Digital hall sensors

Hall sensors can be used to measure the strength of a magnetic field. The electrons of an electrical current flowing through a metal plate are deflected in the presence of a magnetic field. This leads to a Hall voltage across the plate perpendicular to the current direction and the magnetic field. This Hall voltage is proportional to the current and the magnetic field and thus permits measurement of the strength of the magnetic field. In practice, there are very often used digital Hall sensors which, apart from the Hall element, also contain an integrated amplifier and a Schmitt trigger.

Features

• SMD (SOT 89)
• Pin types (TO 92)
• Switching characteristics: switch, latch or bipolar
• Compatible with most logic families
• Magnetic threshold for Hall switches:
  Bon/Boff: 6 mT/3 mT ... 35 mT/18 mT
• Magnetic threshold for Hall latches:
  Bon/Boff: +/- 3 mT ... +/-14 mT
• Temperature range: -40°C ... +170°C

Applications

• Contactless switches, e.g. in the automotive sector
• Revolution detection in drives
• Measurement of rotational and linear movement, e.g. in mechanical engineering
• Limit switches
• Switches in soiled environments