Approximate Scale 1:1

isolation solution for AC or DC current sensing in industrial,

commercial,andcommunicationssystems.Thesmallpackageis

ideal for space constrained applications, though the wide-body

provides the creepage and clearance needed for high isolation.

Typical applications include motor control, load detection and

management, switched-mode power supplies, and overcurrent

fault protection.

The device consists of a low-offset, linear Hall sensor circuit

with a copper conduction path located near the surface of the

die.Appliedcurrentflowingthroughthiscopperconductionpath

generatesamagneticfieldwhichissensedbytheintegratedHall

IC and converted into a proportional voltage. Device accuracy

is optimized through the close proximity of the magnetic field

to the Hall transducer. A proportional voltage is provided by

the low-offset, chopper-stabilized BiCMOS Hall IC, which

is programmed for accuracy after packaging. The output of

the device has a positive slope when an increasing current

flows through the primary copper conduction path (from pins

1 through 4, to pins 5 through 8), which is the path used for

current sensing. The internal resistance of this conductive path

is 0.85 mΩ typical, providing low power loss.

The terminals of the conductive path are electrically isolated

from the sensor leads (pins 10 through 15). This allows the

ACS718 current sensor IC to be used in high-side current sense

applicationswithouttheuseofhigh-sidedifferentialamplifiers

or other costly isolation techniques.

The ACS718 is provided in a small, low profile surface mount

SOICW16 package (suffix MA). The device is lead (Pb) free

with 100% matte tin leadframe plating. The device is fully

calibrated prior to shipment from the factory.

ACS718-DS, Rev. 1

• IEC/UL 60950-1 Ed. 2 certified to:

□ Dielectric Strength = 4800 Vrms (tested for 60 seconds)

□ Basic Isolation = 1550 Vpeak

□ Reinforced Isolation = 800 Vpeak

• Small footprint, low-profile SOIC16 wide-body package

suitable for space constrained applications that require

high galvanic isolation

• 0.85mΩ primary conductor for low power loss and high

inrush current withstand capability

input referred noise of 70 mA(rms) at max bandwidth (40

kHz)

• 5.0 V, single supply operation

• Output voltage proportional to AC or DC current

• Factory-trimmed sensitivity and quiescent output voltage

for improved accuracy

• Chopper stabilization results in extremely stable quiescent

output voltage

• Ratiometric output from supply voltage

High Isolation Linear Current Sensor IC with

850 µΩ Current Conductor

Typical Application

ACS718

C

BYPASS

0.1 µF

CL

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

IP+

IP+

IP+

IP+

IP–

IP–

IP–

IP–

+I

P

–I

P

I

P

NC

GND

NC

NC

VIOUT

NC

VCC

NC

The ACS718 outputs an

changes, proportionally,

with the bidirectional AC

or DC primary sensed

specified measurement

range.

ACS718

FEATURES AND BENEFITS

DESCRIPTION

Package: 16-Pin SOICW (suffix MA)

CB Certificate Number:

US-22339-A1-UL

TÜV America

Certificate Number:

U8V 14 11 54214 030

CB 14 11 54214 029

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