SFFS286 September 2021 TLVH431B-Q1

2 Functional Safety Failure In Time (FIT) Rates

This section provides Functional Safety Failure In Time (FIT) rates for TLVH431B-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 for the DBV package.
Table 2-2 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11 for the DBZ package.
Table 2-3 provides FIT rates based on the Siemens Norm SN 29500-2 for both DBV and DBZ packages.

Table 2-1 Component Failure Rates for the DBV package per IEC TR 62380 / ISO 26262 Part 11

FIT IEC TR 62380 / ISO 26262	FIT (Failures Per 10⁹ Hours)
Total Component FIT Rate	5
Die FIT Rate	3
Package FIT Rate	2

Table 2-2 Component Failure Rates for the DBZ package per IEC TR 62380 / ISO 26262 Part 11

FIT IEC TR 62380 / ISO 26262	FIT (Failures Per 10⁹ Hours)
Total Component FIT Rate	4
Die FIT Rate	3
Package FIT Rate	1

The failure rate and mission profile information in Table 2-1 and Table 2-2 comes from the Reliability data handbook IEC TR 62380 / ISO 26262 part 11:

Mission Profile: Motor Control from Table 11
Power dissipation: 50 mW
Climate type: World-wide Table 8
Package factor (lambda 3): Table 17b
Substrate Material: FR4
EOS FIT rate assumed: 0 FIT

Table 2-3 Component Failure Rates for the DBV and DBZ package per Siemens Norm SN 29500-2

TABLE	CATEGORY	REFERENCE FIT RATE	REFERENCE VIRTUAL T_J
5	CMOS, BICMOS Digital, analog / mixed	20 FIT	55°C

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