Digital Position Sensors feature built-in pull-up resistor.

Press Release Summary:

Model SS345PT Unipolar Hall-effect Digital Position Sensors respond to single north pole while SS445P units respond to single south pole. Both sensors include open collector output with built-in pull-up resistor that interfaces with common electronic circuits. Operating from 2.7-7 Vdc supply, they are operated by magnetic field from permanent magnet or electromagnet. Products are suited for commercial, industrial, and medical applications.

Original Press Release:

Honeywell's Unipolar Hall-Effect Digital Position Sensors with Built-In Pull-Up Resistor Help Reduce Total System Costs

SS345PT and SS445P are Price Competitive, Offer a Subminiature Package, and Operate from a Voltage as Low as 2.7 Vdc

MINNEAPOLIS - Honeywell (NYSE: HON) today announced two new Hall-effect digital position sensors - the SS345PT and SS445P Unipolar Hall-effect Digital Position Sensors - that reduce total system cost for customers by having built-in pull-up resistors, eliminating the need for customers to purchase an external pull-up resistor.

As unipolar devices, the new sensors respond to either a North pole or a South pole, depending upon the sensor. The SS345PT responds to a single North pole; the SS445P responds to a single South pole. The open collector output with built-in pull-up resistor easily interfaces with common electronic circuits.

Honeywell has also downsized the sensor's integrated circuit, saving on manufacturing costs while still meeting customer requirements. These manufacturing cost savings result in lower costs to customers. The low 2.7 Vdc to 7 Vdc low supply voltage range allows for use in a variety of applications.

The SS345PT's subminiature SOT-23 surface mount package uses less space on the printed circuit board than standard Hall-effect sensor packages such as TO-92 or SOT-89, allowing for use in smaller assemblies. Additionally, the SS345PT is supplied on tape and reel, allowing for automated, lower-cost pick and place assembly which can help reduce manufacturing costs. The SS445P's leaded, flat TO-92 package is available in bulk packaging (1000 units per bag).

These small, versatile Hall-effect devices are operated by the magnetic field from a permanent magnet or an electromagnet. Both sensors feature enhanced sensitivity which allows for the use of smaller, often less expensive magnets.

Designed for high-volume, cost-sensitive position and motion sensing applications, the SS345PT and SS445P may be used in commercial, industrial, and medical applications. Potential commercial applications include door or lid closure detection in appliances, speed and RPM sensing in fitness equipment, flow rate sensing in appliances and water softeners, damper or valve position control in HVAC equipment, and printer head position sensing. Potential industrial applications include flow rate sensing in industrial processes, robot control (cylinder position monitoring), and float-based fluid level sensing. Potential medical applications include displacement sensing in hospital beds and medical equipment, and medication bin monitors on portable drug carts.

Honeywell International ( is a Fortune 100 diversified technology and manufacturing leader, serving customers worldwide with aerospace products and services; control technologies for buildings, homes and industry; automotive products; turbochargers; and specialty materials. Based in Morris Township, N.J., Honeywell's shares are traded on the New York, London, and Chicago Stock Exchanges. For more news and information on Honeywell, please visit


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