Switches and Latches
The industry’s broadest portfolio of magnetic switches and latches.
Allegro offers a comprehensive range of magnetic switches and latches featuring both Hall-effect and TMR technologies for ultra-low power consumption and high reliability. Our portfolio includes 1D and 2D latches, continuous-time switches, and solutions tailored for automotive, industrial, and consumer applications. Designed with superior temperature stability and immunity to physical stress, these solutions bring precision and durability to digital position sensing.
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Switches
Experience reliable and contactless detection with our Hall-effect switches, featuring ultra-low power consumption and superior temperature stability for precise proximity and position sensing.
Latches
Allegro’s Hall-effect latches deliver stable, accurate position detection with exceptional jitter performance, and advanced chopper stabilization and low-noise signal processing.
Documentation & Resources
Application Note
AN296331 - How to Choose the Best Micropower Switch or Latch Magnetic Sensor for Your Application
This application note discusses the fundamental principles that govern micropower switch and latch magnetic sensors.
OnDemand Webinar
Magnetic Sensing: Maximizing Battery Life in Industrial and Consumer Applications
Join our webinar for a refresher on magnetic sensing technologies and an exploration of the latest technical innovations aimed at reducing power consumption in these versatile, reliable, and high-performance solid-state sensors.
Blog
Switches vs. Latches: Understanding the Key Differences and Their Applications
Discover how Hall-effect switches and latches, essential magnetic sensors, power smartphones, industrial equipment, automotive systems, and DC motors. Learn their differences and applications in this insightful blog post.
Whitepaper
Maximizing Robust Window Open Detection Systems with Micropower Hall-Effect Switches and Latches
Let's explore the intricacies of designing a robust and effective window open detection solution for
security systems.
Application Note
AN296330 - Selecting the Right Magnetic Switch or Latch for Your Application
This application note is intended to provide a step-by-step process to help designers pick the right Allegro switch or latch part for their specific application.
Application Note
Two-and-Three-Wire-Sensor-Interfaces
AN296233 - Electrical interfaces for active sensor integrated circuits (ICs) include both two-wire and three-wire interfaces. These two technology styles are named for the number of required connections needed to communicate the sensor output. This application note discusses use and tradeoffs of both interface styles.
Blog
The Power of Precision: Revolutionizing Switches and Latches with TMR Technology
This blog explores the benefits of TMR technology for switches and latches, highlighting how it's transforming these essential components.
Application Note
Improved Speed and Direction Sensing Using Vertical Hall Technology
The A1262 2D dual-channel Hall-effect sensor IC is offered in a 5-pin SOT23W surface-mount package, as well as a 4-pin SIP through-hole package. It features operation with traditional planar—as well as vertical—magnetic field direction.
Application Note
Digital Position Sensor ICs—Continuous-Time to Chopper-Stabilized Cross-Reference Guide
This application guide will outline the differences between the two sensor types and provide system designers with the tools needed in order to select the appropriate sensor for their system.
Application Note
Vehicle Safety Systems
Occupant safety is one of the most critical elements of the automobile design. As a result, safety systems continue to become more sophisticated in order to limit, and ultimately prevent, personal injury in the case of an accident.
Application Note
Ring Magnet Speed Sensing for Electronic Power Steering
Proper control of Electric Power Steering (EPS) systems requires both speed and direction information from the steering input shaft. This control will typically come from both high-resolution speed information and fairly coarse position information.
Application Note
Programming a Back Biased Switch for Proximity Sensing
This application note assumes the user is programming an Allegro fully integrated back biased Hall effect switch or that the user has designed an appropriate magnetic circuit to accommodate the programming range of a programmable unipolar Hall effect switch.
Application Note
Air-Gap-Independent Speed and Direction Sensing Using the Allegro A1262
The A1262 integrated circuit is an ultrasensitive dual-channel Hall-effect latch. As with conventional dual-channel latches, the quadrature outputs of the A1262 indicate rotation direction and position/speed of a rotating ring magnet target.
Application Note
Micro-Power Position Sensing in Cell Phone Applications New
This note will show how to use the Allegro™ A1171 in a standard flip or slide phone, as well as techniques for sensing three positions using only one magnet and one Hall device in a multipurpose application.
Application Note
Latching Switch Hall-Effect IC Basics
There are four general categories of Hall-effect IC devices that provide a digital output: unipolar switches, bipolar switches, omnipolar switches, and latches. Latching Hall-effect sensor ICs, often referred to as "latches," are digital output Hall-effect switches that latch output states.