Hall effect bipolar sensor (TO-92) range ±140 G, supply 2.7–7 V DC

Bipolar Hall effect sensor in a TO-92 package with a magnetic sensing range of ±140 G and a supply voltage of 2.7–7 V DC. The device detects changes in magnetic field polarity and outputs a digital response when the field crosses switching thresholds. Packaged for PCB mounting, this compact sensor is intended for low-voltage systems and provides a simple interface for position, speed and proximity sensing in electronic projects and industrial control circuits.

Advantages

The sensor combines a small TO-92 form factor with bipolar Hall sensing capability, allowing detection of both north and south magnetic poles. Its wide supply range supports operation from 2.7 V to 7 V DC, enabling compatibility with common logic levels and battery-powered systems. The ±140 gauss switching range offers clear hysteresis for stable switching in fluctuating fields, and the device’s digital output simplifies integration with microcontrollers, counters and logic circuits.

Suitable for

• Position sensing in compact electromechanical assemblies
• Speed and rpm detection in small motors and fans
• Proximity detection for door, lid or shutter sensing
• Magnetic polarity detection in sensor arrays and encoders
• Low-voltage embedded and battery-powered projects

Key specifications

• Sensor type: bipolar Hall effect
• Package: TO-92 through-hole style for PCB mounting
• Magnetic range: ±140 gauss switching
• Supply voltage: 2.7–7 V DC
• Output: digital switching output (open-collector or push-pull dependent on circuit)
• Operating principle: detects polarity changes and switches when threshold crossed
• Typical applications: position, speed, proximity detection

How to use

Mount the TO-92 sensor on the PCB with the flat face oriented toward the expected magnetic source to ensure consistent switching thresholds. Connect the supply to a regulated 2.7–7 V DC source and wire the output to a microcontroller input or logic stage, adding a pull-up resistor where required by the output type. Locate and align the magnet relative to the sensor and test switching behavior by moving the magnetic pole past the device; adjust placement to achieve the desired activation distance and switching response. Observe proper power sequencing and decoupling to reduce noise-induced false switching.

Usage recommendations

Use a stable regulated supply within the specified range and include a bypass capacitor close to the sensor supply pins. If the output is open-collector, implement an appropriate pull-up resistor to the chosen logic voltage. For reliable operation in environments with variable external fields or vibration, allow for mechanical shielding or magnetic flux guidance and validate hysteresis behavior in the final assembly.