41F Hall Effect Sensor High Sensitivity Magnetic Switch

41F Hall Effect Sensor – High Sensitivity Magnetic Switch for Non-Contact Detection

The 41F Hall Effect Sensor is a highly responsive, digital magnetic switch designed to detect magnetic fields with precision and reliability. Housed in a compact TO-92 package, this sensor is perfect for applications requiring non-contact, wear-free operation. It operates on a wide voltage range from 4.5V to 24V DC, making it versatile for various electronics projects and industrial control systems.

At the core of the 41F sensor is the Hall effect principle, which generates a digital output signal (High/Low) in response to the presence or absence of a magnetic field. Its open-collector output makes it easy to interface with microcontrollers like Arduino, Raspberry Pi, or other logic devices, with just the addition of an external pull-up resistor.

Thanks to its high sensitivity, the 41F can detect even weak magnetic fields, enabling accurate sensing of position, speed, or proximity in a variety of environments. The sensor provides fast response time and stable performance, even in harsh conditions ranging from -40°C to +85°C.

Key Features:

• Magnetic field detection based on Hall effect principle

• Wide input voltage range: 4.5V to 24V DC

• Digital output (High/Low) for easy interfacing

• Open-collector output – supports pull-up configuration

• High sensitivity – detects weak magnetic fields

• Fast response time and low power consumption

• Operating temperature: -40°C to +85°C

• Compact TO-92 package – easy to integrate into PCBs

• Reliable, contactless switching for long life operation

Applications & Use Cases:

• Arduino & DIY Projects – Easily integrates with Arduino boards for motion detection, RPM counters, or magnet-based triggers

• Motor Speed & Position Sensing – Used in rotating systems to detect shaft positions or rotational speed

• Automotive Systems – Detects the position of doors, gear levers, or pedals without mechanical wear

• Industrial Automation – Provides contactless limit switch functionality in CNC machines or robotic arms

• Power Monitoring & Safety – Senses cover positions or detects magnetic safety keys in power tools or machines

• Proximity Detection – Ideal for detecting magnets in doors, drawers, or access panels in smart home or security systems

• 1. Hub Motor Speed Detection

  • Use Case: In electric bicycles, scooters, and hoverboards, the 41 Hall sensor detects the rotation of the hub motor by sensing the magnetic field of the rotor magnets.

  • Purpose: It provides feedback to the controller for speed measurement and commutation timing, ensuring smooth motor operation.

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  2. Proximity and Position Sensing

  • Use Case: In automated doors, elevators, or robotics, the sensor detects magnet presence to identify door open/close positions or end-stop detection in linear actuators.

  • Purpose: Ensures accurate motion control and prevents mechanical overrun.

    

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  3. Current Measurement in Power Circuits

  • Use Case: Integrated inside current sensing modules, the 41 Hall sensor measures magnetic field generated by current-carrying conductors.

  • Purpose: Provides non-contact current sensing, improving electrical isolation and safety in power supplies and battery management systems.

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  4. RPM and Fan Speed Sensing

  • Use Case: Installed in PC fans, automotive cooling fans, and industrial blowers, it detects the magnetic pulses from a rotating blade or magnet.

  • Purpose: Enables real-time RPM monitoring, speed regulation, and failure detection for preventive maintenance.

Why Choose the 41F Hall Effect Sensor?

The 41F offers a reliable and long-lasting solution for applications where mechanical switches may wear out or fail. Its compact form, high sensitivity, and ease of integration make it a favorite among hobbyists, engineers, and professionals alike.

Whether you’re building a smart automation project, enhancing machine safety, or creating interactive electronics, the 41F Hall Effect Sensor delivers dependable performance every time.