Linear Hall-effect sensors are not a specific brand but a category of sensors used to measure magnetic fields linearly. These sensors are produced by various companies worldwide, including Allegro MicroSystems (USA), Honeywell (USA), and Melexis (Belgium). They serve industries such as automotive, industrial automation, and consumer electronics, providing precise magnetic field detection for applications like position sensing, current measurement, and speed detection. Key products include analog output Hall-effect sensors, programmable linear sensors, and integrated solutions for robust performance in harsh environments.