1 Features and Benefits
△ Digital output, omnipolar switch
△ Quickly respond to changes in magnetic field
△ Wide operating voltage range: 2.5V ~ 22V
△ Strong resistance to mechanical stress
△ Non-contact output, safety and reliable
△ Operating temperature range: -40ºC ~ 125ºC
△ TO-92 and SOT-23-3L package options
△ Developed according to the EU RoHS and EU REACH

2 Application Examples
△ Automotive electronics, Consumer electronics and Industrial electronics
△ Water flow sensing
△ Liquid level detection
△ Position sensing
△ Hand-held equipment (Cellphone, Pan-Tilt, Notebook, etc.)
△ Contactless key/button
△ Bluetooth headset
△ Door latch system

The AH3931 is a digital omnipolar Hall switch. The device includes a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short circuit protected open-drain output to sink up to 25 mA. An on-board regulator permits operation with supply voltages of 2.5 to 22 V. The advantage of operating down to 2.5V is that the device can used in 2.5V applications or with additional external resistance in series with the supply pin for greater protection against high-voltage transient events.
The AH3931, produced with CMOS technology, is asked for lower supply voltage and less power supply. It is available in two package types: SOT-23-3L (Type M), and TO-92 (Type UA). Each package is lead (Pb) free, with 100% matte tin plated leadframes.