Testing and inspection

Which quality metric expresses the number of defects per million shipped products?

  1. AFIT
  2. BCp
  3. CDPPM
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Answer: C. DPPM

DPPM (Defective Parts Per Million) expresses the number of defective parts per million shipped. Automotive semiconductors and similar products require very low DPPM, making it important to reduce defects missed in test. FIT is a failure rate over time, and Cp is a process capability index.

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More Testing and inspection questions

  1. What is the main purpose of testing in semiconductor manufacturing?
  2. In wafer testing, where on the chip do the probe card needles make contact?
  3. What is the basic method for judging whether a chip is good in logic circuit testing?
  4. In testing, what is the set of sequences of 0 and 1 signals applied to a chip's inputs, together with the expected responses, called?
  5. What are the dedicated patterns called, placed between chips on the wafer (in scribe lines) and elsewhere, used to measure characteristics of transistors, resistors and the like to evaluate the process?