SFFSA04 October   2024 LM704A0-Q1

 

  1.   1
  2.   Trademarks
  3. 2Overview
  4. 3Functional Safety Failure In Time (FIT) Rates
  5. 4Failure Mode Distribution (FMD)
  6. 5Pin Failure Mode Analysis (Pin FMA)

3 Functional Safety Failure In Time (FIT) Rates

This section provides functional safety failure in time (FIT) rates for LM704A0-Q1 based on two different industry-wide used reliability standards:

  • Table 3-1 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11
  • Table3-2 provides FIT rates based on the Siemens Norm SN 29500-2
Table 3-1 Component Failure Rates per IEC TR 62380 / ISO 26262 Part 11
FIT IEC TR 62380 / ISO 26262 FIT (Failures Per 109 Hours)
LM704A0-Q1
Total component FIT rate 38
Die FIT rate 14
Package FIT rate 24

The failure rate and mission profile information in Table 3-1 comes from the reliability data handbook IEC TR 62380 / ISO 26262 part 11:

  • Mission profile: Motor control from Table 11
  • LM704A0-Q1 power dissipation: 3.0W
  • Climate type: World-wide table 8
  • Package factor (lambda 3): Table 17b
  • Substrate material: FR4
  • EOS FIT rate assumed: 0 FIT
Table 3-2 Component Failure Rates per Siemens Norm SN 29500-2
Table Category Device Reference FIT Rate Reference Virtual TJ
5 CMOS, BICMOS ASICs Analog and mixed HV > 50V supply LM704A0-Q1 30 FIT 75°C

The reference FIT rate and reference virtual TJ (junction temperature) in Table3-2 come 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.