Melexis US5781LUA-AAA-000-CA

A unipolar Hall-effect switch designed in mixed signal CMOS technology. The device integrates a voltage regulator, Hall sensor with dynamic offset cancellation system, Schmitt trigger and an open-drain output driver, all in a single package. Thanks to its wide operating voltage range and extended choice of temperature range, it is suitable for use in automotive and solid state switch applications. The device is delivered in a Thin Small Outline Transistor (TSOT) for surface mount process and in a Plastic Single In Line (TO-92 flat) for through-hole mount. Both 3-lead packages are RoHS compliant.

Based on mixed signal CMOS technology, it is a Hall-effect device with medium magnetic sensitivity. Its sensitivity enables high accuracy in position sensing by the use of small air gap. The chopper-stabilized amplifier uses switched capacitor technique to suppress the offset generally observed with Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible and contributes to smaller chip size and lower current consumption than bipolar technology. The small chip size is also an important factor to minimize the effect of physical stress. The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using a pull-up resistor tied between a pull-up voltage and the device output.

• Wide operating voltage range from 3.5V to 24V
• Medium sensitivity
• CMOS technology
• Chopper-stabilized amplifier stage
• Low current consumption
• Open drain output
• Thin SOT23 3L and flat TO-92 3L both RoHS Compliant packages
• Unipolar magnetic switching characteristics
• UA package is south pole active
• SE package is north pole active

• Automotive, Consumer and Industrial
• Solid-state switch
• Interrupter
• Current detector
• Proximity detection