SFFSAW9A November 2025 – December 2025 LM65680

2 Functional Safety Failure In Time (FIT) Rates

This section provides functional safety failure in time (FIT) rates for LM65640, LM65660, and LM65680 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)
FIT IEC TR 62380 / ISO 26262	LM65680	LM65660	LM65640
Total component FIT rate	27	20	17
Die FIT rate	12	6	4
Package FIT rate	15	14	13

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: Motor control from table 11 or figure 16
Power dissipation for LM65680: 2800mW
Power dissipation for LM65660: 1500mW
Power dissipation for LM65640: 700mW
Climate type: World-wide table 8 or figure 13
Package factor (lambda 3): Table 17b or figure 15
Substrate material: FR4
EOS FIT rate assumed: 0 FIT

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

Table	Category	Reference FIT Rate	Reference Virtual T_J
5	CMOS, BICMOS ASICs analog and mixed HV > 50V supply	25 FIT	55°C

The reference FIT rate and reference virtual T_J (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 information in SN 29500-2 section 4.