UGN3503 Linear Hall-Effect Sensor

The UGN3503 is a linear Hall-effect sensor designed to detect magnetic fields and produce a proportional analog output voltage. Its output varies linearly with magnetic flux density, making it ideal for precise magnetic field measurement across a broad range of industrial and consumer applications. Suitable for Arduino, Raspberry Pi (via external ADC), and other microcontroller-based projects, it integrates easily into electronics modules and systems.

⭐ Key Features

• Linear analog output: Voltage output changes proportionally with magnetic field strength for precise sensing.
• High sensitivity: Detects even weak magnetic fields for responsive measurement and control.
• Wide operating temperature: Reliable performance from -40°C to +85°C.
• Low current consumption: Typical supply current of ~9 mA for energy-efficient designs.
• Easy integration: Compact 3-pin device simplifies PCB layout and wiring in electronics components and modules.

🔌 Pin Configuration

• VCC (Power): Supply voltage input, typically 4.5 V to 6 V.
• GND (Ground): Ground reference for the sensor and circuit.
• VOUT (Output): Analog output voltage that varies with magnetic field strength.

🛠️ Applications

• Automotive: ABS brake systems, steering angle sensing, and general position feedback.
• Industrial control: Motor speed control, proximity detection, and position sensing.
• Consumer electronics: Magnetic cover detection in phones and tablets.
• Medical devices: Magnetic field measurement and detection applications.

⚙️ Operating Principle

The UGN3503 operates based on the Hall effect. When current flows through the sensor’s semiconductor material, an external magnetic field deflects the charge carriers, creating a transverse voltage. This Hall voltage is proportional to the magnetic field strength and is presented at VOUT as a smooth, analog voltage signal. The device’s linear response enables accurate, real-time magnetic field measurements in closed-loop control and monitoring systems.

🔧 Integration Tips for Arduino, Raspberry Pi, and Microcontrollers

• Power the sensor from a stable 5 V rail within the specified 4.5 V–6 V range.
• Read the analog output using a microcontroller ADC (e.g., Arduino). For Raspberry Pi, use an external ADC module.
• Add a local bypass capacitor (for example, 100 nF) between VCC and GND to reduce noise.
• Ensure proper magnet alignment and polarity for consistent, repeatable measurements.
• Account for sensor offset and scale during calibration to achieve optimal accuracy.

✅ Why Choose the UGN3503?

With its linear output, high sensitivity, and wide operating temperature range, the UGN3503 is a trusted choice for engineers and hobbyists who need a reliable, easy-to-integrate Hall-effect sensor for magnetic field sensing across automotive, industrial, and consumer applications.