Windchill Risk and Reliability Desktop Help > Windchill Prediction > Prediction Part Data > Prediction Data Pane > Temperature Rise Calculation Window > Junction Temperature Calculation Methods
Junction Temperature Calculation Methods
As described in Calculate Thermal Resistance Window, the PRISM and 217Plus models support different methods for calculating junction temperature. You can use all four methods for semiconductors and resistors. You can use all but the second method for integrated circuits. For descriptions of terms, see Basic Temperature Parameters.
Method
Description
Ambient Temp + Actual Temp Rise
This method requires you to enter a value for Actual Temp Rise. This value, which is shown for Computed Junction Temperature, is added to the ambient temperature.
Ambient Temperature + Delta-T * Stress
This method requires you to enter values for Temp Rise (Delta-T) and the fields for current or power so that a current or power ratio can be calculated. This current or power ratio is multiplied by the value for Temp Rise. This final value, which is shown for Computed Junction Temperature, is added to the ambient temperature.
Ambient Temperature + Theta-X * P
This method requires you to enter values for Thermal Resistance (Theta-X) and Power Dissipation (P), which are equivalent to Thermal Resistance and Operating Power, the fields that normally appear in the Prediction Data pane for other models.
Case Temp + Theta-X * P
This calculation is like the one described above except that it uses the case temperature and not the ambient temperature.