SFFSA01 September   2024 LM70660 , LM706A0

 

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

Functional Safety Failure In Time (FIT) Rates

This section provides functional safety failure in time (FIT) rates for LM706A0 and LM70660 based on two different industry-wide used reliability standards:

  • Table 2-1 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11
  • Table 2-2 provides FIT rates based on the Siemens Norm SN 29500-2
Table 2-1 Component Failure Rates per IEC TR 62380 / ISO 26262 Part 11
FIT IEC TR 62380 / ISO 26262 FIT (Failures Per 109 Hours)
LM706A0 LM70660
Total component FIT rate 40 27
Die FIT rate 16 6
Package FIT rate 24 21

The failure rate and mission profile information in Table 2-1 comes from the reliability data handbook IEC TR 62380 / ISO 26262 part 11:

  • Mission profile: Motor control from Table 11
  • LM706A0 power dissipation: 3.3W
  • LM70660 power dissipation: 1.4W
  • Climate type: World-wide table 8
  • Package factor (lambda 3): Table 17b
  • Substrate material: FR4
  • EOS FIT rate assumed: 0 FIT
Table 2-2 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 LM706A0 30 FIT 75°C
5 CMOS, BICMOS ASICs Analog and mixed HV > 50V supply LM70660 30 FIT 75°C

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