SFFSA11 October   2024 SN74LVC1G66-Q1

 

  1.   1
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 SOT-23 Package
    2. 2.2 SOT-SC70 Package
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)

2.2 SOT-SC70 Package

This section provides functional safety failure in time (FIT) rates for the SOT-SC70 package of the SN74LVC1G66-Q1 based on two different industry-wide used reliability standards:

  • Table 2-3 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11
  • Table 2-4 provides FIT rates based on the Siemens Norm SN 29500-2
Table 2-3 Component Failure Rates per IEC TR 62380 / ISO 26262 Part 11
FIT IEC TR 62380 / ISO 26262FIT (Failures Per 109 Hours)
Total component FIT rate6
Die FIT rate4
Package FIT rate2

The failure rate and mission profile information in Table 2-3 comes from the reliability data handbook IEC TR 62380 / ISO 26262 part 11:

  • Mission profile: motor control from Table 11
  • Power dissipation: 87.5mW
  • Climate type: world-wide Table 8
  • Package factor (lambda 3): Table 17b
  • Substrate material: FR4
  • EOS FIT rate assumed: 0 FIT
Table 2-4 Component Failure Rates per Siemens Norm SN 29500-2
TableCategoryReference FIT RateReference Virtual TJ
3 CMOS Analog switch, Bus Interface FCT, HC, LV, LVC, ALVC, VHC, and so forth 5 FIT 45°C

The reference FIT rate and reference virtual TJ (junction temperature) in Table 2-4 comes from the Siemens Norm SN 29500-2 tables 1 through 5. Failure rates under operating conditions are calculated from the reference failure rate and virtual junction temperature using conversion information in SN 29500-2 section 4.