Product details


Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) 1.67, 1.73, 2.32, 2.4, 2.79, 2.88, 3.07, 3.17, 4.65, 4.8 Features Active-low enable, Manual reset, Watchdog disable, Watchdog timer Reset threshold accuracy (%) 0.8 Output driver type/reset output Active-low, Open-drain Time delay (ms) 200 Rating Catalog Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 125 open-in-new Find other Supervisor & reset ICs

Package | Pins | Size

VSON (DRB) 8 9 mm² 3 x 3 open-in-new Find other Supervisor & reset ICs


  • 0.8% Voltage Threshold Accuracy
  • Precision Undervoltage Monitoring:
    • Supports Common Rails from 1.8 V to 5.0 V
    • 4% and 7% Undervoltage Thresholds Available
    • 0.5% Hysteresis
  • Factory-Programmed Precision Watchdog and Reset Timers:
    • ±15% Accurate WDT and RST Delays
  • Watchdog Disable Feature
  • User-Programmable Watchdog Timeout
  • Input Voltage Range: VDD = 1.6 V to 6.5 V
  • Low Quiescent Current: IDD = 10 µA (typ)
  • Open-Drain Outputs
  • Manual Reset Input (MR)
  • 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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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. The TPS3851 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 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 is available in a small 3.00-mm × 3.00-mm, 8-pin VSON package.

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Exact equivalent in functionality and parametrics to the compared device:
TPS3851-Q1 ACTIVE Automotive, high-accuracy voltage supervisor with Integrated watchdog timer AEC-Q100 qualified version of this device
Similar but not functionally equivalent to the compared device:
TPS3123 ACTIVE Active-low, push-pull, supply voltage supervisor with watchdog timer & manual reset Fixed watchdog and reset time delay in a smaller SOT-23 package with push-pull output
TPS3431 ACTIVE Standard programmable watchdog timer with enable A standalone watchdog timer with no built-in voltage monitoring feature

Technical documentation

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Type Title Date
* Datasheet TPS3851 Precision Voltage Supervisor with Integrated Watchdog Timer datasheet Nov. 16, 2016
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 articles Exploring watchdog timer applications Feb. 02, 2017
Technical articles What is a watchdog timer and why is it important? Jan. 10, 2017
User guide TPS3851EVM-780 Evaluation Module Nov. 17, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

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 (...)
  • High threshold accuracy: 0.8%
  • Low IQ: 10 µA (typical)
  • Manual reset (MR) input
  • Open-drain RESET output
  • User-programmable watchdog timer

Design tools & simulation

SBVM650A.ZIP (66 KB) - PSpice Model
SBVM651A.ZIP (6 KB) - PSpice Model
SBVM652A.ZIP (66 KB) - PSpice Model
SBVM653A.ZIP (7 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
SON (DRB) 8 View options

Ordering & quality

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