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Automotive Semiconductors and Functional Safety

Which correctly describes the ASIL in ISO 26262?

  1. AIt ranges from A to D, with ASIL A representing the most stringent requirements. QM represents even more stringent requirements than ASIL D
  2. BIt ranges from A to D, with ASIL D representing the most stringent requirements. When the risk is sufficiently low, the classification is QM and it is handled by ordinary quality management
  3. CIt ranges from A to D, with ASIL D representing the components with the highest failure rate. QM represents components with no quality issues, for which all testing may be skipped
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Answer: B. It ranges from A to D, with ASIL D representing the most stringent requirements. When the risk is sufficiently low, the classification is QM and it is handled by ordinary quality management

ASIL (Automotive Safety Integrity Level) has four levels, A, B, C and D, with D the most stringent, imposing high requirements on development processes, safety mechanisms, failure rate targets and so on. For example, parts of airbag, brake and steering control are typical cases that often require ASIL D. When the risk is low and no ASIL needs to be assigned, the classification is QM (Quality Management) and development is carried out under ordinary quality management. Quality still has to be assured under QM, and testing cannot be skipped.

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More Automotive Semiconductors and Functional Safety questions

  1. A hazardous event was assessed as severity S3, exposure E4 and controllability C3, giving ASIL D. If, for the same event, only controllability were C2 (most drivers can normally avoid the hazard), what would the ASIL be?
  2. Which correctly describes a "safety goal" in ISO 26262?
  3. Which correctly pairs the descriptions of random hardware failures and systematic failures as distinguished in ISO 26262?
  4. For PMHF, the metric for the probability that a safety goal is violated due to random hardware failures, the target guideline for ASIL D is less than 10 FIT. What is this expressed as a probability per hour?
  5. Which is the correct target guideline for the single-point fault metric (SPFM) required for ASIL D?