How to find the right Hall Effect Sensors AI guide

Written by an AI model from its trained knowledge.

What the AI looks for in Hall Effect Sensors

Switch, latch or linear: Switches turn on near a magnet and off when it leaves. Latches toggle on alternating poles. Linear sensors output a voltage proportional to field strength. Using a latch where a switch was expected is a classic wiring mystery.
Magnetic polarity sensitivity: Unipolar parts respond to one pole only; omnipolar parts respond to either. Check which face of the package senses. Many "not working" reports are a magnet facing the wrong way.
Output stage: Most digital Hall switches are open-drain/open-collector and need a pull-up resistor to your logic voltage. Without a pull-up the output floats and reads randomly.
Supply voltage: Confirm the operating voltage covers your 3.3 V or 5 V rail. Some older parts need around 4.5 V or more. Some classic parts will not work at 3.3 V.
Sensitivity (operate/release points): Compare operate and release flux points in gauss or mT against your magnet strength and air gap. This determines detection distance and hysteresis.

Allegro MicroSystems: Hall switches, latches and linear ICs.
Honeywell: SS-series Hall sensors, including linear types.
Texas Instruments: DRV50xx Hall switches and linear sensors with modern low-voltage support.
Melexis: Hall switches, latches and 3D position sensors.
Infineon: Automotive-grade Hall switches and angle sensors.

Clone parts carrying discontinued part numbers with no datasheet from the seller.
Hall sensors on pins without the pull-up resistor the output requires.

Hall sensors are solid-state and need power, but switch faster and without wear. Reed switches need no power but are mechanical and fragile.