be reduced by cryogenic cooling. On the high end, the resulting increase in local power dissipation can lead to thermal runaway that may cause transient or permanent device failure. T_J = T_A + (R_{\theta JA}P_D) where: T_A = ambient temperature for the package [°C] R_{\theta JA} = junction to ambient thermal resistance [°C / W] P_D = power dissipation in package [W] R_\theta = \frac{\Delta T}{V_f I_f}
See also
Safe operating area P-N Junction Metal Semiconductor Junction
References
Text derived from https://en.wikipedia.org/w/index.php?oldid=1373630697 under CC BY-SA 4.0; modifications have been made.