3-Axis Magnetic Sensor


Click here for full STJ-3D TMR sensor description and datasheet

Features and Benefits

  • Small physical package: 15 (L) x 17.4 (W) x 10.5 (H) mm (0.591 x 0.685 x 0.413 inch)
  • Ultralow field noise: 10 nT or 0.0001 Gauss
  • Large magnetic field dynamic range: 20 Gauss
  • High sensitivity: 1-4 mV/V/Gauss
  • Broad frequency range of magnetic field: DC to ~7 MHz
  • Sensor resistance: ~2000 Ohm per axis (typical)
  • Absolute field measurement
  • Operation: up to 24.0 VDC or VAC
  • Built-in temperature sensor
  • High field direction accuracy
  • Low power consumption
  • No need for magnetic reset pulse circuit
  • Analog and bipolar magnetic field sensor


  • Ultrasensitive magnetic field sensing
  • Static and dynamic measurement of magnetic field
  • Detection of sub-surface magnetic activities
  • Electronic compass and navigation
  • Non-contact sensing of electrical current
  • Smart grid diagnostics
  • Medical devices
  • Spatial mapping of magnetic field
  • Measurement of magnetic spectrum from devices and environment
  • Measurement of earth and geo-magnetic field

Product Description

Micro Magnetics' STJ-3D is an integrated 3-axis magnetic solid-state sensor used to measure absolute magnetic field vectors with three field components along the X-, Y-, and Z-axis. Based on the state-of-the-art technology of magnetic quantum mechanical tunneling junction (MTJ), the sensor is featured with high sensitivity, large dynamic range, low signal noise, and low power consumption. The STJ-3D is easy to use, requiring only an applied voltage (up to 24V). It outputs three corresponding voltages for 3-axis magnetic field components. There is no need to regularly apply a large current pulse to cure the magnetic structure disordered by field sensing, as needed by other types of sensors. The internal magnetic structure of STJ-3D is robust against even Tesla-scale external field, remaining operational as a fresh sensor after extensive use.

STJ-3D operates in a wide frequency range between DC to about 7 MHz. The applied voltage can be either DC or AC. Electronic noise can be minimized by using AC modulation on the applied voltage.

One advantage of STJ-3D is that it has a built-in thermometer, allowing the measurement of both temperature and magnetic field to be measured simultaneously.

Micro Magnetics' STJ-3D is ideally suited for a wide range of applications.

Micro Magnetics also offers custom solutions -- we design and build custom sensing products which are tailored to the customer's specific application.

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Products: MTJ Field Sensor Products: Circuit Scan CS1000