Hall-effect unipolar switch with current-source output
The Texas Instruments TMAG5124G1CEDBZRQ1 is a 2-wire, high-voltage Hall-effect unipolar switch that outputs a current-source signal when a south-pole magnetic field exceeds the 11mT trip threshold. It releases at 6.8mT, providing a clean hysteresis window for reliable switching in position and proximity sensing.
The 11mT operate point and 6.8mT release point define a 4.2mT hysteresis band that prevents chatter at the switching threshold. For a procurement decision, this means the sensor is suited to applications with moderate magnetic field gradients — think ferrous-target proximity or magnet-in-plastic assemblies — rather than sub-millimeter gap sensing. The current-source output (max 7.8mA) simplifies wiring: a single pull-up resistor to the ECU's input converts the current to a voltage, and the 2-wire topology reduces harness cost.
Automotive-grade temperature and supply
The 2.7V to 38V supply range handles cold-crank dips and load-dump transients without external clamping — a genuine BOM simplification. The 18mA max supply current is typical for a 2-wire Hall switch; budget it in the module's quiescent current calculation if the sensor is always powered.
Package and footprint
Supplied in a SOT-23-3 package (TO-236-3 / SC-59 compatible), the part is a drop-in for standard three-pin Hall-switch footprints. The surface-mount package suits automated assembly and reflow soldering.
Lifecycle and compliance
It is ROHS3 compliant.