PMHF
Beginner
A number for how often random breakdowns in a chip could lead to danger.
Novice
Probabilistic Metric for random Hardware Failures: the expected rate at which random faults violate a safety goal, in FIT (failures per billion hours of operation). Targets: under 100 FIT for ASIL B and C, under 10 FIT for D.
Expert
Budgeted across the whole item (the vehicle function), so an SoC typically gets a fraction of it; silicon base failure rates, package failures and transient soft-error rates all count.
Explained in Automotive (Industries).