S41 Bipolar Hall Effect Position Sensors

S41 Hall Effect Position Sensor is a solid-state magnetic sensor designed for precise position sensing in automation, automotive, and industrial applications. It operates on a BJT switch principle—turning on in the presence of a strong south magnetic field and turning off with a strong north magnetic field. Its compact TO-92S package and high sensitivity make it ideal for use in harsh and space-constrained environments.

Key Features:

• BJT Magnetic Sensing: Switches output based on magnetic polarity—ideal for speed and direction detection.
• Digital Output: Provides a clean on/off signal for microcontroller interfacing.
• Low Power Consumption: Efficient CMOS design suitable for battery-operated devices.
• High Sensitivity: Detects low magnetic field strengths with precision.
• Wide Operating Voltage Range: Works from 3.5V to 20V DC.

Technical Specifications:

• Operating Voltage: 3.5V to 20V DC
• Output Type: Open-collector digital output
• Magnetic Polarity Detection: BJT (requires alternating N/S field to toggle output)
• Output Current: 20mA max sink current
• Operating Frequency: Up to 10 kHz
• Output Voltage: < 0.4V when active at 20mA
• Power Consumption: Less than 10mW in typical operation

Mechanical Specifications:

• Package Type: TO-92S (3-pin transistor style)
• Lead Configuration: Vcc, GND, Output
• Dimensions: Approx. 4.0mm × 3.0mm × 1.5mm (body)
• Encapsulation: Molded plastic for environmental protection

Pinout and Wiring:

• Pin 1: Vcc (Supply voltage)
• Pin 2: GND (Ground)
• Pin 3: OUT (Digital signal output)
• Wiring: Connect output to microcontroller input pin via pull-up resistor

Datasheet and Documentation:

• Download S41 BJT Hall Effect Sensor Datasheet (PDF)

Applications:

• Rotational Speed Detection: Sensing gear or shaft speed in motors or fans.
• Linear Position Sensing: Detecting sliding or actuating mechanisms.
• Magnetic Switches: Contactless switching in door and lid detection.
• Automotive Systems: Used for crankshaft or camshaft position sensing.
• Industrial Automation: Precision control in assembly and conveyor systems.

Equivalent Models:

• SS495B: Analog Hall sensor with similar sensing behavior
• OH090U: Digital switch sensor alternative
• UGN3175: Popular Hall switch from Allegro

Package Includes:

• 1 x S41 Hall Effect Position Sensor (TO-92S)