ACS711: Hall Effect Linear Current Sensor with Overcurrent Fault Output for <100 V Isolation Applications

Description

The Allegro ACS711 provides economical and precise solutions for AC or DC current sensing in <100 V audio, communications systems, and white goods. The device package allows for easy implementation by the customer. Typical applications include circuit protection, current monitoring, and motor and inverter control.

The device consists of a 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.

The output of the device has a positive slope proportional to the current flow from IP+ to IP– (pins 1 and 2, to pins 3 and 4). The internal resistance of this conductive path is 0.6 mΩ for the EX package, and 1.2 mΩ for the LC package, providing a non-intrusive measurement interface that saves power in applications that require energy efficiency.

The ACS711 is optimized for low-side current sensing applications, although the terminals of the conductive path are electrically isolated from the sensor IC leads, providing sufficient internal creepage and clearance dimensions for a low AC or DC working voltage applications. The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions.

The ACS711 is provided in small, surface mount packages: SOIC8 and QFN12. 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. Typical applications include circuit protection, current monitoring, and motor and inverter control.

Top Features

  • No external sense resistor required; single package solution
  • Reduced Power Loss:
    • 0.6 mΩ internal conductor resistance on EX package
    • 1.2 mΩ internal conductor resistance on LC package
  • Economical low- and high-side current sensing
  • Output voltage proportional to AC or DC currents
  • ±12.5 A and ±25 A full scale sensing ranges on LC package
  • ±15.5 A and ±31 A full scale sensing ranges on EX package
  • Overcurrent FAULT trips and latches at 100% of full-scale current
  • Low-noise analog signal path
  • 100 kHz bandwidth
  • Small footprint, low-profile SOIC8 and QFN packages
  • 3.0 to 5.5 V, single supply operation
  • Integrated electrostatic shield for output stability
  • Factory-trimmed for accuracy
  • Extremely stable output offset voltage
  • Zero magnetic hysteresis
  • Ratiometric output from supply voltage

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
ASEK711KEX-15AB-J DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check
Distributor Stock
ASEK711KEX-15AB-T DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
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ASEK711KEX-31AB-J DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
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ASEK711KEX-31AB-T DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check
Distributor Stock
ACS711EEXLT-15AB-T 12-lead QFN -40°C to 85°C Yes View Data Not for new design Contact your
local sales rep
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ACS711EEXLT-31AB-T 12-lead QFN -40°C to 85°C Yes View Data Not for new design Contact your
local sales rep
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ACS711EEXLT-8AB-T 12-lead QFN -40°C to 85°C Yes View Data Not for new design Contact your
local sales rep
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ACS711ELCTR-12AB-T 8-lead SOIC -40°C to 85°C Yes View Data Contact your
local sales rep
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ACS711ELCTR-25AB-T 8-lead SOIC -40°C to 85°C Yes View Data Contact your
local sales rep
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ACS711KEXLT-15AB-T 12-lead QFN -40°C to 125°C Yes View Data Contact your
local sales rep
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ACS711KEXLT-30AU-T 12-lead QFN -40°C to 125°C Yes View Data Contact your
local sales rep
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ACS711KEXLT-31AB-T 12-lead QFN -40°C to 125°C Yes View Data Contact your
local sales rep
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ACS711KLCLU-25AU-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
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ACS711KLCTR-12AB-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
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Distributor Stock
ACS711KLCTR-25AB-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
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Distributor Stock
ACS711KLCTR-25AU-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
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ACS711KLCTR-30AB-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
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ACS711KLCTR-48AU-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
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Distributor Stock
ASEK711KLC-12AB-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check
Distributor Stock
ASEK711KLC-25AB-T DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check
Distributor 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.

Allegro MicroSystems, LLC provides Gerber files for reference only. Any material, information, or instructions are provided AS IS without warranty of any kind. It is the responsibility of the User(s) to optimize any Printed Circuit Board (PCB) layout, as well as the selection of any components, for the specific application of the User(s).