ACS756: Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor

Description

The Allegro ACS756 family of current sensor ICs consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near 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 at the factory.

The output of the device has a positive slope (>VCC / 2) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sensing. The internal resistance of this conductive path is 130 µΩ 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 leads (pins 1 through 3). This allows the ACS756 family of sensor ICs to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

The device is fully calibrated prior to shipment from the factory. The ACS75x family is lead (Pb) free. All leads are plated with 100% matte tin, and there is no Pb inside the package. The heavy gauge leadframe is made of oxygen-free copper.

 

Typical Applications: 

  • Motor control
  • Load detection and management
  • Power supplies
  • Overcurrent fault protection

Top Features

  • Industry-leading noise performance through proprietary amplifier and filter design techniques
  • Total output error 0.8% at TA = 25°C
  • Small package size, with easy mounting capability
  • Monolithic Hall IC for high reliability
  • Ultra-low power loss: 130 µΩ internal conductor resistance
  • 3 kVRMS minimum isolation voltage from pins 1-3 to pins 4-5
  • 3.0 to 5.0 V, single supply operation
  • 3 μs output rise time in response to step input current
  • 20 or 40 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
ACS756SCB-050B-PFF-T 5-lead CB -20°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
ACS756SCB-100B-PFF-T 5-lead CB -20°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
ACS756KCB-050B-PFF-T 5-lead CB -40°C to 125°C Yes View Data 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.

Packaging

Package CB, 5-pin package, leadform PFF

CA/CB 5 pin

CB PFF Package stp Model

Design Support Tools

Certificates of Compliance

CB Certificates

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).