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SFFS591 March 2023 TPS7B4255-Q1

2.2 DYB Package

This section provides functional safety failure in time (FIT) rates for the DYB package of the TPS7B4255-Q1 based on 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	12
Die FIT rate	8
Package FIT rate	4

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: 300 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 T_J
4	Power amplifier and regulator ≤ 1 Watt – (LDO)	40 FIT	70°C

The reference FIT rate and reference virtual T_J (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.