Quality Standards and Environmental Certifications

ACS37612: Standalone Coreless Differential Current Sensor IC

ACS37612: a standalone Hall-based coreless current sensor that measures currents from 200A to >1000A without requiring a core or a shield.

ACS37612 Datasheet
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Description

Top Features

The ACS37612 is a standalone coreless current sensor IC that provides an economical and precise solution for AC and DC current sensing without requiring a magnetic concentrator core or a shield. The ACS37612 measures currents from 200A to >1000A flowing through a PCB or a busbar with a typical accuracy of 1%.

The differential Hall-based sensing topology used to measure the magnetic field virtually eliminates error from common-mode stray magnetic field without the need of a laminated shield required by competing solutions, which reduces the design size and bill of materials (BOM). High isolation is achieved via the no-contact nature of this simple assembly. A 240KHz bandwidth makes it ideal for inverter phase current sensing, load detection and management, power supplies and DC/DC converters where fast switching is required. The high response time enables overcurrent fault detection in safety critical applications. A –40°C to 150°C ambient operating temperature and a stellar ESD rating make it ready for the harsh automotive environment.

The ACS37612 is offered in a low-profile 8-pin surface mount TSSOP package (thin-shrink small outline package, suffix LU) that is ideal for space-constrained applications, while allowing simple surface mount assembly.

  • Eliminates the need for a concentrator core or a shield
  • Contactless, lossless current sensing for applications where current flows through busbar or PCB
  • Differential sensing rejects common-mode stray fields
  • 3.3 and 5.0 V single supply operation
  • Monolithic Hall IC for high reliability with up to 240 kHz sensor bandwidth
  • Factory-trimmed sensitivity and offset for improved accuracy

Typical Applications

Automotive

Industrial

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The ACS3761X Hall-effect sensor IC solution family is a coreless and shield-free solution, reducing BOM and overall inverter size and weight. These differential sensors reject stray magnetic fields, reducing reliance on software. The family is optimized for a large range of currents, 100 A to >4000 A, making it ideal for automotive applications.
The ACS3761X Hall-effect sensor IC solution family is a coreless and shield-free solution, reducing BOM and overall inverter size and weight. These differential sensors reject stray magnetic fields, reducing reliance on software. The family is optimized for a large range of currents, 100 A to >4000 A, making it ideal for automotive applications.

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant 		Part Composition /
RoHS Data 		Comments Samples Check Stock
ACS37612LLUATR-005B5 8-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep		 Check
Distributor Stock
ACS37612LLUATR-010B3 8-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep		 Check
Distributor Stock
ACS37612LLUATR-010B5 8-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep		 Check
Distributor Stock
ACS37612LLUATR-015B5 8-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep		 Check
Distributor Stock
ACS37612LLUATR-015U5 8-lead TSSOP -40°C to 150°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.

8-Pin-TSSOP-LU-Package, used in the ACS37612 coreless differential current sensor IC

Packaging

The ACS37612 is offered in a low-profile 8-pin surface mount TSSOP package (thin-shrink small outline package, suffix LU) that is ideal for space-constrained applications, while allowing simple surface mount assembly. 

LU Package Documentation

Design Support Tools

Busbar Calculator for DC Currents »

Coreless PCB Calculator (ZIP) 

Models

ACS LTspice Library 

Gerber Files

ASEK37612LU 3.5mm EVB Gerber Files (ZIP)

ASEK37612LU 4.5mm EVB Gerber Files (ZIP)

ASEK37612LU 7mm EVB Gerber Files (ZIP)

ASEK37612LU Busbar EVB Gerber Files (ZIP)

Evaluation Board

ASEK37612 Demo Board User’s Guide

 

Documentation & Resources

Technical Article

Rethink PCB Current Sensing

This article will discuss two new innovative approaches to measure currents up to 600 A in PCB: a near-lossless Hall-based current sensor with an integrated conductor and a non-invasive standalone core-free and shield-free differential Hall current sensor.

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Application Note

PCB Ground Plane Optimization for Coreless Current Sensor Applications

January 31, 2023

This application note provides guidelines on how a PCB ground plane around the sensor location should be designed to achieve optimum performances.

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Application Note

Guidelines for Designing a Busbar with Notch for Allegro's ACS37612 Differential Coreless Current Sensor

AN296188 - This application note offers guidelines for achieving optimum busbar and notch designs using the Allegro ACS37612 coreless current sensor

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Application Note

Transient Current Behavior in Applications using the Allegro Coreless ACS37610 Differential Current Sensor

AN296258 - This application note explains how the conductor design can impact the response time of the current measurement for coreless current sensing applications and provides examples of response time to transient current for two types of conductors.

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Brochure

Brochure: Allegro Coreless Current Sensing

Allegro’s Coreless Current Sensing Technology provides a highly accurate method of measuring hundreds or thousands of amps flowing through a busbar or a PCB without needing a concentrator core or U-Shaped Magnetic Shield.

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