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The A3144 is an integrated Hall effect latched sensor. That’s nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size. A hall effec..

    IC, HALL EFFECT SENSOR, BIPOLAR, TO-92-3     Hall Effect Type: Bipolar     Output Current: 20mA     Sensor Case Style: TO-92     No. of Pins: 3     Supply Voltage Min: 3V     Supply Vol..