SFFS900 June   2024 LM74703-Q1 , LM74704-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 LM74703-Q1 and LM74704-Q1 in Table 3-1comes 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.

Table 3-1 Die Failure Modes and Distribution
Die Failure ModesFailure Mode Distribution (%)
GATE output voltage or timing not in specification25%
GATE Stuck at High20%
GATE stuck at Low

30%

FETGOOD fails to trip or false trip20%

Pin to Pin short

5%