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

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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

High Voltage Traction Inverters
Auxiliary Inverters for Integrated
Starter Generators (iBSG)
- 12V and 48V systems
- Direct Connect or Belt Driven Systems.
Battery Disconnect Junction Boxes
Disconnect and Smart Fuse Functions DC/DC Converter

Industrial

Switching Power Supplies
- DC/DC Converters
- DC/AC Inverters
Grid Infrastructure and Power Distribution

ACS37612 Standalone coreless differential current sensor with contactless current sensing for ACand DC current sensing functional block diagram

ACS37612 Standalone coreless differential current sensor with contactless current sensing for ACand DC current sensing typical application diagram

Part Number Specifications and Availability

Part Number	Package Type	Temperature	RoHS Compliant	Part Composition / RoHS Data	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.

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

AN296277 - 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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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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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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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.