The 20A Range Current Sensor Module ACS712 consists of a precise, low-offset, linear  with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field in which the converts into a proportional voltage

Sensing and controlling current flow is a fundamental requirement in a wide variety of applications including, over-current protection circuits, battery chargers, switching mode power supplies, digital watt meters, programmable current sources, etc

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