ACS712 Datasheet – Current Sensor – Allegro

Part number : ACS712

Function : Hall Effect-Based Linear Current Sensor IC

Package : 8 Lead SOIC Type

Manufacturer : Allegro MicroSystems


ACS712 Current Sensor


The Allegro ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device is not intended for automotive applications. For the automotive grade version, see ACS714.

The device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after packaging.


ACS712 pinout datasheet arduino


1. Low-noise analog signal path
2. Device bandwidth is set via the new FILTER pin
3. 5 µs output rise time in response to step input current
4. 80 kHz bandwidth
5. Total output error 1.5% at TA = 25°C
6. Small footprint, low-profile SOIC8 package
7. 1.2 mΩ internal conductor resistance
8. 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8
9. 5.0 V, single supply operation
10. 66 to 185 mV/A output sensitivity
11. Output voltage proportional to AC or DC currents
12. Factory-trimmed for accuracy
13. Extremely stable output offset voltage
14. Nearly zero magnetic hysteresis
15. Ratiometric output from supply voltage

Application Circuits

ACS712 circuit

ACS712 Datasheet PDF