Temperature change FIT

Temperature change FIT

The Arrhenius equation is a formula the correlates temperature to the rate of an accelerant (in our case, time to failure). Using the Arrhenius equation, you can estimate temperature related FIT given the qualification and the application temperatures.


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For example, if you have a FIT of 16.7 at a reference temperature of 55C, you can predict FIT at application temperature of 75C to be 69.2 with 0.7Ea

Equation

\[\begin{aligned} \mathbf{AF} = \mathbf{exp}\left( \frac{E_a}{k} * \left( \frac{1}{T_{low}} - \frac{1}{T_{high}} \right) \right) \\ \end{aligned} \]

AF - Acceleration factor

Ea - Activation Energy

k - Boltzmann Constant

T - Temperature

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