SS345PT/SS445P DESCRIPTION The 2.7 Vdc to 7 Vdc supply voltage range allows this device The SS345PT/SS445P sensors are small, versatile digital Hall- to be used in low voltage applications. The SS345PTs very effect devices that are operated by the magnetic field from a small size requires less PCB (printed circuit board) space, permanent magnet or an electromagnet, designed to respond allowing it to be used in smaller assemblies. to a single North pole (SS345PT) or South pole (SS445P). These sensors are available in two package styles: the These unipolar sensors are designed to meet the requirements SS345PT in the subminiature SOT-23 surface mount package of a wide range of potential applications. The internal pull-up the SS445P is available in the leaded, flat TO-92-style resistor often eliminates the need for external components, package. further helping to reduce the system cost. These economical The SS345PT is available on tape and reel (3000 units per unipolar sensors are well suited for simple, high-volume, cost- reel) the SS445P is available in a bulk package (1000 units sensitive position and motion sensing applications. per bag). FEATURES POTENTIAL APPLICATIONS Commercial: Subminiature package size (SS345PT) uses less space on Door or lid closure detection in appliances the PCB than standard Hall-effect sensor packages such as Speed and RPM sensing in fitness equipment TO-92 or SOT-89, allowing for use in smaller assemblies Flow rate sensing in appliances and water softeners Tape and reel packaging (SS345PT) allows for automated Damper or valve position control in HVAC equipment component placement, helping to reduce manufacturing Printer head position sensing costs Industrial Small, flat TO-92-style package (SS445P) is also available Flow rate sensing in industrial processes Simple activation from a North pole (SS345PT) or a South Robotic control (cylinder position monitoring) pole (SS445P) makes these products suitable in a variety Float-based fluid level sensing of potential applications such as motion control, lid closure Medical detection, and displacement sensing Displacement sensor in hospital beds and medical Built-in pull-up resistor can easily interface with common equipment electronic circuits without adding external components, Medication bin monitor on portable drug carts helping to reduce total system cost RoHS-compliant materials meet Directive 2002/95/EC SS345PT/SS445P Table 1. SS345PT/SS445P Specifications (At 2.7 to 7 Vdc supply, 4 mA load, T = -40 C to 150 C -40 F to 302 F A Characteristic Condition Minimum Typical Maximum Unit Supply voltage -40 C to 150 C -40 F to 302 F 2.7 5.0 7.0 Vdc Supply current G < 25 , Vs = 5 V, 25 C 77F 5.5 mA -40 C to 150 C -40 F to 302 F 14 Output current 4.0 mA Vsat G > 260 0.4 Vdc Output leakage current G < 25 10 A Output rise time 1.5 25 C 77 F s Output fall time 1.5 Thermal resistance: 303 SS345PT C/W 233 SS445P -40 C to 150 C -40 F to 302 F 55 180 280 Operate G Release -40 C to 150 C -40 F to 302 F 25 105 240 G Differential -40 C to 150 C -40 F to 302 F 10 75 140 G Operating temperature -40 -40 150 302 C F Storage temperature -55 -67 165 329 C F NOTICE The magnetic field strength required to cause the switch to change state (operate and release) will be as specified in the magnetic characteristics. To test the switch against the specified magnetic characteristics, the switch must be placed in a uniform magnetic field. 1 Table 2. SS345PT/SS445P Absolute Maximum Ratings Characteristic Minimum Typical Maximum Unit Supply voltage -0.5 7.0 V Applied output voltage -0.5 7.0 V Output current 8.0 mA Magnetic flux no limit G Note 1: Absolute maximum ratings are the extreme limits that the device will withstand without damage to the device. However, the electrical and mechanical characteristics are not guaranteed as the maximum limits (above recommended operating conditions) are approached, nor will the device necessarily operate at absolute maximum ratings. Figure 1. SS345PT/SS445P Current Sinking Output Block Figure 2. Typical SS345PT/SS445P Magnetic Diagram Performance vs Temperature 2 www.honeywell.com/sensing