Work out mean time to failure (chip) instantly with clear inputs, formula shown and shareable results.
FIT is failures per billion device-hours, so MTBF is 1e9 divided by FIT. The Arrhenius factor referenced to a 55 degree use condition shows why junction temperature dominates reliability: at 0.7 eV, running 40 degrees hotter multiplies the failure rate several times over.
FIT and MTBF
MTBF = 1e9 / FIT; AF = exp((Ea/k)(1/T_ref - 1/T_use))
No. It is the inverse of the failure rate during the flat part of the bathtub curve. A 100-year MTBF does not mean a part lasts 100 years.
Multiply FIT by device count and hours, then divide by 1e9. That is the figure that matters for warranty and spares planning.