LMT86-Q1 Functional Safety FIT Rate, FMD and Pin FMA

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1 Failure In Time (FIT) Rates

This section provides Failure In Time (FIT) rates for LMT86-Q1 based on two different industry-wide used reliability standard. Table 1-1 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11.

Table 1-1 Component Failure Rates per IEC TR 62380 / ISO 26262 Part 11

FIT IEC TR 62380 / ISO 26262	FIT (Per 10⁹ Hours)
Total Component FIT Rate	4
Die FIT Rate	2
Package FIT Rate	2

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

Mission Profile: Motor Control from Table 11
Power dissipation: 1.0mW
Climate type: World-wide Table 8
Package factor lambda 3 Table 17b
Substrate material: FR4
EOS FIT rate assumed: 0 FIT

2 Failure Mode Distribution (FMD)

The failure mode distribution estimation for LMT86-Q1 in Table 2-1 comes from the combination of common failure modes listed in standards such as IEC 61508 and ISO 26262, the ratio of sub-circuit function size and complexity, and from best engineering judgments.

The failure modes listed in this section reflect random failure events and do not include failures due to misuse or overstress.

Table 2-1 Die Failure Modes and Distribution

Die Failure Modes	Failure Mode Distribution (%)
VOUT open (HIZ)	15%
VOUT short to VDD	20%
VOUT short to GND	20%
VOUT not in specification	45%