Fully-integrated fluxgate magnetic sensor for open-loop applications


Product details


Features Magnetic Field Sensor Operating temperature range (C) -40 to 125 Vs (Min) (V) 3 Vs (Max) (V) 5.5 Rating Catalog open-in-new Find other Signal conditioners

Package | Pins | Size

WQFN (RTJ) 20 16 mm² 4 x 4 open-in-new Find other Signal conditioners


  • High-Precision, Integrated Fluxgate Sensor:
    • Offset: ±8 µT (Max)
    • Offset Drift: ±5 nT/°C (Typ)
    • Gain Error: 0.04% (Typ)
    • Gain Drift: ±7 ppm/°C (Typ)
    • Linearity: ±0.1%
    • Noise: 1.5 nT/√Hz (Typ)
  • Sensor Range: ±2 mT (Max)
    • Range and Gain Adjustable with External Resistor
  • Selectable Bandwidth: 47 kHz or 32 kHz
  • Precision Reference:
    • Accuracy: 2% (max), Drift: 50 ppm/°C (max)
    • Pin-Selectable Voltage: 2.5 V or 1.65 V
    • Selectable Ratiometric Mode: VDD / 2
  • Diagnostic Features: Overrange and Error Flags
  • Supply Voltage Range: 3.0 V to 5.5 V
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The DRV425 is designed for single-axis magnetic field-sensing applications and enables electrically-isolated, high-sensitivity, and precise dc- and ac-field measurements. The device provides the unique and proprietary, integrated fluxgate sensor (IFG) with an internal compensation coil to support a high-accuracy sensing range of ±2 mT with a measurement bandwidth of up to 47 kHz. The low offset, offset drift, and noise of the sensor, combined with the precise gain, low gain drift, and very low nonlinearity provided by the internal compensation coil, result in unrivaled magnetic field measurement precision. The output of the DRV425 is an analog signal proportional to the sensed magnetic field.

The DRV425 offers a complete set of features, including an internal difference amplifier, on-chip precision reference, and diagnostic functions to minimize component count and system-level cost.

The DRV425 is available in a thermally-enhanced, non-magnetic, thin WQFN package with a PowerPAD™ for optimized heat dissipation, and is specified for operation over the extended industrial temperature range of –40°C to +125°C.

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Technical documentation

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Type Title Date
* Datasheet DRV425 Fluxgate Magnetic-Field Sensor datasheet (Rev. A) Mar. 10, 2016
More literature Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Technical articles Addressing high-voltage current-sensing design challenges in HEV/EVs Nov. 04, 2019
Technical articles Current sensing in battery management systems May 29, 2019
Application notes Fluxgate for Motor Diagnostics Dec. 21, 2017
White papers Achieve greater precision, reliability with magnetic sensing technology Jun. 26, 2017
Application notes Design Considerations for Dual DRV425 Bus Bar Application Mar. 30, 2017
Application notes Bus Bar Theory of Operation Nov. 08, 2016
Technical articles SigCon Architect: The keys to your high-speed design Oct. 27, 2015
Technical articles Six ways to sense current and how to decide which to use Jul. 10, 2015

Design & development

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

Hardware development

document-generic User guide
The DRV425-BUSBAR-EVM is a complete bus bar assembly that is a non-invasive (isolated) current measurement solution up to ±100A.  This assembly includes bus bar with a circular cutout, insert, PCB, isolated standoffs, terminal blocks, and interface cable assembly to enable high current (...)
  • Current range up to 100A
  • Non-Invasive (Isolated) measurement
  • Complete assembly
  • Open-loop current sensor
  • Accurately measure AC and DC currents
document-generic User guide

The DRV425EVM is an evaluation platform for the DRV425, a complete analog front end IC and coil driver for open loop magnetic field sensing applications. The DRV425EVM allows the user to explore all the features of the DRV425 device.

  • Integrated fluxgate in a 4x4mm package
  • Internal or external reference capabilities
  • Flexible filter bandwidth settings
  • Error and Over Range flag access
  • Enables overall sensor accuracy <0.1%, best in its class

Design tools & simulation

SLAM275.ZIP (25 KB) - IBIS Model
SBOC481.ZIP (591 KB)

Reference designs

±100A Bus Bar Current Sensor using Open-Loop Fluxgate Sensors Reference Design
TIPD205 This single-supply open loop current sensing solution to accurately measure dc, ac and pulsed currents. Allows highly accurate current measurements up to 110 A
document-generic Schematic document-generic User guide
Over-the-Trace Three-Phase Current Sensing using Fluxgate Sensors Reference Design
TIDA-01467 — This reference design showcases a three-phase current sensor for current measurements by measuring the magnetic fields generated by a current carrying conductor such as a PCB trace. The sensor's are placed near a current carrying PCB trace to measure current passing through the trace.  The (...)
document-generic Schematic document-generic User guide
Fluxgate Based Displacement Sensor Reference Design
TIDA-00463 The TIDA-00463 showcases a displacement sensor for linear distance measurements in a BoosterPack form factor for TI LaunchPad.  The design is suitable for any application where a distance measurement, even through non-magnetic materials, is needed and non-contact, wear-free measurements are (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
QFN (RTJ) 20 View options

Ordering & quality

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Anti-tamper Techniques to Thwart Attacks on Smart Meters—Detecting case tamper attacks using inductive switches: TIDA-01377 Case Tamper Detection using Inductive Sensing Reference Design Demo

Watch the TIDA-01377 in action as it detects when someone opens the terminal block case of an electricity meter!  

Posted: 12-Jan-2017
Duration: 07:34

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