SFFS478 February   2024 LM74502-Q1 , LM74502H-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)

3 Failure Mode Distribution (FMD)

The failure mode distribution estimation for LM74502-Q1, LM74502H-Q1 in Table 3-1 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 judgment.

The failure modes listed in this section reflect random failure events and do not include failures due to misuse or overstress. This failure mode distribution estimation is applicable for SOT-23 8 pin DDF package.

Table 3-1 Die Failure Modes and Distribution
Die Failure ModesFailure Mode Distribution (%)
GATE output stuck Low or HIZ45%
GATE output not in specification – voltage or timing 50%
Short circuit any two pins5%