SS311PT/SS411P Bipolar Hall-effect Digital Position Sensors with Built-in Pull-up Resistor DESCRIPTION The 2.7 Vdc to 7 Vdc supply voltage range allows this device The SS311PT/SS411P sensors are small, versatile digital Hall- to be used in low voltage applications. The S311PT’s 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 alternating North and South poles. These sensors are available in two package styles: the These bipolar sensors have enhanced sensitivity which allows SS311PT in the subminiature SOT-23 surface mount package for the use of smaller, often less expensive magnets. The and the SS411P in the leaded, flat TO-92-style package. internal pull-up resistor often eliminates the need for external The SS311PT is available on tape and reel (3000 units per components, further helping to reduce system cost. These reel); the SS411P is available in a bulk package (1000 units economical bipolar sensors are suited for many simple, high- per bag). volume, cost-sensitive, rotary sensing applications. FEATURES POTENTIAL APPLICATIONS Transportation: • Subminiature, SOT-23 surface mount package (SS311PT) • Speed and RPM (revolutions per minute) sensing supplied on tape and reel allows for a compact design with • Tachometer, counter pickup automated component placement, helping to reduce • Motor and fan control manufacturing costs • Brushless dc motor control • Small, leaded, flat TO-92 package (SS411P) often allows for more space on the PCB Industrial and Commercial: • Sensitive, bipolar magnetics respond to alternating North • Speed and RPM (revolutions per minute) sensing and South poles, making these products suited for speed • Tachometer, counter pickup sensing and RPM measurement • Flow-rate sensing • Built-in pull-up resistor can easily interface with common • Brushless dc (direct current) motor commutation electronic circuits without adding external components, • Motor and fan control helping to reduce total system cost • Robotics control • RoHS-compliant materials meet Directive 002/95/EC SS311PT/SS411P Table 1. SS311PT/SS411P Specifications (At 2.7 Vdc to 7 Vdc supply, 4 mA load, T = -40 ºC to 150 ºC [-40 ºF to 302 ºF] 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 gauss <-140, Vs = 5 V, 25 °C [77°F] – 5.5 – mA -40 °C to 150 °C [-40 °F to 302 °F] – – 14 Output current – – – 4.0 mA Vsat gauss >140 – – 0.4 V Output leakage current gauss <-140 – – 10 µA Output rise time – – 1.5 25 °C [77 °F] µs Output fall time – – 1.5 Thermal resistance: SS311PT – – 303 – °C/W SS411P – – 233 – Operate -40 °C to 150 °C [-40 °F to 302 °F] -30 55 140 gauss Release -40 °C to 150 °C [-40 °F to 302 °F] -140 -55 30 gauss Differential -40 °C to 150 °C [-40 °F to 302 °F] 40 – – gauss Operating temperature – -40 [-40] – 150 [302] °C [°F] Storage temperature – -40 [-40] – 150 [302] °C [°F] NOTICE Bipolar Hall-effect sensors may have an initial output in either the ON or OFF state if powered up with an applied magnetic field in the differential zone (applied magnetic field >Brp and