ACS71240: Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages

The ACS71240 family of automotive AEC-Q100 qualified, monolithic Hall effect current sensor ICs offers next generation improvements over the popular Allegro ACS711 predecessor family of Current Sensor ICs. These improvements include output signal immunity to stray magnetic fields (created by adjacent motors or current carrying wires), improved output signal accuracy (<+/-1.5% typical) and output signal immunity to noisy supply voltage rails. The device also has a dedicated fast Overcurrent Fault output that has a typical response time of 1.5 us. This fast fault output provides a simple means of detecting short circuit events that will prevent MOSFET or IGBT damage in inverter, motor or other switching power electronics applications.

The ACS71240 is offered in two very small form factor package options, each providing different levels of galvanic isolation. The tiny 3mm x 3mm, wettable flank QFN package can be used on voltage rails up to 120VDC and enables solder joint inspection required in zero PPM automotive applications. The standard footprint SOIC8 package is UL certified to 2400VRMS of isolation and offers a working voltage of 420VDC or 297VRMS.

The ACS71240 family is designed to replace shunt resistors, operational amplifiers, current transformers and voltage isolators in applications that require small form factor, monolithic sensor solutions. These fully integrated solutions reduce the overall cost of current sensing by eliminating discrete components that demand printed circuit board area. The sensors are offered for use on 5V or 3.3V power supplies.

DATASHEETS
SAMPLE & BUY
Arrow Electronics (Distributor, Allegro & Sanken Semiconductors)
25 Hub Drive
Melville, NY 11747
Phone: 1-800-777-2776 for local distributor
Web: www.arrow.com

If this is not your local representative, find your local sales rep here.

  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • AEC-Q100 qualified
  • Differential Hall sensing rejects common-mode stray magnetic fields
  • Overcurrent FAULT with a Factory Programmable trip range of 50% to 200% of full-scale current
  • Non-Ratiometric output provides immunity to noisy supplies
  • Galvanically Isolated:
    • QFN package: 120VDC working voltage
    • SOIC8 package: UL certified to 2400VRMS, working voltage of 420VDC or 297VRMS
  • Reduced Power Loss:
    • 0.6 mΩ internal conductor resistance on QFN package
    • 1.2 mΩ internal conductor resistance on SOIC8 package
  • Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients
  • Output voltage proportional to AC or DC current
  • High-bandwidth 120 kHz analog output for faster response times in control applications
  • Factory-trimmed sensitivity and quiescent output voltage for improved accuracy
  • 3.3 and 5 V single supply operation
  • Small footprint, low-profile QFN and SOIC8 packages suitable for space-constrained applications

Design Support Tools

Allegro MicroSystems 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).

Application Notes

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Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
ASEK71240EXB-010B3 DEMO BOARD -20°C to 85°C No -- New Contact your
local sales rep
Check Stock
ASEK71240EXB-030B3 DEMO BOARD -20°C to 85°C No -- New Contact your
local sales rep
Check Stock
ASEK71240EXB-050U5 DEMO BOARD -20°C to 85°C No -- New Contact your
local sales rep
Check Stock
ASEK71240LLC-10B3 DEMO BOARD -20°C to 85°C No -- New Contact your
local sales rep
Check Stock
ASEK71240LLC-30B3 DEMO BOARD -20°C to 85°C No -- New Contact your
local sales rep
Check Stock
ASEK71240LLC-50U5 DEMO BOARD -20°C to 85°C No -- New Contact your
local sales rep
Check Stock
ACS71240KEXBLT-010B3 12-lead QFN -40°C to 125°C Yes View Data New Contact your
local sales rep
Check Stock
ACS71240KEXBLT-010B3-115 12-lead QFN -40°C to 125°C Yes View Data New Contact your
local sales rep
Check Stock
ACS71240KEXBLT-030B3 12-lead QFN -40°C to 125°C Yes View Data New Contact your
local sales rep
Check Stock
ACS71240KEXBLT-050U5 12-lead QFN -40°C to 125°C Yes View Data New Contact your
local sales rep
Check Stock
ACS71240LLCBTR-010B3 8-lead SOIC -40°C to 150°C Yes View Data New Contact your
local sales rep
Check Stock
ACS71240LLCBTR-030B3 8-lead SOIC -40°C to 150°C Yes View Data New Contact your
local sales rep
Check Stock
ACS71240LLCBTR-045B5 8-lead SOIC -40°C to 150°C Yes View Data New Contact your
local sales rep
Check Stock
ACS71240LLCBTR-050U5 8-lead SOIC -40°C to 150°C Yes View Data New Contact your
local sales rep
Check 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.

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