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SFFS167C September 2021 – September 2024 ADS117L11 , ADS127L11 , ADS127L21

2.2 WQFN Package

This section provides functional safety failure in time (FIT) rates for the WQFN package of the ADS117L11, ADS127L11, ADS127L21 and the ADS127L21B 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	8
Die FIT rate	2
Package FIT rate	6

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: 18.5mW (33mW for ADS127L21)
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
5	CMOS, BICMOS Digital, analog, or mixed	70 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.