Triaxis®: Unique sensing solution

Triaxis® is an innovative magnetic sensor technology capable of very precise three axis magnetic field measurements from a single sensor. Endless linear, angular and 3D applications can be developed.

Triaxis: Unique Position Sensing SolutionTraditional Hall sensors are only sensitive to the magnetic flux density perpendicular to the surface of the Hall element and consequently of the IC and package. These single-axis devices, despite enabling some applications, often require complex magnetic structures and face accuracy challenges especially over a wide temperature range (due to the thermal drift of the measured magnet).

Triaxis® Integrated Magnetic Concentrator Hall

Triaxis® sensors, on the other hand, are based on a patented innovative magnetic sensor technology that enables measurement of the three magnetic flux components (BX, BY and BZ) in a single integrated circuit. This is done by utilizing a unique Integrated Magnetic Concentrator (IMC). Using the three magnetic components, it is possible to create 2D or 3D sensors that determine rotary (angle), linear (stroke), or even joystick type motion as well as 3D-magnetometers that can output the individual magnetic (BX, BY, and BZ) components.

Triaxis: Unique Position Sensing Solution

Detailed Triaxis motions

Strengths of Triaxis® sensors

Triaxis® sensors are small, capable of high-temperature operation and can support a wide variety of sensing applications by adjusting the on-chip magnetic angle computation. Since the angular computation is a relative measurement between two or three magnetic flux components, the measurement is robust to temperature variations but also to magnetic and mechanical (for example airgap, eccentricity) tolerances. With an additional calibration process performed after module assembly, excellent linearity and accuracy can be obtained thanks to the on-chip parameters (such as 4 up to 32-pts calibration). The high sensitivity and flexibility allows a wide range of magnet shapes (disc, rod, square...) and chemistry (ferrite, NeFeB, SmCo, AlNiCo…) to be used while still reaching a high accuracy.

  • Enables a planar IC of 3D magnetic field measurement
  • Bring mechanical flexibility, with mounting in almost any orientation
  • High operating temperature
  • Provide angle computation stability versus
    • temperature variations
    • magnetic tolerances
    • mechanical tolerances
  • Allows smaller and cost effective magnet to be used


Triaxis® sensors usage

Triaxis® sensor ICs are used in many areas starting with automotive but also medical, industrial, home and building automation.

In term of applications, for automotive position sensing you’ll find triaxis® sensors in steering angle, pedal position, electronic throttle body, EGR valve, shifter, turbo actuator, motor position, chassis height, and more. Beyond automotive, and to name a few applications only, Triaxis® supports innovation in agricultural vehicles and equipment, joysticks, man-machine interfaces, heavy-duty vehicles, forklifts, robots, wheelchairs, industrial cranes, and more.

Triaxis® sensors are used for automotive position sensing in different applications - Melexis


Triaxis bike collage  Triaxis®: Unique sensing solution 
Triaxis® is a unique and innovative magnetic sensor technology capable of very precise three axis magnetic field measurement from a single sensor.

Triaxis® facts & figures

One Billion Triaxis Sensors Shipped - Melexis

Over 1 Billion Triaxis® in the field

In 2019, The 1 billionth Triaxis® position sensor was shipped


Triaxis® packages with SMD and PCB-less solutions

A variety of IC packages are available from the industry standard to Melexis advanced package solution.

A variety of IC packages are available for our Triaxis® sensors - Melexis


SMD solutions PCB-less solutions
SOIC-8, single die DMP-4, single die (Dual Mold Package)
TSSOP-16, dual die SMP-3, single die (Single Mold Package)
QFN-16, single die SMP-4, dual die (Single Mold Package)
UTDFN-8, single die

The DMP and SMP, PCB-less, are intended to be integrated without a PCB via a direct connection to the connector lead frame via welding or soldering which brings packaging, system cost, and reliability advantages.


Triaxis® strayfield immunity

SFI by Melexis

With a stray field immune mode, sensor IC drastically reduces or eliminates the effect of stray fields from other magnets or current carrying conductors found in electrified vehicles and supports both on-axis rotary or linear motion with a four-pole or two-pole magnet, respectively.

This stray field immune mode reduces design constraints especially in electrified vehicles and meets OEM requirements for stray fields up to 4kA/m.


Triaxis® ASIL-ready up to ASIL-C per die

ASIL Ready - Melexis


Melexis Triaxis® portfolio offers sensor ICs suitable for all Safety applications. As per ISO 26262, ICs solutions up to ASIL-C (SEooC) are available.

Triaxis® sensorsASIL-ready contains a suite of onboard diagnostics to ensure safe and correct operation. Melexis can provide additional supporting documentation (Safety Manual) to conduct the necessary safety analysis to ensure ASIL/ISO26262 requirements are met.


Triaxis® for harsh environments

Additionally, the 160°C operating temperature capability allows for use in actuators exposed to hot environments like a turbocharger wastegate while the enhanced linearization capability minimizes accuracy errors caused by tolerances in the mechanical assembly.


Triaxis® expertise

Triaxis - Melexis


As we make the sensor easy to use, we also share technical background. Want to learn more about the stray field immunity feature of the third generation? Read these technical papers:





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