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A prototype works but the production units fail intermittently in a cold store. The likely cause is

  • A.the absence of a second source for the device
  • B.a commercial-grade part outside its specified range
  • C.insufficient flash for the production firmware
  • D.a package unsuitable for automated assembly

Answer: B

Working on the bench at twenty degrees and failing at minus twenty is the signature of a temperature grade problem, and the oscillator and the converter are usually the first to go. The other three would fail identically at any temperature.

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