Yield and quality control

Which is the general explanation of the difference between a product's "quality" and its "reliability"?

  1. AQuality refers only to appearance and reliability to price
  2. BQuality mainly indicates whether it meets specifications at shipment; reliability indicates whether it keeps functioning over its period of use
  3. CThe two mean exactly the same thing
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Answer: B. Quality mainly indicates whether it meets specifications at shipment; reliability indicates whether it keeps functioning over its period of use

Quality (initial quality) indicates whether a product performs to specification at the time of shipment. Reliability is the time-related property of continuing to function without failure under specified conditions for a specified period. Both are essential for semiconductor products.

  • A. They do not refer to appearance or price.
  • B. Correct. It is the difference between conformance at shipment and persistence over use.
  • C. They differ in whether time is involved.
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More Yield and quality control questions

  1. What is the approach called that emphasizes, when a problem occurs, going to the actual place, looking at the actual thing and confirming the actual situation?
  2. Which technique varies several process conditions (temperature, time, gas flow and so on) simultaneously and systematically to efficiently determine each factor's effect with few experiments?
  3. What is the system called that monitors equipment sensor data (temperature, pressure, power and so on) during processing, detects unusual states and flags abnormalities early?
  4. Which metric evaluates equipment productivity by multiplying the fraction of time running, the performance (speed) and the good-product rate?
  5. In a semiconductor fab, what is the time from wafer start to completion called?