The ACS712 is an economical and precise AC or DC current sensor, suitable for industrial, automotive, commercial, and communications systems. It provides a linear output that varies with the sensed current, and has low offset. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.
The ACS712 provides a low‑noise analog output proportional to AC or DC current, featuring a 2.1 kVRMS voltage isolation and a low‑resistance (1.2 mΩ) copper conductor. It is offered in a compact 8‑pin SOIC package and is factory‑trimmed for accuracy, making it suitable for motor control, load detection, switched‑mode power supplies, and over‑current protection.
The device includes a FILTER pin for external RC filtering, an internal buffer to prevent signal attenuation, and a range of selectable sensitivities (66 mV/A to 185 mV/A) with a typical bandwidth of 50 kHz. Detailed electrical characteristics, performance curves, and application notes are provided to aid designers in integrating the sensor into high‑accuracy systems.