ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor
Not for New Design
These parts are in production but have been determined to be
NOT FOR NEW DESIGN. This classification indicates that sale of
this device is currently restricted to existing customer applications.
The device should not be purchased for new design applications
because obsolescence in the near future is probable. Samples are no
longer available.
Date of status change: June 5, 2017
Recommended Substitutions:
For existing customer transition, and for new customers or new appli-
cations, use
ACS723.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor
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Features and Benefits
Low-noise analog signal path
Device bandwidth is set via the new FILTER pin
5 µs output rise time in response to step input current
80 kHz bandwidth
Total output error 1.5% at T
A
= 25°C
Small footprint, low-profile SOIC8 package
1.2 mΩ internal conductor resistance
2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8
5.0 V, single supply operation
66 to 185 mV/A output sensitivity
Output voltage proportional to AC or DC currents
Factory-trimmed for accuracy
Extremely stable output offset voltage
Nearly zero magnetic hysteresis
Ratiometric output from supply voltage
Description
The Allegro
™
ACS712 provides economical and precise
solutions for AC or DC current sensing in industrial, commercial,
and communications systems. The device package allows for
easy implementation by the customer. Typical applications
include motor control, load detection and management, switch-
mode power supplies, and overcurrent fault protection. The
device is not intended for automotive applications.
The device consists of a precise, low-offset, linear Hall circuit
with a copper conduction path located near the surface of the
die. Applied current flowing through this copper conduction
path generates a magnetic field which the Hall IC converts into a
proportional voltage. Device accuracy is optimized through the
close proximity of the magnetic signal to the Hall transducer.
A precise, 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 (>V
IOUT(Q)
)
when an increasing current flows through the primary copper
conduction path (from pins 1 and 2, to pins 3 and 4), which is
the path used for current sampling. The internal resistance of
this conductive path is 1.2 mΩ typical, providing low power
loss. The thickness of the copper conductor allows survival of
Continued on the next page…
TÜV America
Certificate Number:
U8V 06 05 54214 010
Package: 8 Lead SOIC (suffix LC)
Approximate Scale 1:1
Typical Application
+5 V
V
OUT
C
BYP
0.1 µF
1
2
I
P
3
4
IP+
VCC
8
7
IP+ VIOUT
ACS712
IP– FILTER
IP–
GND
6
5
C
F
1 nF
Application 1. The ACS712 outputs an analog signal, V
OUT
.
that varies linearly with the uni- or bi-directional AC or DC
primary sampled current, I
P
, within the range specified. C
F
is recommended for noise management, with values that
depend on the application.
ACS712-DS, Rev. 16
June 5, 2017
ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with
2.1 kVRMS
Isolation and a Low-Resistance Current Conductor
Description (continued)
the device at up to 5× overcurrent conditions. The terminals of the
conductive path are electrically isolated from the signal leads (pins
5 through 8). This allows the ACS712 to be used in applications
requiring electrical isolation without the use of opto-isolators or
other costly isolation techniques.
The ACS712 is provided in a small, surface mount SOIC8 package.
The leadframe is plated with 100% matte tin, which is compatible
with standard lead (Pb) free printed circuit board assembly processes.
Internally, the device is Pb-free, except for flip-chip high-temperature
Pb-based solder balls, currently exempt from RoHS. The device is
fully calibrated prior to shipment from the factory.
Selection Guide
Part Number
ACS712ELCTR-05B-T
ACS712ELCTR-20A-T
ACS712ELCTR-30A-T
Packing*
Tape and reel, 3000 pieces/reel
Tape and reel, 3000 pieces/reel
Tape and reel, 3000 pieces/reel
T
A
(°C)
–40 to 85
–40 to 85
–40 to 85
Optimized Range, I
P
(A)
±5
±20
±30
Sensitivity, Sens
(Typ) (mV/A)
185
100
66
*Contact Allegro for additional packing options.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Output Current Source
Output Current Sink
Overcurrent Transient Tolerance
Nominal Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
V
IOUT
V
RIOUT
I
IOUT(Source)
I
IOUT(Sink)
I
P
T
A
T
J
(max)
T
stg
1 pulse, 100 ms
Range E
Notes
Rating
8
–0.1
8
–0.1
3
10
100
–40 to 85
165
–65 to 170
Units
V
V
V
V
mA
mA
A
ºC
ºC
ºC
Isolation Characteristics
Characteristic
Dielectric Strength Test Voltage*
Working Voltage for Basic Isolation
Working Voltage for Reinforced Isolation
Symbol
V
ISO
V
WFSI
V
WFRI
Notes
Agency type-tested for 60 seconds per
UL standard 60950-1, 1st Edition
For basic (single) isolation per UL standard
60950-1, 1st Edition
For reinforced (double) isolation per UL standard
60950-1, 1st Edition
Rating
2100
354
184
Unit
VAC
VDC or V
pk
VDC or V
pk
* Allegro does not conduct 60-second testing. It is done only during the UL certification process.
Parameter
Fire and Electric Shock
Specification
CAN/CSA-C22.2 No. 60950-1-03
UL 60950-1:2003
EN 60950-1:2001
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with
2.1 kVRMS
Isolation and a Low-Resistance Current Conductor
Functional Block Diagram
+5 V
VCC
(Pin 8)
Hall Current
Drive
IP+
(Pin 1)
Sense Temperature
Coefficient Trim
Dynamic Offset
Cancellation
IP+
(Pin 2)
Signal
Recovery
R
F(INT)
VIOUT
(Pin 7)
IP−
(Pin 3)
IP−
(Pin 4)
Sense
Trim
0 Ampere
Offset Adjust
GND
(Pin 5)
FILTER
(Pin 6)
Pin-out Diagram
IP+
IP+
IP–
IP–
1
2
3
4
8
7
6
5
VCC
VIOUT
FILTER
GND
Terminal List Table
Number
1 and 2
3 and 4
5
6
7
8
Name
IP+
IP–
GND
FILTER
VIOUT
VCC
Description
Terminals for current being sampled; fused internally
Terminals for current being sampled; fused internally
Signal ground terminal
Terminal for external capacitor that sets bandwidth
Analog output signal
Device power supply terminal
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with
2.1 kVRMS
Isolation and a Low-Resistance Current Conductor
COMMON OPERATING CHARACTERISTICS
1
over full range of T
A
, C
F
= 1 nF, and V
CC
= 5 V, unless otherwise specified
Characteristic
Supply Voltage
Supply Current
Output Capacitance Load
Output Resistive Load
Primary Conductor Resistance
Rise Time
Frequency Bandwidth
Nonlinearity
Symmetry
Zero Current Output Voltage
Power-On Time
Magnetic Coupling
2
Internal Filter Resistance
3
1
Device
Symbol
V
CC
I
CC
C
LOAD
R
LOAD
R
PRIMARY
t
r
f
E
LIN
E
SYM
V
IOUT(Q)
t
PO
R
F(INT)
Test Conditions
Min.
4.5
Typ.
5.0
10
–
–
1.2
3.5
80
1.5
100
V
CC
×
0.5
35
12
1.7
Max.
5.5
13
10
–
–
–
–
–
102
–
–
–
Units
V
mA
nF
kΩ
mΩ
μs
kHz
%
%
V
µs
G/A
kΩ
ELECTRICAL CHARACTERISTICS
V
CC
= 5.0 V, output open
VIOUT to GND
VIOUT to GND
T
A
= 25°C
I
P
= I
P
(max), T
A
= 25°C, C
OUT
= open
–3 dB, T
A
= 25°C; I
P
is 10 A peak-to-peak
Over full range of I
P
Over full range of I
P
Bidirectional; I
P
= 0 A, T
A
= 25°C
Output reaches 90% of steady-state level, T
J
= 25°C, 20 A present
on leadframe
–
–
4.7
–
–
–
–
98
–
–
–
may be operated at higher primary current levels, I
P
, and ambient, T
A
, and internal leadframe temperatures, T
A
, provided that the Maximum
Junction Temperature, T
J
(max), is not exceeded.
2
1G = 0.1 mT.
3
R
F(INT)
forms an RC circuit via the FILTER pin.
COMMON THERMAL CHARACTERISTICS
1
Min.
Operating Internal Leadframe Temperature
Junction-to-Lead Thermal Resistance
2
Junction-to-Ambient Thermal Resistance
1
Additional
Typ.
–
Max.
85
Value
5
23
Units
°C
Units
°C/W
°C/W
T
A
R
θJL
R
θJA
E range
Mounted on the Allegro ASEK 712 evaluation board
–40
Mounted on the Allegro 85-0322 evaluation board, includes the power con-
sumed by the board
thermal information is available on the Allegro website.
2
The Allegro evaluation board has 1500 mm
2
of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connect-
ing the layers. Performance values include the power consumed by the PCB. Further details on the board are available from the Frequently Asked
Questions document on our website. Further information about board design and thermal performance also can be found in the Applications Informa-
tion section of this datasheet.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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