Reliability

When estimating field lifetime from temperature-humidity test results, which model is commonly used to express the effect of humidity as a power of relative humidity?

  1. APeck's model
  2. BDennard scaling
  3. CThe Shockley equation
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Answer: A. Peck's model

Peck's model takes lifetime as the product of relative humidity raised to a power (an exponent of about −3) and an Arrhenius temperature term. It is used to convert results from accelerated tests such as 85 °C/85% RH and HAST into lifetime under actual temperature and humidity.

  • A. Correct. It is an acceleration model expressing humidity as a power.
  • B. Dennard scaling is a guideline for scaling.
  • C. The Shockley equation is the diode current equation.
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