Magnetic Position Sensors
Smarter sensing for motion, angle and linear position.
Allegro’s position sensors deliver accurate, contactless linear and rotary measurements across harsh automotive and industrial environments. With support for multiple output protocols, these sensors simplify design, reduce system complexity, and enable advanced diagnostics in safety-critical applications.
Browse by category
Linear Hall Sensors (1D)
Our linear position sensors deliver high-accuracy one dimensional (1D) position sensing with advanced linearization and strong immunity to air gap variations.
Motor Position Sensors (2D)
Allegro’s 2D angle sensors deliver analog and ultra-low latency (~10 µs) digital outputs for precise motor control in automotive, industrial and robotics applications.
Multi-Axis Linear and Angle Sensors (3D)
Unlock greater mechanical design flexibility and precision with Allegro’s 3DMAG™ multi-axis sensors engineered to capture complex linear and angular motion.
Documentation & Resources
Application Note
Slide By Sensing for Long Stroke applications using Allegro Angle Sensors
This application note is a guide through the design process for using angle sensor ICs for linear position sensing, including magnet choice and orientation, output linearization, and using sensor IC arrays for extending the measurement range.
Application Note
Using the A1330 in a Short Stroke Application
AN296163 - This application note is a guide for using the A1330 angle
sensor IC for short stroke rotational position sensing, including
information on magnet choice and orientation.
Application Note
Vertical Hall Technology Enables Effective Tamper Detection
A recent breakthrough in Hall-effect sensing has enabled the creation of omnidirectional magnetic sensor ICs that match all of the requirements for tamper detection.
Application Note
Fuel Level Sensor Using Hall-Effect Sensor ICs
AN296152 - Hall-based fuel level sensor ICs are developed to provide high reliability and accurate fuel level sensing for automotive applications. The application of linear and angle sensor ICs for coil-based and digital cluster indicators is presented in this application note.
Application Note
Chopper-Stabilized Amplifiers With Track-and-Hold Signal Demodulator
The conventional signal demodulator of a chopper amplifier can be substituted by track-and-hold (T/H) and averaging functions. This arrangement provides offset cancellation without requiring low-pass filters and can ignore the residual offset generated by input spikes.
Video
A31315 - 3D Magnetic Position Sensor
Discover the cutting-edge A31315 Sensor IC with multi-point linearization, planar, and hall technologies for seamless system integration.
Technical Article
Magnetic Position Sensors in Robotics
A key function of any robot is to interact with the physical world surrounding it. To achieve this, robots contain various actuators that require accurate position sensing to enable precise movement and functionality.
Application Note
Integrating Hall-Effect Magnetic Sensing Technology into Modern Household Appliances
As technology improves, Hall-effect sensor ICs are finding their way into many modern household appliances.
Technical Article
Magnetic Position Sensors Efficiently Drive E-Bike with Pedal Assist Systems
This technical article describes two designs for the pedal-rate measurement: a design using a pair of one-dimensional (1D) magnetic position sensors, which is common; and a two-dimensional (2D) magnetic speed and direction sensor design.
Application Note
Position and Level Sensing Using Hall-Effect Sensing Technology
This paper introduces Hall-effect technology, then explores how it has been applied, in particular, differentiating between the primary types of Hall sensor ICs and the highly differentiated range of sensing behaviors they can support.
Application Note
Analysis of a Hall-Effect System With Two Linear Sensor ICs for 30 mm Displacement
In this application note we are investigating how to extend the displacement range for linear detection by using two sensor ICs, using typical Allegro™ MicroSystems devices as examples.
Application Note
Guidelines for Using Allegro Angular Sensors
Many applications in different industries, such as in industrial automation and automotive sensors and actuators, require monitoring the angle of a rotating shaft either in an on-axis or off-axis arrangement. This application note is dedicated to a review of on-axis magnetic applications.
Application Note
Bipolar Switch Hall-Effect ICs
Bipolar sensor ICs are designed to be sensitive switches. (Note that the term "bipolar" refers to magnetic polarities, and is not related to bipolar semiconductor chip structures.) Hall measurement, bipolar switching, hall switch.
Application Note
Linearization Parameter Calculation for Allegro AAS33001 and AAS33051 Angle Sensor ICs
AN296161 - Magnetic angle sensors are often a good choice for fast,
reliable, contactless measurement of the angular position
of a system, especially in dirty environments where optical
encoders may not be a good fit.
Application Note
Microcontroller-Based Linearization of Angular Sensor ICs
AN296160 - Magnetic angle sensors are often a good choice for fast, reliable, contactless measurement of the angular position of a system, especially in dirty environments where optical encoders may not be a good fit.