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Reset & watchdog ICs

TPS3851-Q1

ACTIVE

Automotive, high-accuracy voltage supervisor with Integrated watchdog timer

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Data sheet

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Same functionality with different pin-out to the compared device.
TPS35-Q1 ACTIVE Automotive nano-quiescent-current precision supervisor with timeout watchdog timer 250-nA quiescent current, with enhanced watchdog accuracy, compact packaging and on-the-fly programming

TPS3851-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 1.8, 2.5, 3, 3.3, 5 Features Manual reset capable, Timeout watchdog, Undervoltage monitor only, Watchdog disable, Watchdog timer Reset threshold accuracy (%) 0.8 Iq (typ) (mA) 0.01 Output driver type/reset output Active-low, Open-drain Time delay (ms) 200 Watchdog timer WDI (s) Programmable TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
Rating Automotive Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 1.8, 2.5, 3, 3.3, 5 Features Manual reset capable, Timeout watchdog, Undervoltage monitor only, Watchdog disable, Watchdog timer Reset threshold accuracy (%) 0.8 Iq (typ) (mA) 0.01 Output driver type/reset output Active-low, Open-drain Time delay (ms) 200 Watchdog timer WDI (s) Programmable TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
VSON (DRB) 8 9 mm² (3 mm × 3 mm)
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to 125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Functional Safety-Capable
  • Input voltage range: VDD = 1.6V to 6.5V
  • 0.8% Voltage threshold accuracy
  • Low supply current: IDD = 10µA (typical)
  • User-programmable watchdog timeout
  • Factory programmed precision watchdog and reset timers:
  • Manual reset input (MR)
  • Open-drain outputs
  • Precision undervoltage monitoring:
    • Supports common rails from 1.8V to 5.0V
    • 4% and 7% undervoltage thresholds available
    • 0.5% Hysteresis
  • Watchdog disable feature
  • Available in a small 3mm × 3mm, 8-Pin VSON package
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to 125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Functional Safety-Capable
  • Input voltage range: VDD = 1.6V to 6.5V
  • 0.8% Voltage threshold accuracy
  • Low supply current: IDD = 10µA (typical)
  • User-programmable watchdog timeout
  • Factory programmed precision watchdog and reset timers:
  • Manual reset input (MR)
  • Open-drain outputs
  • Precision undervoltage monitoring:
    • Supports common rails from 1.8V to 5.0V
    • 4% and 7% undervoltage thresholds available
    • 0.5% Hysteresis
  • Watchdog disable feature
  • Available in a small 3mm × 3mm, 8-Pin VSON package

The TPS3851-Q1 device combines a precision voltage supervisor with a programmable watchdog timer. The TPS3851-Q1 comparator achieves a 0.8% accuracy (–40°C to +125°C) for the undervoltage (VITN) threshold on the VDD pin. The TPS3851-Q1 also includes accurate hysteresis on the undervoltage threshold making the device ideal for use with tight tolerance systems. The supervisor RESET delay features a 15% accuracy, high-precision delay timing.

The TPS3851-Q1 includes a programmable watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The watchdog timeouts can be programmed either by an external capacitor, or by factory-programmed default delay settings. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3851-Q1 is available in a small 3.00mm × 3.00mm, 8-pin VSON package. The TPS3851-Q1 features wettable flanks that allow for easy optical inspection.

The TPS3851-Q1 device combines a precision voltage supervisor with a programmable watchdog timer. The TPS3851-Q1 comparator achieves a 0.8% accuracy (–40°C to +125°C) for the undervoltage (VITN) threshold on the VDD pin. The TPS3851-Q1 also includes accurate hysteresis on the undervoltage threshold making the device ideal for use with tight tolerance systems. The supervisor RESET delay features a 15% accuracy, high-precision delay timing.

The TPS3851-Q1 includes a programmable watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The watchdog timeouts can be programmed either by an external capacitor, or by factory-programmed default delay settings. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3851-Q1 is available in a small 3.00mm × 3.00mm, 8-pin VSON package. The TPS3851-Q1 features wettable flanks that allow for easy optical inspection.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet TPS3851-Q1 High-Accuracy Voltage Supervisor with Integrated Watchdog Timer datasheet (Rev. B) PDF | HTML Jul 7, 2025
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML Apr 30, 2024
Functional safety information TPS3851-Q1 Functional Safety FIT Rate and Failure Mode Distribution Dec 19, 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun 28, 2019

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