Texas Instruments gives FIT values for components on https://www.ti.com/quality/docs/estimator.tsp
As an example, the following data is output for SNJ54AC04J
Part Number FIT UseTemp Eact TestTemp
SNJ54AC04J 1.1 55 °C 0.7 eV 125 °C
We have two questions :
Q1 Do the temperatures 55 °C and 125 °C refer to PCB temperatures, or junction temperatures (or something else)?
Q2 TI appears to use always activation energy of 0.7 eV, while MIL-HDBK-217F (2 December 1991) recommends 0.35 eV for digital integrated circuits (and 0.65 eV for linear integrated circuits). How would you comment?
