SNVA967C June   2020  – April 2021 LM34966-Q1 , LM5156 , LM5156-Q1 , LM51561 , LM51561-Q1 , LM51561H , LM51561H-Q1 , LM5156H , LM5156H-Q1

 

  1. 1Overview
  2. 2Functional Safety Failure In Time (FIT) Rates
  3. 3Functional Safety Failure In Time (FIT) Rates
  4. 4Failure Mode Distribution (FMD)
  5. 5Pin Failure Mode Analysis (Pin FMA)
  6. 6Pin Failure Mode Analysis (Pin FMA) – HTSSOP
  7. 7Revision History

Functional Safety Failure In Time (FIT) Rates

This section provides Functional Safety Failure In Time (FIT) rates for LM5156H, LM5156H-Q1, LM51561H, LM51561H-Q1, and LM34966-Q1 (package of HTSSOP) based on two different industry-wide used reliability standards:

  • Table 3-1 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11
  • Table 3-2 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 26262FIT (Failures Per 109 Hours)
Total Component FIT Rate12
Die FIT Rate4
Package FIT Rate8

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
  • Power dissipation: 250 mW
  • 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
TableCategoryReference FIT RateReference Virtual TJ
5CMOS/BICMOS ASICs Analog
& Mixed HV >50V supply
30 FIT75°C

The Reference FIT Rate and Reference Virtual TJ (junction temperature) in Table 3-2 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.