DESCRIPTION
The SS345PT/SS445P sensors 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).
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
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
