TPS3431 Standard Programmable Watchdog Timer With Enable |

TPS3431 (ACTIVE) Standard Programmable Watchdog Timer With Enable


Recommended alternative parts

  • TPS3431-Q1  -  AEC-Q100 qualified version of this device for automotive applications
  • TPS3850  -  A standalone window watchdog timer to sense both early and late faults
  • TPS3851  -  A standalone watchdog timer with no built-in voltage monitoring feature


The TPS3431 is a standard programmable watchdog timer with an enable feature for a wide variety of applications. The watchdog timeout features a 15% accuracy, high-precision timing (–40°C to +125°C) and 2.5% typical at 25ºC. The watchdog timeout can be programmed either by an external capacitor, or by factory-programmed default delay settings. The watchdog can be disabled via the Enable pin or the SET logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3431 is available in a small 3.00-mm ×
3.00-mm, 8-pin VSON package.


  • Factory-Programmed Precision Watchdog Timers:
    • ±15% Accurate Watchdog Timeout (WDT) Over Temperature
    • ±2.5% Accurate Watchdog Timeout (WDT) Typical at 25°C
  • Watchdog Disable Feature
  • User-Programmable Watchdog Timeout
  • Input Voltage Range: VDD = 1.8 V to 6.5 V
  • Low Quiescent Current: IDD = 10 µA (typ)
  • Active-Low Open-Drain Output
  • Enable Input (EN) and Enable Output (ENOUT)
  • Available in a Small 3-mm × 3-mm, 8-Pin VSON Package
  • Junction Operating Temperature Range:
    –40°C to +125°C

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Part number Order Number of supplies monitored VCC (Max) (V) VCC (Min) (V) Output driver type/reset output Time delay (ms) Features Rating Operating temperature range (C) Watchdog timer WDI (sec)
TPS3431 Order now 1     6.5     1.8     Active-low
200     Watchdog timer
Watchdog disable
Active-low enable
Functional safety    
Catalog     -40 to 125     Programmable    
TPS3430 Order now 1     6.5     1.6     Active-low
Programmable     Watchdog timer
Window watchdog
Watchdog disable
Functional safety    
Catalog     -40 to 125     Programmable