ACS37611
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection, Overcurrent and Overtemperature Detection
FEATURES AND BENEFITS
• Eliminates need for concentrator core or shield
• Contactless, lossless, noninvasive current sensing
• Suited for applications where current flows through
busbar or PCB
• High operating bandwidth: DC to 250 kHz
• Overcurrent (OCF) and overtemperature (OTF)
detection on the fault pin
• Differential Hall sensing rejects common-mode
magnetic fields
• Very fast response time (<2 μs typ)
• Wide sensing range (3 to 28 mV/G)
□ Ideal for sensing currents from 100 A to >4000 A
• Factory-programmed segmented linear temperature
compensation (TC) provides low thermal drift
□ Sensitivity ±1% (typ)
□ Offset ±3 mV (typ)
• Customer-programmable, high-resolution offset and
sensitivity trim
• Wide spacing of Hall elements for improved SNR and
thermal performance
• Ultra-sensitive Hall elements for improved noise
performance
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DESCRIPTION
The Allegro ACS37611 current sensor IC enables low-cost
solutions forAC and DC current sensing without the need for an
external field concentrator core or a U-shaped magnetic shield.
It is designed for applications where hundreds or thousands of
amperes flow through a busbar or PCB.
Current flowing through a busbar or PCB trace generates a
magnetic field that is sensed by the monolithic, low-offset, linear
Hall IC. The differential sensing topology virtually eliminates all
types of error caused by common-mode stray magnetic fields. The
wide spacing between the differential Hall elements (2.58 mm)
coupled with the increased sensitivity of each Hall element enable
the ACS37611 to achieve a superior signal-to-noise ratio (SNR)
and improved resolution. While not mandatory, a notch or slit in
the current-carrying busbar or PCB copper trace provides further
improvements to system SNR. High isolation is achieved via
the no-contact nature of this simple assembly.
The ACS37611 is offered with regular and low-power mode,
enabling customers to achieve optimal SNR and power
consumption.Adedicated user-programmable overcurrent and
overtemperature fault pin and a slew of built-in diagnostics,
including broken-ground and VCC detection, make it ideal
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PACKAGE:
8-pin TSSOP package (suffix LU)
Not to scale
TYPICAL APPLICATIONS
• High-voltage traction motor inverter
• 48 V/12 V auxiliary inverter
• Heterogeneous redundant battery monitoring
• Overcurrent detection
• DC-to-DC converter
• Smart fuse
• Power distribution unit (PDU)
• Power supply
ACS37611
ACS37611
Figure 1: Current Through PCB
ACS37611-DS, Rev. 1
MCO-0001858
Figure 2: Current Through Busbar
May 22, 2025
