Magnetic Speed Sensors
We offer the most comprehensive portfolio of magnetic speed sensors ICs, covering the full range of speed and speed with direction, two- and three-wire interface, magnetic encoder (ring magnet) and gear tooth sensing, Hall and GMR technology, and ASIL-compliant options for transmission, wheel speed, engine, e-motors, and many more encoder and gear tooth sensing applications.
Our innovative Hall-effect and GMR technologies provide the most robust and reliable gear tooth and ring magnet speed sensing in the world.
Thanks to decades of application and algorithm experience and close collaboration with OEMs, we develop application-specific speed sensor ICs that are optimized for your target applications—improving safety, reliability, and performance.
Our magnetic speed sensors offer:- Dynamic compensation for system-level variation (i.e., target runout, vibration, thermal gradients) reducing design-in complexity and costs and increasing reliability.
- Integrated packaging for EMC protection, as well as optional magnetic biasing that simplifies design and assembly while improving performance.
- Integration of discrete components to eliminate the need for external PCB and components, significantly reducing total system cost (third generation GTS packages).
Browse by category
Camshaft Sensor ICs
We provide fully integrated hall-effect camshaft position sensor IC solutions for EMC protection and true power-on state (TPOS). Optional back-biased magnets simplify your design while improving performance.
Crankshaft Sensor ICs
With high performance and excellent edge accuracy, our fully integrated ICs are also highly flexible. We offer optimized solutions for engines in 2-wheelers and advanced solutions that are essential for start-stop engines.
Special Purpose and E-Motor Speed Sensor ICs
Working on something other than a vehicle? Our portfolio provides optimized speed sensor IC solutions for many non-automotive applications.
Transmission Sensor ICs
Our ICs are ready for any challenge presented by fuel-efficient 6 to 10-speed transmissions, providing you with industry-leading vibration immunity and dynamic air gap capability.
Wheel Speed Sensor ICs
Our patented, best-in-class GMR technology provides low jitter and high air gap over the widest installation tolerance.
Explore our full selection of speed sensors
Documentation & Resources
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
Benefits of Dynamic Threshold Feature in ATS16351, GMR Back-Biased Speed Sensor IC
AN296257 - The Allegro ATS16351PSM [1] is a True-Power-On-State (TPOS) sensor providing the speed and position of a rotational ferromagnetic target.
Application Note
Effect of Ring Magnet Dimensions on Differential Speed Sensor Performance
AN296251 - In this application note, we describe how ring magnet dimensions affect speed sensor performance is given.
Application Note
Giant Magnetoresistance versus Hall-effect: A Comparison of Technologies for Speed Sensor Applications
Allegro MicroSystems giant magnetoresistance (GMR) effect technology offerings build on lessons learned from experience with Hall-effect devices to enable new options for speed sensing system design.
Technical Article
The Future of Automotive Wheel Sensing with GMR
P0083 - With the rise of vehicle electrification, computerized control systems, and subsystem reliability monitoring, it has become essential for systems to have accurate rotational information for each wheel of the vehicle.
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.
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
Mechanical Shift of Switch Point
AN296243 - The mechanical shift of switch point is a specification that provides detail necessary to predict the location of an output edge with respect to the integrated circuit (IC) package and the target feature. This application note illustrates how to apply this specification.
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
Brochure
Brochure: High-Resolution GMR Wheel Sensing
The Allegro A19360 high-resolution wheel speed and distance sensor provides all the robustness of a standard differential speed sensor, but with up to four times the incremental resolution from the same magnetic encoders used today.
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.
Brochure
Brochure: Allegro Wheel Speed Sensor ICs
Options to meet your evolving needs.
Application Note
System-Level Application Considerations for Magnetic Speed Sensors
AN296266 - The use of a noncontact, active, speed sensor integrated circuit (IC) greatly simplifies system design-in of a magnetic speed sensor. Although these ICs are designed to operate under a wide variety of system factors, the cautious automotive designer must contemplate certain more-subtle system considerations.