Latching Hall Switches

Latching Hall switches are a type of magnetic sensor that has a unique feature: they maintain their output state even after the magnetic field is removed or changes.
CategoryModelOperating VoltageReverse VoltageMagnetic Operate PointMagnetic Release PointOperating Temperature RangePackageAlternative toDocument
Latching Hall SwitchesHK402F3.0V-60V-0.5 V25-25-40 to 150°CSOT23 TO92SSS460Download
Latching Hall SwitchesHK70X/HK71X3.8V-30V-40V75-75-40 to 150°CSOP8 TO94SS526DT/AH276Download
Latching Hall SwitchesHK4013.0V-60V-60V45-45-40to150°CSOT23 TO92SSS41F/SS40A/US1881/MT8361Download
Latching Hall SwitchesHK5052.7V-30V-20V135-135-40to150°CSOT23 TO92SHAL1505Download
Latching Hall SwitchesHK5042.7V-30V-20V80-80-40to150°CSOT23 TO92SAllegro A1210/HAL1504Download
Latching Hall SwitchesHK5022.7V-30V-20V25-25-40to150°CSOT23 TO92SA1202/HAL1502/CH442SRDownload
Latching Hall SwitchesHK5012.7V-30V-20V9-9-40 to 150°CSOT23 TO92SA1201/HAL1501/HAL202Download
Latching Hall SwitchesHK401F3.0V-60V-60V45-45-40to150°CSOT23 TO92SSS41F/SS40A/US1881/MT8361/EW4127611Download
Latching Hall SwitchesHK50y2.7V-30V-20V120-120-40 °C up to 150 °CSOT23 TO92SA1212/HAL1562Download

Once triggered by a magnetic field, latching Hall switch will remain in its activated or deactivated state until it’s specifically reset, typically by applying a reverse magnetic field or a specific external signal. This characteristic makes them distinct from non-latching (or “bipolar“) Hall switches, which return to their original state when the magnetic field is no longer present.

Key Characteristics and Features of Latching Hall Switches

Toggle Behavior: Latching Hall switches toggle between two stable output states (ON and OFF) when exposed to a magnetic field, and they stay in that state until manually or externally reset.

Low Power Consumption: They are often designed to consume very little power, making them suitable for battery-powered applications, as they only draw power when changing states.

Bi-Stable Operation: Latching Hall switches have a bi-stable operation, meaning they require a deliberate action (usually a magnetic polarity change or a reset signal) to change their state.

Memory Function: These switches are often used in applications where it’s important to remember the switch’s state, even when the magnetic influence is removed. For example, in some automotive applications, they can be used to detect the position of a gear shifter or a door latch.

Security and Tamper Detection: Latching Hall switches can be used in security systems to detect the opening or closing of doors and windows. Once triggered, they will stay in their state, making them suitable for alarm systems.

Energy-Efficient Switching: Their low power consumption and ability to maintain state without constant power draw make them suitable for energy-efficient systems.

Position Detection: Latching Hall switches are used in various applications where position detection is needed, such as detecting the position of a valve or a movable mechanical component.

Common Applications of Latching Hall Switches

Automotive Gear Shift Detection: In automatic transmissions, latching Hall switches can be employed to determine the position of the gear shifter. Once the gear is shifted, the Hall switch toggles its state, providing feedback to the vehicle’s control system.

Door and Window Position Detection: Latching Hall switches are often used in security and home automation systems to detect the opening and closing of doors and windows. When a door or window is opened or closed, the switch toggles its state, triggering alarms or activating/deactivating related systems.

Fluid Valve Position Sensing: Latching Hall switches find use in industrial applications to monitor the position of valves controlling the flow of liquids or gases. They can help control and monitor processes by toggling their state as the valve is opened or closed.

Magnetic Tamper Detection: These switches are employed in security systems to detect unauthorized tampering. For example, they can be installed in electronic equipment cabinets, and if the cabinet door is opened, the Hall switch will toggle its state, triggering an alert.

Energy-Efficient Lighting Control: Latching Hall switches can be used in smart lighting systems to toggle the state of lighting fixtures or appliances. Once toggled on or off, they stay in that state until a user or system command changes it, helping to save energy.

Position Feedback in Robotics: Robotics and automation systems often use latching Hall switches to provide feedback on the position of robotic arms or other mechanical components. This feedback ensures precise and repeatable movement control.

Medical Devices: Latching Hall switches are found in various medical devices, such as infusion pumps and ventilators, to monitor the position of mechanical components and ensure proper functioning.

HVAC (Heating, Ventilation, and Air Conditioning) Systems: These switches can be used to detect the position of dampers or vents, allowing for efficient control of airflow in HVAC systems.

Automated Machinery: Latching Hall switches are employed in manufacturing and industrial machinery for position sensing and process control. They can help ensure that machines are in the correct operating state.

Consumer Electronics: Some consumer electronics devices, such as flip phones or cases with flip covers, use latching Hall switches to detect when the cover is closed or opened, activating or deactivating the device’s screen or functions accordingly.


These applications highlight the versatility and reliability of latching Hall switches in various industries, where their ability to toggle between states and remember their condition is crucial for precise control and monitoring.