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 DPPM given the qualification and the application temperatures.


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For example, if you have a DPPM of 17 at a qualification temperature of 105C, you can predict temperature related DPPM to drop to nine at 80C with 0.3 Ea.

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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