49E Hall Effect Sensor (SS49E)

The 49E Hall Effect Sensor (often referred to simply as SS49E, OH49E, or A3144-compatible) is a linear analog Hall effect sensor. It outputs a voltage that is proportional to the magnetic field strength it senses. It’s commonly used in DIY electronics, robotics, and automotive projects to detect magnetic fields and measure proximity, position, or current.

Pinout (TO-92 Package)

1 - Vcc (2.7V–6.5V)
2 - GND
3 - Vout (Analog Voltage)

Note: Always check the datasheet for exact pin configuration.

Working Principle

When no magnetic field is present, output voltage is roughly Vcc / 2.
A north pole near the sensor decreases the voltage.
A south pole near the sensor increases the voltage.
Output voltage varies linearly with magnetic field strength and polarity.

Typical Applications

• Proximity detection
• Brushless DC motor commutation
• Current sensing
• Position or rotational speed sensing
• Magnetic encoders