Reliability

In automotive and similar applications, what is the summary called of which temperature, voltage and operating-time conditions a product will be exposed to over its lifetime?

  1. AMission profile
  2. BData sheet
  3. CNetlist
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Answer: A. Mission profile

A mission profile is the assumed set of usage conditions over a product's life: how many hours at which temperatures, at which voltages, and how many temperature cycles. It is used to decide the required reliability test conditions and design margins.

  • A. Correct. It is the assumed usage conditions over the lifetime.
  • B. A data sheet summarizes a product's specifications.
  • C. A netlist represents circuit connectivity.
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More Reliability questions

  1. If 10,000 parts with a failure rate of 100 FIT are used for one year (about 8,760 hours), which is closest to the expected number of failures? (1 FIT = 1 failure per 10⁹ hours)
  2. On printed circuit boards and similar, what is the phenomenon called in which, under humid conditions, metal (such as silver or copper) dissolves as ions between biased electrodes, migrates and deposits in tree-like forms, causing a short?
  3. In high-k/metal gate nMOS transistors, what is the degradation called in which the threshold voltage shifts when positive gate voltage and high temperature are applied continuously?
  4. In leading-edge LSI design, what is the practice called of anticipating transistor degradation from BTI and HCI over the usage period and checking that timing is met even with degraded characteristics?
  5. 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?