WSH49E Linear Hall Effect Sensor TO-92S

WSH49E Linear Hall Effect Sensor TO-92S delivers a proportional analog output voltage corresponding directly to the intensity of a perpendicular magnetic field, making it an ideal device for precise contactless sensing. This low-power, single-output sensor integrates a Hall sensing element, a linear amplifier, and a temperature compensation circuit onto a single silicon chip. Consequently, the WSH49E ensures highly accurate magnetic field measurement across a wide temperature range. Furthermore, its small, through-hole TO-92S package simplifies mounting into various printed circuit boards. Engineers often select this linear Hall sensor to measure current, detect position, or determine rotary movement because of its high sensitivity and reliable performance.

Key Features:

• Linear Output: The sensor produces a voltage output that is directly proportional to the magnetic field strength (Gauss), centered around V_CC/2.
• High Sensitivity: Offers high sensitivity, allowing it to detect even small changes in the magnetic field, which is essential for current sensing applications.
• Wide Operating Voltage: Operates efficiently across a supply voltage range of 2.7 V to 6.5 V, supporting both 3.3V and 5V systems.
• Quiescent Output Voltage: Sets the zero-field output voltage at V_CC/2 (≈ 2.5 V at 5 V supply) for bi-polar magnetic field detection.
• Temperature Stability: Integrates sophisticated temperature compensation that maintains output stability across the entire operating range.
• TO-92S Package: Uses the compact, flat TO-92S (S=Small/Slim) through-hole package for easy assembly.

Technical Specifications:

• Supply Voltage Range (V_CC): 2.7 V to 6.5 V
• Quiescent Output Voltage (V_Q): V_CC / 2 ± 0.1 V typical
• Sensitivity: Typically 1.3 mV/Gauss (≈ 13 mV/mT)
• Output Current: ±5 mA maximum (Sink/Source)
• Magnetic Field Range: ±800 Gauss (Typical linear operating range)
• Operating Temperature Range: −40°C to +125°C (Industrial Grade)

Mechanical Specifications:

• Package Type: TO-92S (Miniature, Flat Transistor Style)
• Mounting: Through-Hole Technology (THT)
• Sensing Direction: Perpendicular to the flat face of the package.
• Material: Epoxy Mold Compound

Dimensions:

• Body Height: ≈ 4.0 mm
• Body Width (Flat Side): ≈ 3.0 mm
• Body Thickness: ≈ 1.5 mm
• Pin Pitch: 1.27 mm (Half standard THT spacing)
• Weight: < 0.2 g (Extremely light)

Pinout and Wiring:

• Pin 1 (V_CC): Connect to the positive supply voltage (2.7 V to 6.5 V).
• Pin 2 (GND): Connect to the circuit ground (0 V).
• Pin 3 (V_OUT): This pin provides the analog output voltage (V_CC/2 when no field is present).
• Wiring Note: Therefore, always connect a small decoupling capacitor (e.g., 0.1 μF) between Pin 1 (V_CC) and Pin 2 (GND) to stabilize the supply voltage and minimize noise.

Datasheet Reference:

• Download WSH49E Linear Hall Sensor Datasheet

Commonly Used in:

• Industrial Position Sensing: Detecting the start/end position of cylinders, actuators, and mechanical limit switches.
• Non-Contact Current Measurement: Measuring AC or DC current by placing the sensor near a current-carrying conductor or utilizing a magnetic core.
• Motor Control Feedback: Sensing rotor position or speed in brushless DC (BLDC) motors and encoders.

Applications:

• Joysticks and Pedals: Providing linear position feedback in gaming controllers and industrial equipment.
• Fluid Level Sensing: Monitoring liquid levels using a float that incorporates a magnet.
• Magnetic Encoders: Developing robust, non-optical rotary and linear position encoders.
• Security Systems: Detecting the opening of doors and windows (often in conjunction with a magnet).

Equivalent Models:

• Allegro A1302: A popular, comparable linear Hall sensor offering similar sensitivity and features.
• Honeywell SS49E: This is a widely referenced equivalent model that shares the same functional and pinout characteristics.
• 49E (Generic): The generic designation for this class of linear Hall sensor, hence many manufacturers produce functionally identical parts.

Package Includes:

• 1 x WSH49E Linear Hall Effect Sensor TO-92S