This calculation is applicable to all ICs.
We normally give our FIT rate at 25ºC. In this case it is 21.6 (in the reliability report).
First you calculate the AfT (acceleration factor) with the exponential formula (given in the reliability report):
We normally give our FIT rate at 25ºC. In this case it is 21.6 (in the reliability report).
First you calculate the AfT (acceleration factor) with the exponential formula (given in the reliability report):
where,
AfT = Acceleration factor due to Temperature
k = Boltzmann’s Constant (8.617 x 10-5 eV/°K)
Tu = Temperature at Use (°K) (or 25ºC)
Ts = Temperature at Stress (°K) (desired temperature)
Ea = Activation Energy (e.g. 0.7 ev, this data is given in the reliability report)
AfT is the factor by which the FIT rate at 25ºC is worsened at the desired temperature, so you have to multiply the FIT rate by AfT to obtain the new FIT rate.