Hall-effect switch
A3144 unipolar Hall switch · 4.5–24 V · open-collector output pulls LOW while a magnet's south pole is near (operate ≈ 30 mT, release ≈ 15 mT) · needs a pull-up · field now 0 mT
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Typical part: A3144 unipolar Hall switch
Pins
- VCC
- GND
- OUT
Ratings and limits
| Supply | 4.5–24 V |
|---|---|
| Operate | ≈ 30 mT (south pole) |
| Release | ≈ 15 mT |
| Output | open collector, 25 mA |
How to use it
Counts magnets going past: wheel speed, door closed, motor commutation. Needs a pull-up (10 kΩ to your logic supply).