AH3503 Linear Hall Effect Sensor TO-92

AH3503 Linear Hall Effect Sensor TO-92UA is a versatile, high-accuracy device that produces an output voltage directly proportional to the magnetic field strength passing through its sensing area. Unlike digital Hall sensors that only provide on/off switching, the AH3503 offers an analog output, allowing microcontrollers to measure the precise position, current, or motion of an object. This sensor features integrated voltage regulation and temperature compensation, ensuring stable and reliable performance across its entire operating range. Therefore, designers rely on the AH3503 for non-contact, high-resolution magnetic sensing in demanding industrial and consumer electronic environments. Furthermore, its small TO-92UA package makes integration into compact circuit boards straightforward.

Key Features:

• Ratiometric Linear Output: The output voltage changes linearly with the applied magnetic field, scaling proportionally with the supply voltage (V_CC).
• Quiescent Output Voltage: The sensor produces a quiescent output voltage (V_Q) typically equal to half the supply voltage (V_CC/2) when no magnetic field is present.
• Wide Operating Voltage: Supports a broad supply voltage range, making it highly compatible with 5 V and 3.3 V microcontroller systems.
• Temperature Stability: Features integrated temperature compensation, which minimizes sensitivity drift across the operating temperature range.
• Solid State Reliability: Operates using the Hall effect principle, providing non-contact sensing with high durability and long operational life compared to mechanical switches.

Technical Specifications:

• Supply Voltage Range (V_CC): 4.5 V to 6.0 V
• Output Type: Ratiometric Linear Voltage
• Quiescent Output Voltage (V_Q): V_CC / 2 (Typically 2.5 V at V_CC = 5 V)
• Sensitivity (S): Typically 2.5 mV/Gauss (or 50 mV/mT)
• Output Current Capability: 10 mA max sink or source
• Operating Temperature Range: −40°C to +85°C
• Bandwidth: Typically 20 kHz

Mechanical Specifications:

• Package Style: TO-92UA (Flat side for orientation)
• Mounting: Through-Hole Technology (THT)
• Pin Count: 3 Pins
• Sensing Location: The active sensing area is centered between the molded faces, nearest the top of the package.

Dimensions:

• Body Length: ≈ 4.4 mm
• Body Width: ≈ 3.0 mm
• Body Thickness: ≈ 1.5 mm
• Pin Pitch: 1.27 mm (Half-pitch spacing compared to standard TO-92)
• Lead Length: ≈ 14 mm (Can be bent for application)

Pinout and Wiring:

• Pin 1 (VCC): Connect to the positive supply voltage (4.5 V to 6.0 V).
• Pin 2 (GND): Connect to the circuit ground reference (0 V).
• Pin 3 (VOUT): This is the Analog Output pin. Connect it directly to an Analog-to-Digital Converter (ADC) input on your microcontroller.
• Wiring Note: Always decouple the VCC pin with a bypass capacitor (≈ 0.1 μF) placed close to the sensor pins to ensure stable operation and minimize power supply noise.[Image of AH3503 Hall Sensor Pinout and Basic Wiring Diagram]

Datasheet Reference:

• Download AH3503 Equivalent Linear Hall Sensor Datasheet

Commonly Used in:

• Motor Control: Sensing rotor position or speed in brushless DC (BLDC) motors or stepper motor control systems.
• Current Sensing: Measuring DC current non-invasively by sensing the magnetic field produced by the current flow through a conductor (requires a flux concentrator).
• Industrial Automation: Used in linear position transducers and fluid level sensing.

Applications:

• Joystick and Throttle Control: Providing proportional position feedback for gaming peripherals and motor controls.
• Contactless Potentiometers: Replacing traditional mechanical potentiometers for improved durability and accuracy in volume or dimmer controls.
• Magnetic Field Detection: Accurately measuring the strength of magnetic fields in scientific and testing equipment.
• Fluid Level Sensing: Tracking the vertical position of a magnetic float in a liquid container.

Equivalent Models:

• A1302 (Allegro MicroSystems): A direct functional equivalent linear Hall-effect sensor with similar voltage and sensitivity specifications.
• SS495A (Honeywell): A highly popular linear sensor family that offers very close performance metrics to the AH3503.
• KY-024 Module: This module often integrates the AH3503 or an equivalent linear Hall sensor onto a small breakout board.

Package Includes:

• 1 x AH3503 Linear Hall Effect Sensor TO-92