DESCRIPTION

The SS351AT and SS451A sensors are small, versatile digital

Hall-effect devices that are operated by the magnetic field from

a permanent magnet or an electromagnet. They are designed

to respond to a either a North pole or a South pole.

These omnipolar sensors are sensitive and flexible devices

designed to meet a wide range of potential applications. The

SS351AT and SS451A have a typical operating point of 85 G

at 25 °C [77 °F]. Because they can be operated by a North

pole or a South pole, they do not require the magnet polarity to

be identified, thus making the installation easier and potentially

reducing the system cost.

These sensors are available in two package styles. The

SS351AT is available in the subminiature SOT-23 surface

mount package; the SS451A is available in the leaded, flat TO-

92-style package.

The SS351AT’s small size requires less PC

board space, allowing it to be used in smaller assemblies. Its

3 Vdc capability allows for use in low voltage applications,

promoting energy efficiency.

The SS351AT is available on tape and reel (3000 units per

reel); the SS451A is available in a bulk package (1000 units

per bag).

FEATURES

Subminiature package size (SS351AT) supplied on tape

and reel allows for a compact design with automated

component placement, helping to reduce manufacturing

costs

Simple activation from a North pole or a South pole and

sensitive magnetics make this omnipolar product suitable

in a variety of potential motion control, lid closure

detection, and displacement sensing applications

Low voltage 3 Vdc capability helps reduce power

consumption

Built-in reverse polarity protection protects the device from

potential damage during installation

Thermally balanced integrated circuit provides for stable

operation over a wide temperature range of -40° to

150 °C [-40 °F to 302 °F]

RoHS-compliant materials meet Directive 2002/95/EC

POTENTIAL APPLICATIONS

Commercial:

Speed and RPM (revolutions per minute) sensing in

fitness equipment

Magnetic encoder for building access

Damper or valve position control in HVAC (heating,

ventilation and air conditioning) equipment

Flow rate sensing in appliances and water softeners

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