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SFFS816 March 2024 TMUX4051-Q1 , TMUX4052-Q1

2.3 WQFN Package

This section provides functional safety failure in time (FIT) rates for the WQFN package of the TMUX405x-Q1 based on two different industry-wide used reliability standards:

Table 2-5 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11
Table 2-6 provides FIT rates based on the Siemens Norm SN 29500-2

Table 2-5 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	10
Die FIT rate	5
Package FIT rate	5

The failure rate and mission profile information in Table 2-5 comes from the reliability data handbook IEC TR 62380 / ISO 26262 part 11:

Mission profile: motor control from table 11
Power dissipation: 130 mW
Climate type: world-wide table 8
Package factor (lambda 3): table 17b
Substrate material: FR4
EOS FIT rate assumed: 0 FIT

Table 2-6 Component Failure Rates per Siemens Norm SN 29500-2

Table	Category	Reference FIT Rate	Reference Virtual T_J
5	BICMOS ASICs Analog and Mixed =< 50V supply	20 FIT	55°C

The reference FIT rate and reference virtual T_J (junction temperature) in Table 2-6 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.