SFFS465 May   2022 TPS62901-Q1 , TPS62902-Q1 , TPS62903-Q1

 

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

2 Functional Safety Failure In Time (FIT) Rates

This section provides Functional Safety Failure In Time (FIT) rates for the TPS629xx-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)
Power Dissipation 0.5 W 1.0 W 1.5 W
Total Component FIT Rate 12 26

59
Die FIT Rate 8 22

55
Package FIT Rate 4 4

4

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: Automotive Control
  • 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 29500-2T

Table

Category

Reference FIT Rate

Reference Virtual Tj

5

CMOS, BICMOS Digital, analog/mixed

25 FIT

55°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 infromation in SN 29500-2 section 4.