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Overview

SS345PT Hall-effect digital position sensor IC with built-in pull-up resistor, unipolar, high sensitivity, SOT-23, pocket tape and reel, 3000 units/reel.

The SS345PT/SS445P sensor ICs are small, versatile digital Hall-effect devices that are operated by the magnetic field from a permanent magnet or an electromagnet, designed to respond to a single North pole (SS345PT) or South pole (SS445P).

These unipolar sensors are designed to meet the requirements of a wide range of potential applications. The internal pull-up resistor often eliminates the need for external components, further helping to reduce the system cost. These economical unipolar sensors are well suited for simple, high-volume, cost-sensitive position and motion sensing applications.

The 2.7 Vdc to 7 Vdc supply voltage range allows this device to be used in low voltage applications. The SS345PT’s very small size requires less PCB (printed circuit board) space, allowing it to be used in smaller assemblies.

These sensors are available in two package styles: the SS345PT in the subminiature SOT-23 surface mount package; the SS445P is available in the leaded, flat TO-92-style package.

The SS345PT is available on tape and reel (3000 units per reel); the SS445P is available in a bulk package (1000 units per bag).

SS345PT Unipolar - Honeywell


Technical Specifications

Series Name SS345PT, SS445P
Product Type Hall-effect digital position sensor IC
Magnetic Actuation Type Unipolar
Supply Voltage 2.7 Vdc to 7 Vdc
Output Voltage 0.4 Vdc max.
Supply Current 14 mA max.
Output Current 4 mA
Leakage Current 10 µA max.
Output Type Sinking
Operating Temperature -40°C to 150°C [-40°F to 302°F]
Storage Temperature -55°C to 165°C [-67°F to 329°F]
Operate Point 180 G typ. (-40°C to 150°C)
Release Point 105 G typ. (-40°C to 150°C)
Differential 75 G typ. (-40°C to 150°C)
Package Type SOT-23, pocket tape and reel, 3000 units/reel
Switching Time Rise (10 % to 90 %) 1.5 µs max.
Switching Time Fall (90 % to 10 %) 1.5 µs max.
Availability Global

Technical Specifications

Series Name SS345PT, SS445P
Product Type Hall-effect digital position sensor IC
Magnetic Actuation Type Unipolar
Supply Voltage 2.7 Vdc to 7 Vdc
Output Voltage 0.4 Vdc max.
Supply Current 14 mA max.
Output Current 4 mA
Leakage Current 10 µA max.
Output Type Sinking
Operating Temperature -40°C to 150°C [-40°F to 302°F]
Storage Temperature -55°C to 165°C [-67°F to 329°F]
Operate Point 180 G typ. (-40°C to 150°C)
Release Point 105 G typ. (-40°C to 150°C)
Differential 75 G typ. (-40°C to 150°C)
Package Type SOT-23, pocket tape and reel, 3000 units/reel
Switching Time Rise (10 % to 90 %) 1.5 µs max.
Switching Time Fall (90 % to 10 %) 1.5 µs max.
Availability Global

Documents

TITLE DOCUMENT TYPE LANGUAGE SIZE
SS345PT/SS445P Unipolar Hall-Effect Digital Position Sensor ICs With Built-in Pull-up Resistor Datasheet English 448KB
SS345PT/SS445P Unipolar Hall-Effect Digital Position Sensors with Built-in Pull-Up Resistor Installation Instructions English 269KB
SOT-23 highres photo Photo -- 471KB
SOT-23 lowres photo Photo -- 59KB
Magnetic Sensor IC SOT-23 CAD Model CAD Model -- 84KB
Position Sensors Range Guide Product Range Guide English 1MB
Magnetic Sensors Line Guide Product Line Guide English 377KB
Magnetic Sensor IC Product Line Card Line Card/Selection Chart English 495KB
Magnetic Sensor IC Selection Chart Line Card/Selection Chart English 190KB

Product Features

  • Subminiature package size (SS345PT) uses less space on the PCB than standard Hall-effect sensor packages such as TO-92 or SOT-89, allowing for use in smaller assemblies
  • Tape and reel packaging (SS345PT) allows for automated component placement, helping to reduce manufacturing costs
  • Small, flat TO-92-style package (SS445P) is also available
  • Simple activation from a North pole (SS345PT) or a South pole (SS445P) makes these products suitable in a variety of potential applications such as motion control, lid closure detection, and displacement sensing
  • Built-in pull-up resistor can easily interface with common electronic circuits without adding external components, helping to reduce total system cost
  • RoHS-compliant materials meet Directive 2002/95/EC

Applications

    Commercial:
  • 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
  • Printer head position sensing
    Industrial
  • Flow rate sensing in industrial processes
  • Robotic control (cylinder position monitoring)
  • Float-based fluid level sensing
    Medical
  • Displacement sensor in hospital beds and medical equipment
  • Medication bin monitor on portable drug carts

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