49E linear Hall effect sensor, TO-92 package marked 49E 5018G, front view

49E Linear Hall Effect Sensor - TO-92, 3V to 6.5V

$0.59 NZD
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49E linear Hall effect sensor, TO-92 package marked 49E 5018G, front view
  • 49E linear Hall effect sensor, TO-92 package marked 49E 5018G, front view
  • Close-up of the 49E Hall sensor marked face showing 49E and 5018G
  • 49E Hall sensor on a breadboard with an Arduino Nano and a magnet held near the sensor
  • 49E linear Hall sensor pinout: pin 1 VCC 3.0V to 6.5V, pin 2 GND, pin 3 analogue VOUT; a south pole raises VOUT and a north pole lowers it
  • 49E Hall sensor size compared with a New Zealand one-dollar coin and a ballpoint pen tip
  • 49E Hall sensor dimensions: 4.0mm wide, 3.0mm high and 1.5mm thick body, 1.27mm pin pitch, leads 14mm or longer
49E Linear Hall Effect Sensor - TO-92, 3V to 6.5V
SKU: 49E-HALL-TO92

49E Linear Hall Effect Sensor - TO-92, 3V to 6.5V

$0.59 NZD
5.0 1 review
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Minimum order quantity: 5

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The 49E is a linear Hall effect sensor in a small three-pin TO-92 package. Its output voltage follows the magnetic field around it: with no magnet nearby it sits at half the supply, a south pole facing the printed side raises it and a north pole lowers it. It runs from 3.0V to 6.5V, so it connects straight to an analogue pin on a 5V Arduino or a 3.3V ESP32 with no extra parts.

Specifications

Model49E, marked 49E 5018G
Sensor typeLinear ratiometric Hall effect
Supply voltage3.0V to 6.5V DC
Supply current6 to 10mA typical
Output typeAnalogue voltage
Output with no magnetHalf the supply (2.5V on 5V, 1.65V on 3.3V)
Sensitivity1.0 to 1.75mV/G (1.4mV/G typical at 5V)
Linear rangeAbout +/-650G
Output swingAbout 1V to supply minus 1V
Output current1.5mA max, source or sink
Response time3us (DC to 20kHz)
Operating temperature-40°C to +85°C
PackageTO-92UA, 3 pins, about 4 x 3 x 1.5mm
PinoutPrinted side facing you, legs down: 1 VCC, 2 GND, 3 OUT
SKU49E-HALL-TO92

Datasheets

Full technical datasheet PDF

Try it: move a magnet past the sensor

What's in the box

5+
49E linear Hall effect sensors, TO-92

Minimum order of 5, then any quantity you like. Supplied loose in an antistatic bag.

Great for

Measuring how close a magnet is to the sensor
A contactless throttle, trigger or joystick axis
Telling the north and south poles of a magnet apart
Lid, door or end-stop position using a small magnet
Fan or wheel speed with a magnet on the rotor
Learning analogue inputs on Arduino and ESP32

Wiring & getting started

  1. Hold it printed side facing you, legs down

    The pins run left to right: 1 is VCC, 2 is GND and 3 is OUT.

  2. Power it from the same rail your ADC uses

    Use the 5V pin on an Arduino or 3.3V on an ESP32. The output scales with the supply, so matching rails keeps readings steady.

  3. Connect OUT to an analogue input

    Use A0 on an Arduino or any ADC pin on an ESP32. No pull-up resistor is needed. A 0.1uF capacitor across VCC and GND at the sensor helps on a noisy supply.

  4. Read it and note the value with no magnet

    analogRead(A0) gives about 512 on a 5V Arduino. That is your zero: higher readings mean a south pole, lower readings a north pole.

  5. Convert to gauss if you need real units

    G = (counts - zero) * (5.0 / 1023) * 1000 / 1.4 on a 5V Arduino. The datasheet above has a full example sketch, and our linear Hall sensor guide covers ESP32 wiring, distance measurement and a contactless throttle.

Note: Aim the magnet at the flat printed side of the sensor. From behind, the reading is weaker and the direction appears reversed.
Related guide Hall Effect Sensors Explained: Switch vs Latch vs LinearSwitch, latch or linear? A plain-English guide to picking the right hall effect sensor for your Arduino or ESP32 project, with wiring, code, and fixes for th...
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andy81
Trade Me feedback

Excellent products at great prices, and very fast delivery. Thanks for a great deal!

Frequently Asked Questions

Answers to the questions buyers ask most.

Is the 49E analogue or a simple on/off switch?
Analogue. It puts out a continuous voltage that moves with field strength, so you can measure how strong a magnet is and which pole is facing it. If you only need on/off, use a Hall switch like the A3144 instead.
What does it read with no magnet nearby?
Half the supply voltage, so about 2.5V on a 5V supply or 1.65V on 3.3V. That works out to roughly 512 counts on an Arduino analogRead. Take that idle figure as your zero and measure the swing either side of it.
How do I turn the reading into gauss?
Subtract your idle reading and divide by the sensitivity: G = (counts - zero) x (Vcc / 1023) x 1000 / 1.4, using 1.4mV per gauss as the typical figure at 5V. Positive is a south pole, negative is a north pole. The datasheet PDF on this page has the full Arduino sketch.
Does it work on an ESP32 or Raspberry Pi?
Yes on an ESP32: power it from 3.3V, read any ADC pin, and remember the idle point is now about 1.65V and the sensitivity about 0.9mV per gauss. A Raspberry Pi has no analogue inputs, so it needs an external ADC such as an MCP3008.
Which side is the sensing face?
The flat printed face of the TO-92 body. Point that at the magnet for the strongest reading.
Why does my reading drift?
The output is ratiometric, meaning both the idle point and the sensitivity scale with the supply. Power the sensor from the same rail your ADC references and the drift cancels out. A 0.1uF capacitor across VCC and GND at the sensor also helps on noisy supplies.

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