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TPS3851

ACTIVE

High-accuracy voltage supervisor with Integrated watchdog timer

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Data sheet

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TPS35-Q1 ACTIVE Automotive nano-quiescent-current precision supervisor with timeout watchdog timer 250-nA IQ, enhanced watchdog accuracy, compact packaging, and on-the-fly programming

TPS3851

ACTIVE
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Product details

Rating Catalog Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 1.674, 1.728, 2.325, 2.4, 2.79, 2.88, 3.069, 3.168, 4.65, 4.8 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 Operating temperature range (°C) -40 to 125
Rating Catalog Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 1.674, 1.728, 2.325, 2.4, 2.79, 2.88, 3.069, 3.168, 4.65, 4.8 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 Operating temperature range (°C) -40 to 125
VSON (DRB) 8 9 mm² (3 mm × 3 mm)
  • Input voltage range: VDD = 1.6V to 6.5V
  • 0.8% Voltage threshold accuracy
  • Low quiescent current: IDD = 10µA (typical)
  • User-programmable watchdog timeout
  • 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
  • Factory-programmed precision watchdog and reset timers
  • Manual reset input (MR)
  • Available in a small 3mm × 3mm, 8 pin VSON package
  • Junction operating temperature range: –40°C to +125°C
  • Input voltage range: VDD = 1.6V to 6.5V
  • 0.8% Voltage threshold accuracy
  • Low quiescent current: IDD = 10µA (typical)
  • User-programmable watchdog timeout
  • 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
  • Factory-programmed precision watchdog and reset timers
  • Manual reset input (MR)
  • Available in a small 3mm × 3mm, 8 pin VSON package
  • Junction operating temperature range: –40°C to +125°C

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

The TPS3851 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.

TPS3851 is available in a small 3.00mm × 3.00mm, 8-pin VSON package.

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

The TPS3851 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.

TPS3851 is available in a small 3.00mm × 3.00mm, 8-pin VSON package.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet TPS3851 Precision Voltage Supervisor with Integrated Watchdog Timer datasheet (Rev. B) PDF | HTML Jun 19, 2025
Application note Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) Mar 17, 2020
Selection guide Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) Feb 28, 2020
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun 28, 2019
Technical article Exploring watchdog timer applications PDF | HTML Feb 2, 2017
Technical article What is a watchdog timer and why is it important? PDF | HTML Jan 11, 2017

Design & development

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Evaluation board

TPS3851EVM-780 — TPS3851 high-accuracy supervisor with window watchdog evaluation module

The TPS3851EVM-780 evaluation module (EVM) is designed for a typical configuration to evaluate the operation and performance of the TPS3851 low-quiescent current, 0.8% accuracy supervisor with integrated window watchdog timer. The EVM circuit board is configured to be a reference design for (...)
User guide: PDF
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Simulation model

TPS3851XyyE PSpice Transient Model (Rev. A)

SBVM652A.ZIP (66 KB) - PSpice model
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Simulation model

TPS3851XyyE Unencrypted PSpice Transient Model (Rev. A)

SBVM653A.ZIP (7 KB) - PSpice model
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Simulation model

TPS3851XyyS PSpice Transient Model (Rev. A)

SBVM650A.ZIP (66 KB) - PSpice model
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Simulation model

TPS3851XyyS Unencrypted PSpice Transient Model (Rev. A)

SBVM651A.ZIP (6 KB) - PSpice model
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