SNDH-T Series Hall-Effect Speed & Direction Sensors

Dec. 10, 2007
Honeywell's digital speed and direction sensors give manufacturers an alternative for replacing “sensor bearing” products, making vehicle service easier.

The SNDH-T Series Quadrature General Industrial Speed and Direction Sensors give manufacturers an alternative for replacing “sensor bearing” products, making vehicle service easier. By separating the sensor and bearing in electric motor bearing applications, the user can service the sensor without taking the vehicle apart to remove the bearing from the motor drive.


The dual-differential Hall-effect IC (integrated circuit) BiCmos technology enhances this circuit’s accuracy, allowing this sensor to detect the speed and direction of small, rotating target features with large air gaps (up to 0.08 in. (2 mm)). The sensor-to-sensor 90-deg. (quadrature) phase shift accuracy is designed to be highly repeatable due to the IC packaging technique. Honeywell places the IC so that tolerances are very tight, reducing variation in the manufacturing process.


Applications include a variety of industrial and heavy-duty vehicle applications that require extremely high resolution at wide frequency ranges (0 kHz to 15 kHz) with large air gaps such as transmissions, hydraulic motors, pumps, and gearboxes; steering assembly direction of rotation; replacement for bearings with integrated sensors; and tachometers/counters and encoders.

  • Hall-effect magnetic sensing technology
  • Dual differential Hall provides enhanced target resolution
  • Advanced performance dynamic offset self-calibration
  • Air gap up to 0.08 in. (2 mm)
  • Near zero speed
  • Automotive under-the-hood packaging integrity
  • EMI hardened
  • High-frequency switching capability: 1 Hz to 15 kHz
  • Wide operating temperature range: -40 to 302°F (-40 to 150°C)
  • Multiple connector options
  • Short circuit protection
  • Reverse voltage protection
  • Open collector output
  • Low jitter output
  • O-ring seal


  • Transmissions
  • Hydraulic motors, pumps, and gear boxes
  • Steering assembly direction of rotation
  • Replacement for bearings with integrated sensors
  • Tachometers/counters and encoders