SFFS221 September   2021 TVS1401

 

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

Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the TVS1401. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

Table 4-2 through Table 4-4 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Table 4-1 TI Classification of Failure Effects
ClassFailure Effects
APotential device damage that affects functionality.
BNo device damage, but loss of functionality.
CNo device damage, but performance degradation.
DNo device damage. No impact to functionality or performance.

Figure 4-1 shows the TVS1401 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TVS1401 data sheet.

GUID-92C5D07F-714F-43E3-B00B-DCE3C95034C9-low.gifFigure 4-1 Pin Diagram

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

  • The DC signal on the protected line does not go above 14 V.

  • All other pins are connected properly for each case.

  • The slew rate of the signal on the protected line is below the specified limits according to the data sheet.

Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class
IN 1 Signal of protected line would be shorted to ground. B
IN 2 Signal of protected line would be shorted to ground. B
IN 3 Signal of protected line would be shorted to ground. B
IN 4 Signal of protected line would be shorted to ground. B
GND 5 No effect; normal operation. D
GND 6 No effect; normal operation. D
GND 7 No effect; normal operation. D
GND 8 No effect; normal operation. D
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin Name Pin No. Description of Potential Failure Effect(s) Failure Effect Class
IN 1 No effect. D
IN 2 No effect. D
IN 3 No effect. D
IN 4 No effect. D
GND 5 No effect. D
GND 6 No effect. D
GND 7 No effect. D
GND 8 No effect. D
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin Name Pin No. Shorted to Description of Potential Failure Effect(s) Failure Effect Class
IN 1 2 No effect; normal operation. D
IN 2 3 No effect; normal operation. D
IN 3 4 No effect; normal operation. D
GND 5 6 No effect; normal operation. D
GND 6 7 No effect; normal operation. D
GND 7 8 No effect; normal operation. D