Hall-effect latch slims down motor applications

Melexis has unveiled a variant of the MLX92211, a three-wire Hall-effect latch. This new device is designed for lateral magnetic position sensing, with high ESD protection and a high output current limit. This latest addition enables motor miniaturisation by providing improved integration and cost-effective performance, making it ideal for automotive compact motors used in applications such as seat motors, sunroofs, and thermal expansion valves.

Across the automotive sector, there is an increasing demand for smaller, slimmer motor modules that do not compromise on robustness or diagnostics. This is particularly critical in seat actuators, where multiple motors must be integrated into compact assemblies without sacrificing adjustability, comfort, or compliance with safety requirements. OEMs are under constant pressure to maximise cabin space and lower vehicle weight, all while improving in-cabin functionality and supporting automated production. The same constraints apply to other areas of the vehicle, like sunroofs and thermal valves, where decreased module height and surface-mount compatibility enable slimmer mechanical designs and more flexible integration.

The IMC addresses these demands head-on with an IMC that enables lateral sensing in an SMD TSOT-3L package, thereby eliminating the need for through-hole components and aligning with modern automated assembly processes. The result is a reduced motor height, improved packaging flexibility, and optimised manufacturing workflows.

The company’s newest IMC variant is built on the proven MLX92211 platform, providing an optimised lateral-sensing option. The single-package device integrates a voltage regulator (2.7V to 24V operating range), a Hall effect sensor with advanced offset cancellation, and an open-drain output driver. The magnetic core’s enhanced offset cancellation system facilitates faster, more accurate, and robust processing, irrespective of temperature and stress, and includes a negative temperature coefficient to counteract the natural weakening of magnets at high temperatures.

The robust latch sensor can be employed in both three-wire and two-wire (with external resistor) configurations, with the 30mA current limit easily sufficient for maintaining safe and consistent operation in environments such as seat motors, where continuous current up to 25mA is often required. Combined with strong ESD protection (8kV), automatic output shut-off with self-recovery, and ASIL A functional safety readiness, the IMC meets the reliability needs of modern automotive deployments.

“With the MLX92211 IMC, we’ve responded directly to the automotive industry’s demand for more compact, application-optimised motor latch sensors,” said Minko Daskalov, product line manager at Melexis. “By enabling lateral magnetic sensing in a robust and cost-effective format, it allows engineers to reduce actuator height, increase motor integration within tight spaces – all while maintaining the performance and protection levels expected in modern automotive environments.”

Designed for automotive applications such as seat adjustment, window and sunroof controls, power doors, and expansion valves, the MLX92211 IMC supports the development of smaller motor and actuator assemblies that satisfy demanding size, performance, and safety constraints, while allowing seamless integration into automated production lines.