SFFS057A March   2021  – December 2021 DRV8244-Q1

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 SPI "S" and "P" variant in HVSSOP package
    2. 4.2 SPI "S" variant in VQFN-HR package
    3. 4.3 HW variant in HVSSOP package
    4. 4.4 HW variant in VQFN-HR package
  6. 5Revision History

2 Functional Safety Failure In Time (FIT) Rates

This section provides Functional Safety Failure In Time (FIT) rates for DRV8244-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 FIT (Failures Per 109 Hours)
HW variant in HVSSOP package SPI "S" variant in HVSSOP package SPI "P" variant in HVSSOP package HW variant in VQFN-HR package SPI "S" variant in VQFN-HR package
Total Component FIT Rate 23 23 23 25 25
Die FIT Rate 9 9 9 13 13
Package FIT Rate 14 14 14 12 12

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: 1150 mW
  • 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
5CMOS,BICMOS
Digital, analog / mixed		25 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.