Symbol k_B

The passage around this formula

where $E_a$ is the mechanism’s activation energy, $T_{\mathrm{use}}$ and $T_{\mathrm{test}}$ are absolute temperatures, and $k_B$ is Boltzmann’s constant. This is a genuine, useful model — it is also only as good as the assumption that $E_a$ and the mechanism are constant over the interval being extrapolated, an assumption every accelerated-aging program should state and test rather than take on faith. Semiconductor…

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