ACS773: High Accuracy, Hall-Effect-Based, 200 kHz Bandwidth, Galvanically Isolated Current Sensor IC with 100 μΩ Current Conductor


The ACS773 is an automotive grade, 200KHz Bandwidth Current Sensor IC in Allegro’s proprietary CB package. It offers a wide current sensing range (50A to 400A) and very low power loss achieved by the 100 μΩ internal resistance of its conductive path. The ACS773 achieve the highest performance in the CB package family with an accuracy of +/-2.1% over the lifetime of the IC from room to hot temperature. The 2.5 μs response time enables overcurrent fault detection in safety-critical applications while the Reinforced Galvanic Isolation reduces the bill of materials. It works off of a single 5 V supply (ACS772) or 3.3V (ACS773).

The ACS773 is ideal for Automotive application such as OBC, DC/DC converters and Inverter control as well as for industrial applications such as motor control, load detection and management and power supplies.

This sensor is provided in an Allegro custom CB package offering a very small form footprint, lower ICC and higher accuracy over current sensor modules offered by competing solutions. The ACS773 has a 2.5μs response time, which is the fastest response time IC ever offered in the custom Allegro CB package.

Target Applications:

  • OBC
  • EV Charging Stations
  • Inverters
  • Power supplies
  • Overcurrent fault protection
  • Any high accuracy current sensing apps requiring >50A (continuous), 2.5μs response time AND high isolation.

Top Features

  • AEC-Q100 Grade 1 qualified
  • Typical of 2.5 μs output response time
  • 3.3 V supply operation
  • Ultra-low power loss: 100 μΩ internal conductor resistance
  • Reinforced galvanic isolation allows use in economical, high-side current sensing in high-voltage systems
  • 4800 Vrms dielectric strength certified under UL60950-1
  • Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques
  • Integrated shield greatly reduces capacitive coupling from current conductor to die due to high dV/dt signals, and prevents offset drift in high-side, high-voltage applications
  • Greatly improved total output error through digitally programmed and compensated gain and offset over the full operating temperature range
  • Small package size, with easy mounting capability
  • Monolithic Hall IC for high reliability
  • Output voltage proportional to AC or DC currents
  • Factory-trimmed for accuracy
  • Extremely stable output offset voltage

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
ACS773ECB-200B-PFF-T 5-lead CB -40°C to 85°C Yes View Data Contact your
local sales rep
Distributor Stock
ASEK773ECB-200B-T DEMO BOARD -40°C to 85°C No -- Contact your
local sales rep
Distributor Stock
ACS773LCB-050B-PFF-T 5-lead CB -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
ACS773LCB-100B-PFF-T 5-lead CB -40°C to 150°C Yes View Data Contact your
local sales rep
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).