Reliability details

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Kindly help me with the MTBF and FIT value for the below part no.

Part#: INN3674C-H601-TL


The failure rate for the INN3674C-H601-TL is 23.99 FIT (MTBF = 41,677,000 hours). This failure rate is estimated after de-rating the high temperature reliability test data to an application use junction temperature of 55°C using an activation energy of 0.7eV and a 60% confidence level.