A3144 Digital Unipolar Hall-effect Sensor TO-92

A3144 Digital Unipolar Hall-effect Sensor TO-92 is a magnetic sensor that detects the presence of a magnetic field and outputs a digital signal. It is widely used in contactless switching, speed sensing, RPM measurement, and proximity detection applications. The TO-92 package makes it easy to integrate into breadboards and PCBs for embedded systems.

Key Features:

• Digital Output: Produces a clear HIGH or LOW output based on magnetic field presence.
• Unipolar Type: Responds only to one magnetic polarity (typically South pole).
• Built-in Pull-up Resistor: Simplifies circuit design and reduces external components.
• Wide Operating Voltage: Operates between 4.5V to 24V DC.
• Fast Switching: Quick response time for real-time magnetic sensing.

Technical Specifications:

• Operating Voltage: 4.5V to 24V DC
• Output Type: Digital (open collector)
• Magnetic Sensitivity: Typically 85 Gauss for operate, 60 Gauss for release
• Output Current: Max 25mA
• Operating Temperature Range: -40°C to +85°C
• Response Time: < 1 µs
• Power Consumption: Low static current draw

Mechanical Specifications:

• Package Type: TO-92
• Pin Count: 3 pins
• Pin Configuration: Pin 1 (VCC), Pin 2 (GND), Pin 3 (OUT)
• Mounting Type: Through-hole
• Lead Length: Approx. 11mm

Pinout and Wiring:

• Pin 1 (VCC): Connect to 5V or 3.3V supply
• Pin 2 (GND): Connect to ground
• Pin 3 (OUT): Digital signal output; LOW when magnet is detected

Datasheet and Documentation:

• Download A3144 Hall-effect Sensor Datasheet (PDF)

Applications:

• Speed Sensors: Used in RPM counters and fan speed detection circuits.
• Position Sensing: Detects the position of moving magnetic objects.
• Door Sensors: Used in security and automation systems for magnetic door detection.
• Brushless DC Motors: Senses rotor position for commutation.
• Proximity Sensors: Triggers logic-level signal based on magnet approach.

Equivalent Models:

• OH3144: Compatible unipolar Hall-effect sensor
• SS41: Honeywell alternative with similar specs
• 44E: General-purpose Hall-effect sensor with TO-92 casing

Package Includes:

• 1 x A3144 Digital Unipolar Hall-effect Sensor TO-92