South-pole unipolar switch with a 2.7 V rail and 150°C ceiling
The TMAG5124H1CEDBZRQ1 is a unipolar Hall-effect switch from Texas Instruments that responds only to a south-pole magnetic field, switching on at 16.1 mT and releasing at 11.4 mT. It operates from a 2.7 V supply and draws 18 mA typical, with an output current capability of 7.8 mA max — sized for direct drive of a downstream logic input or indicator LED without an external buffer. The -40°C to 150°C ambient temperature range and AEC-Q qualification (implied by automotive designation) make it suitable for engine-bay or transmission-mounted position sensing where the board sees sustained heat and vibration.
Current-source output — what it means for the load
A current-source output delivers a constant current proportional to the field state, rather than a voltage swing — this gives noise immunity over long harness runs because the signal is a current loop, not a voltage referenced to ground. The 7.8 mA max output current means the switch can sink a standard PLC digital input or a 5 V logic gate directly; the 18 mA supply current is the total budget for the device plus the load, so the system designer must account for the load draw when sizing the 2.7 V rail.