Magnetic Speed Sensors
Magnetic speed sensing built for precision, performance, and safety.
Backed by decades of algorithm expertise and proprietary signal processing, our speed sensor solutions ensure reliable operation—even in harsh environments with vibration, EMI, and air gap variations. With ASIL-ready and ASIL-compliant options and support for multiple interfaces, our portfolio is built for safety-critical systems and next-generation electric mobility.
Browse by category
Camshaft Sensor ICs
Allegro provides fully integrated camshaft position sensors for EMC protection and true power on state (TPOS).
Crankshaft Sensor ICs
Allegro’s high-performance crankshaft sensors offer excellent edge accuracy and flexible integration—optimized for 2-wheelers and essential for reliable start-stop engine control.
General Purpose Speed Sensors
Allegro’s general-purpose speed sensors bring proven automotive-grade performance to industrial applications.
Interface ICs
Allegro interface ICs for speed and pressure sensors deliver fast and accurate output ideal for various automotive and industrial applications. With integrated signal conditioning algorithms, Allegro interface ICs offer system simplification and advanced diagnostics for safety-critical systems.
Transmission Sensor ICs
Featuring advanced Hall and back-biased GMR technologies, our transmission sensors deliver exceptional vibration immunity, wide air gap performance, and stable output.
Wheel Speed Sensor ICs
Our GMR technology provides low jitter and high air gap over the widest installation tolerance, it also offers high accuracy for extremely precise wheel speed and position measurement.
Documentation & Resources
Technical Article
How Speed Sensors are Making Two-Wheelers Smarter and Safer New
Two-wheelers have established themselves as a fundamental means of transportation throughout the world, being a lower-cost and smaller alternative to the automobile while maintaining freedom and independence compared to public transportation.
Application Note
Differential Hall-Effect Sensors: Safer and More Reliable for Two-Wheelers of the Future
AN296173 - The use of electronic controls for engine, transmission, and wheel speed in two- and three-wheeled vehicles is growing, particularly in developing nations. This trend is largely driven by mandates to improve air quality, fuel efficiency, and vehicle safety worldwide.
Application Note
EV Traction Motor Requirements and Speed Sensor Solutions
AN296226 - This paper explores the general requirement trends for speed and position sensors in traction motor systems, including high-speed capability, accuracy at startup, low-speed operation, immunity to vibration, EMC robustness, and safety.
Video
Allegro Differential Speed Sensor System Solutions
Seth Prentice, Strategic Marketing Manager for Allegro MicroSystems Speed Sensor IC group, discusses IC solutions for designing speed sensing applications including automotive transmissions, washing machine drum speeds, and fork lift positioning requiring reliable consistent output signals.
Technical Article
Crank Sensor IC for Stop-Start
This article describes start-stop operation and enabling Hall-effect integrated circuits, in particular the Allegro MicroSystems ATS694 and the previous generation ATS658, which are used in this application.
Application Note
Speed Sensor Protocols
AN296246 - This application note provides a detailed description of commonly used output protocols implemented in speed sensors. It also lists the benefits and drawbacks of each and provides information on the safety mechanisms these protocols offer to achieve compliance with the latest automotive safety standards.
Application Note
Fundamental Properties of Speed Sensors
The aim of this application note is to provide a solid foundation for understanding and comparing the fundamental properties of speed sensors that are valid not only for Allegro products but for speed sensors in general.
Application Note
Wheel Speed Sensors Operating in Harsh Environments
Wheel speed sensors (WSS) operate in harsh environments with limited shielding and temperature control. Allegro Microsystems has developed innovative algorithms and high-performance sensors to operate in these environments.
Application Note
Understanding Input Signal Variation in Sensor ICs with SolidSpeed Digital Architecture
AN29622 - This application note is to be used to aid the understanding of these datasheet line items. This specification change can be seen in the A19302 and A19571 datasheets and will continue to be used in many parts that use this technology moving forward
Application Note
Transmission Gear Tooth Sensing
AN296221 - In this application note learn how our industry-leading, time-proven algorithms included on our transmission ICs have been designed to handle the most stringent application conditions.
Application Note
Target Design for Hall Transmission Sensors
AN296178 - This application note details the impact of multiple target design parameters on the maximum air gap achievable with Allegro’s ATS692LSH and ATS19520LSN transmission sensors, allowing for measurement of speed and direction of rotating targets.
Application Note
Method for Mechanical Mounting Tolerance Compensation on Allegro Speed Sensors
AN296175 - Accuracy requirements for absolute mechanical edge detection on cam sensors and more generally on engine management speed sensors have noticeably increased with the need for power optimization and emissions control in car engines being sold today.
Brochure
Brochure: State-Of-The-Art Back-Biased GMR Speed Sensing
Allegro pioneers the first back-biased GMR Sensor with 50% larger air gaps. This larger air gap operation enables smaller and lighter transmissions that achieve reduced fuel consumption to help meet today's fuel economy standards.