Honeywell Sensing and Control SS340RT and SS440R Digital Position Sensors

Honeywell has expanded its Hall-effect sensor portfolio with the new SS340RT Series and SS440R Series Unipolar Hall-Effect Digital Position Sensors. As unipolar devices, they are designed to respond to a single pole. These devices enhance our existing unipolar Hall-effect sensor portfolio by offering the following:
  1. Subminiature SOT-23 surface mount package
  2. Reverse polarity protection
  3. Low 3 V capability
  4. Price competitive

SS340RT Series: Subminiature SOT-23 surface mount package takes up less space on the printed circuit board; supplied on tape and reel for automated pick and place assembly, often helping to reduce manufacturing costs; responds to North pole.

SS440R Series: Leaded flat TO-92 style package (bulk packaging, 1000 units per bag). Future options will include ammopack (fan-fold) type tape, with straight or formed leads for automated assembly; responds to South pole.

These sensors are:

Price competitive: Honeywell has optimized the size of the integrated circuit, saving on manufacturing costs while still meeting customer requirements; these savings result in lower costs to customers

Economical: Package is supplied on tape and reel (SS340RT Series), often allowing for automated, lower-cost pick and place assembly which helps the customer reduce manufacturing costs; low voltage 3 V capability helps reduce power consumption

Small: Small footprint takes up less space on the PC board, typically allowing for more components on the same board

Flexible: Sinking output with open collector allows the sensor to interface with many electrical circuits without buffering; 3 to 24 Vdc supply voltages up to 125°C [257°F] and 3 to 12 Vdc voltage operating at 150 °C [257 °F] enhance application flexibility

Stable: Thermally balanced integrated circuit provides stable operation over a full temperature range

Safe: Built-in reverse polarity protection provides enhanced circuit protection

The new Hall-effect sensors are supplied in three different magnetic sensitivities:
  • Highest sensitivity: SS341RT and SS441R devices offer the highest sensitivity of the Series, with a typical operating point of 85 G at 25 °C [77 °F]
  • Medium sensitivity: SS343RT and SS443R offer medium sensitivity with 125 G typical at 25 °C [77 °F]
  • Lowest sensitivity: SS349RT and SS449R offer the lowest sensitivity, requiring 350 G typical to operate at 25°C [77 °F]

  • Door or lid closure detection
  • Speed and RPM (revolutions per minute) sensing in fitness equipment
  • Flow rate sensing in industrial processes, appliances, or water softeners
  • Damper or valve position control in industrial, HVAC, or residential/commercial applications
  • Robotic control (cylinder position monitoring)
  • Float-based fluid level sensing
  • Printer head position sensing
  • Displacement sensor in hospital beds or medical equipment
  • Medication bin monitor on portable drug carts