Arrhenius Failure Rate Equation
When solving for failure rate in the Arrhenius Calculation Factors window, the equation is:
Failure Rate = A * e-E /(KT)
Where:
A = The K factor, which equals an empirically determined constant.
E = The process activation energy in eV.
K = The Boltzmann’s constant:
• 8.623 * 10-5 eVK-1 OR
• 1.38 * 10-23 JK-1
T = The absolute temperature (degrees K).
• T = case temperature + temperature rise + 273 OR
• T = temperature override.
The Arrhenius equation uses failures/hour. For more information about the Arrhenius equation, see reliability textbooks such as Practical Reliability Engineering by Patrick O'Connor or documents such as MIL-STD-338.