1.65 V supply, ±30 mT operate — low-voltage omnipolar Hall switch
The BU52078GWZ-E2: The ROHM BU52078GWZ- is an omnipolar Hall-effect switch that detects both north and south magnetic poles with a single device, outputting a CMOS-level signal when the field exceeds ±30 mT (typical operate point) and releasing at ±16.4 mT (typical release point). It runs from a 1.65 V supply rail — low enough for battery-powered or 1.8 V logic systems — and draws negligible quiescent current, though the exact supply current figure is not listed here.
Surface-mount package and CMOS output
The output current is rated at 0.5 mA maximum, so the load should be a high-impedance CMOS gate input rather than a relay coil or LED.