SNVAA05 October   2020 LM60430-Q1 , LM60440-Q1

 

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

2 Functional Safety Failure In Time (FIT) Rates

This section provides Functional Safety Failure In Time (FIT) rates for LMQ61460, LMQ61460-Q1, and LMQ62440-Q1 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 LM60430-Q1 FIT (Failures Per 109 Hours) LM60440-Q1 FIT (Failures Per 109 Hours)
Total Component FIT Rate 13 14
Die FIT Rate 5 6
Package FIT Rate 8 8

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
  • Power dissipation: 400mW (for LM60430-Q1) and 500mW (for LM60440-Q1)
  • 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
TableCategoryReference FIT RateReference Virtual TJ
5Digital, Analog, Mixed25 FIT55°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.