ACS712: Fully Integrated, Hall-Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor


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.

The output of the device has a positive slope (>VIOUT(Q)) when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is 1.2 mΩ typical, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor IC leads (pins 5 through 8). This allows the ACS712 current sensor IC to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

The ACS712 is provided in a small, surface mount SOIC8 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

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Respin Sales, Inc. (Allegro & Sanken Semiconductors) 
608 Westwood Office Park
Fredericksburg, VA 22401
Phone: 540-548-4979
Web: www.respinsales.com
Email: ronid@respinsales.com

If this is not your local representative, find your local sales rep here.

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

The ACS712 is provided in a small, surface mount SOIC8 package (suffix LC). The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

LC SOIC 8 lead

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Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
ACS712ELCTR-05B-T 8-lead SOIC -40°C to 85°C Yes View Data Contact your
local sales rep
Check stock
ACS712ELCTR-20A-T 8-lead SOIC -40°C to 85°C Yes View Data Contact your
local sales rep
Check stock
ACS712ELCTR-30A-T 8-lead SOIC -40°C to 85°C Yes View Data Contact your
local sales rep
Check stock
ASEK712ELC-05B-T DEMO BOARD -40°C to 85°C No -- Contact your
local sales rep
Check stock
ASEK712ELC-20A-T DEMO BOARD -40°C to 85°C No -- Contact your
local sales rep
Check stock
ASEK712ELC-30A-T DEMO BOARD -40°C to 85°C No -- Contact your
local sales rep
Check stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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