ACS712 30A Range Current Sensor Module

Product Description The ACS712 30A Current Sensor Module provides an economical and precise solution for AC or DC current sensing in industrial, commercial, and communications systems. Based on the Hall-effect principle, the module features a copper conduction path located near the surface of the die. When current flows through this path, it generates a magnetic field which the Hall IC converts into a proportional analog voltage. The 30A variant is specifically designed for high-power applications such as motor control, load detection, and overcurrent protection. Its primary advantage is the 2.1 kV RMS electrical isolation between the high-current conduction path and the low-voltage sensor electronics, ensuring safety for microcontrollers like Arduino and ESP32.

Key Features

• Bi-Directional Sensing: Capable of measuring both positive and negative current flow up to 30 Amperes.

• Galvanic Isolation: The conduction path is electrically isolated from the sensor leads, protecting your control circuitry from high-voltage spikes.

• Low Internal Resistance: The 1.2 mΩ internal conductor ensures minimal power loss and prevents the sensor from heating up during high-load operation.

• Analog Output: Provides a linear voltage output centered at VCC/2 (2.5V for a 5V supply) at zero current, simplifying signal processing.

• High Bandwidth: Supports up to 80 kHz sensing, making it suitable for monitoring fast-switching power supplies and PWM motor drivers.

Technical Details

• Sensing Mechanism: Uses a low-offset, chopper-stabilized BiCMOS Hall IC for superior temperature stability and accuracy.

• Sensitivity Calibration: Factory-tuned to 66 mV per Ampere, providing a predictable voltage curve for firmware calculations.

• Zero Current Offset: At 0A, the output voltage is exactly half of the supply voltage (VCC × 0.5), allowing for easy "center-point" calibration.

• Voltage Supply: Optimized for a stable 5.0V DC input; the output signal is ratiometric to the supply voltage.

• Magnetic Shielding: The internal structure is designed to be highly resistant to external stray magnetic fields.

• Thermal Performance: Capable of handling significant overcurrent transients without damaging the sensing element.

• Pin Configuration: Standard 3-pin header (VCC, GND, OUT) for logic and a heavy-duty 2-pin screw terminal for the high-current load.

• Signal Smoothing: The PCB includes a dedicated filter pin (FLT) with a pre-soldered capacitor to set the bandwidth and reduce noise.

• Isolation Rating: Certified for 2100V RMS minimum isolation between pins 1-4 and pins 5-8.

• Output Impedance: Features a low-noise analog signal path with a small output impedance for direct ADC interfacing.

• Total Output Error: Maintains a low error rate of 1.5% at room temperature, with internal temperature compensation.

• PCB Construction: Industrial-grade FR-4 with thick copper traces to handle the 30A current capacity safely.

• Mounting Design: Compact rectangular module fits easily into power distribution boxes and DIY project enclosures.

• Response Time: Ultra-fast 5 µs output rise time in response to step input current.

• Logic Compatibility: Native 5V logic; for 3.3V systems (ESP32/Raspberry Pi), a simple voltage divider is required on the output pin.