SLOA294A June   2020  – April 2024 TPS3851-Q1 , TPS7A16A-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Types of Faults and Quantitative Random Hardware Failure Metrics
  6. 3 Random Failures Over a Product Lifetime and Estimation of BFR
  7. 4 BFR Estimation Techniques
  8. 5 Siemens SN 29500 FIT model
  9. 6 IEC TR 62380
  10. 7 Recommended Assumptions for BFR Calculations
  11. 8 Special Considerations for Transient Faults
  12. 9 BFR Differences (Due to Package) Between IEC TR 62380 and SN 29500
  13. 10Effect of Power-on Hours on BFR
  14. 11What Can You Expect for TI Products
  15. 12Summary
  16. 13References
  17. 14Revision History

10 Effect of Power-on Hours on BFR

ISO 26262 recommends applying these attributes to minimize the scaling or unjustifiable reduction of the calculated BFR:

  • An accurate mission profile
  • Assessing the applicability of failure modes in the operating conditions (as specified in the mission profile)
  • Determining the fail rate per unit (on the per-hour, day, month or year for which the system is operated)

The BFR formula in IEC TR 62380 accounts for τON and τOFF, whereas SN 29500 accounts for τW.