MTBF is not an appropriate metric for semiconductors as they are not
repairable. MTBF is more of a system level question. However MTTF (MTTF equals
MTBF with a repair time of zero) is appropriate and this is freely available
from analogs external website.
select wafer fabrication data and then selecting the product provides MTTF and
FIT data. The calculator also allows customers to select any temperature they
wish for the calculation.