Silicon Labs Surface Mount Hall Effect Sensor, SOT-23, 3-Pin

The Si7201-21-IV , Omnipolar Switch Magnetic Sensor is designed to simplify magnetic switch/latch needs. The low power and high sensitivity of this device make it ideally suited for many applications. The Si7201-21-IV supports a wide temperature range of -40 to +125 °C.

Applications:
Replacement of reed switches in consumer, and security applications
Position sensing of HVAC knob, door locks, windows, and other mechanical devices
BLDC motor control
Camera image stabilization, zoom, and autofocus
Fluid level sensing
Control knobs and selector switches
General-purpose mechanical position sensing