ACS712 5A Range Hall Effect Current Sensor Module (Model: 05B) – High Precision AC/DC Current Detection Board

Description

The ACS712 5A Current Sensor Module is built around the Allegro ACS712ELCTR-05B Hall-effect current sensor IC, providing isolated, bidirectional AC/DC current measurement up to ±5A. Unlike shunt-based solutions, the ACS712 uses Hall-effect sensing to measure current without direct electrical contact between the current path and the sensor electronics, offering galvanic isolation and minimal power loss (internal conductor resistance of only 1.2 mΩ) . The module outputs an analog voltage proportional to the measured current, centered at VCC/2 (typically 2.5V) when no current flows, with a sensitivity of 185 mV/A . The board includes screw terminals for the current-carrying circuit and a 3-pin header for VCC, GND, and analog output, making it directly compatible with Arduino, ESP32, and other microcontroller platforms. It is suitable for individual makers building power monitors or overcurrent protection circuits, as well as business purchasers seeking a cost-effective, isolated current sensing solution for equipment diagnostics, battery chargers, and switching power supplies.

Features

• Bidirectional AC/DC Measurement: Measures current in both directions across a ±5A range, suitable for AC and DC applications .

• Hall-Effect Isolation: Provides galvanic isolation between the current path and sensor electronics, enhancing safety and reducing interference .

• Analog Voltage Output: Outputs a linear analog signal (185 mV/A) readable by any microcontroller with an ADC .

• Low Insertion Loss: Internal conductor resistance of 1.2 mΩ minimizes voltage drop and power dissipation in the measured circuit .

• Screw Terminal Connections: Secure screw terminals for the current-carrying wires, with a 3-pin header for power and signal .

• Factory-Calibrated: Trimmed for accuracy during manufacturing, with stable output offset voltage .

Technical Specifications