A3144 Hall Effect Sensor-EE548-P7

The A3144 is an integrated Hall Effect latched sensor. That's nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size. A Hall Effect sensor is much smaller, but can handle less current than a reed switch. The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide switching hysteresis for noise rejection, and open-collector output. An internal band gap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range. If a magnetic flux density larger than threshold Bop, DO is turned on (low). The output state is held until a magnetic flux density reversal falls below Brp causing DO to be turned off (high).

Specifications

·        Superior Temp. Stability for Automotive or Industrial Applications

·        4.5 V to 24 V Operations ... Needs Only An Unregulated Supply

·        Open-Collector 25 mA Output ... Compatible with Digital Logic

·        Reverse Battery Protection

·        Activate with Small, Commercially Available Permanent Magnets

·        Solid-State Reliability

·        Small Size

·        Resistant to Physical Stress 

·        Detector type: Magnetic Sensing Hall effect

·        Detecting range: 7 mm

·        Size(LxWxH):4x1.5x17.4mm

·        Weight:0.11g.

Applications

·        Tachometer

·        Speed Detecting of fan and motors.