SNVA921C January   2020  – March 2024 LMR33620-Q1 , LMR33630-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 LMR33630-Q1
    2. 2.2 LMR33620-Q1
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 LMR33630AP-Q1 and LMR33620AP-Q1
  7. 5Revision History

2.2 LMR33620-Q1

This section provides Functional Safety Failure In Time (FIT) rates for the LMR33620-Q1 based on the following 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 26262 FIT (Failures Per 109 Hours)
Total Component FIT Rate 16
Die FIT Rate 6
Package FIT Rate 12

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: 370 mW
  • 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
Table Category Reference FIT Rate Reference Virtual TJ
5 CMOS, BICMOS ASICS Analog and Mixed ≤ 50-V supply 25 FIT 55°C

The Reference FIT Rate and Reference Virtual TJ (junction temperature) in Table 2-4 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.