RMQSI Answers ForumCategory: Electrical Component ReliabilityValue of Ea for calculating MTBF
dearkundan asked 15 years ago


MTBF of an Set Top Box (STB) can be validated by an accelerated life test (ALT) by putting N number of boxes for T hrs at a stressed temperature, say 45degC. MTBF shall be NxTx Acceleration factor depending on the temperature stress.

AF can be calculated using formula “AF = exp{(Ea/k)[(1/Tu)-(1/Ta)]}”. I am stuck here. For calculating AF, we need the value of Ea, activation energy. Pls. suggest how to claculate the value of Ea for an STB or at least a healthy estimate.