What is MTTF vs. MTBF?
MTTF is defined as “Mean Time To Failure.” The point MTTF is the total device hours divided by the number of failures. The failure rate is defined as the reciprocal of the MTTF. Where no failures occurred during testing, the point MTTF and failure rate have been calculated assuming one failure. MTBF is defined as “Mean Time Between Failures”. It is the average time a system will operate without a failure. Failure may be the result of one or many faults. The MTBF is a commonly quoted reliability in engineering.
