FEATURES AND BENEFITS
• No external sense resistor required; single package solution
• Reduced power loss:
□ 0.6 mΩ internal conductor resistance on EX package
□ 1.2 mΩ internal conductor resistance on LC package
• Economical low- and high-side current sensing
• Output voltage proportional to AC or DC currents
• ±12.5 A and ±25 A full-scale sensing ranges on LC package
• ±15.5 A and ±31 A full-scale sensing ranges on EX package
• Overcurrent ¯
F
¯
¯
A
¯
¯
U
¯
¯
L
¯
¯
T
¯
trips and latches at 100% of full-scale
current
• Low-noise analog signal path
• 100 kHz bandwidth
• Small footprint, low-profile SOIC8 and QFN packages
• 3 to 5.5 V single supply operation
• Integrated electrostatic shield for output stability
• Factory-trimmed for accuracy
• Extremely stable output offset voltage
• Zero magnetic hysteresis
• Ratiometric output from supply voltage
DESCRIPTION
The Allegro™ ACS711 provides economical and precise
solutions for AC or DC current sensing in <100 V audio,
communications systems, and white goods. The device package
allows for easy implementation by the customer. Typical
applications include circuit protection, current monitoring,
and motor and inverter control.
The device consists of a linear Hall sensor 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 is sensed by the integrated Hall IC
and converted into a proportional voltage. Device accuracy is
optimized through the close proximity of the magnetic signal
to the Hall transducer.
The output of the device has a positive slope proportional to
the current flow from IP+ to IP– (pins 1 and 2, to pins 3 and
4). The internal resistance of this conductive path is 0.6 mΩ
for the EX package, and 1.2 mΩ for the LC package, providing
a non-intrusive measurement interface that saves power in
applications that require energy efficiency.
The ACS711 is optimized for low-side current sensing
applications, although the terminals of the conductive path
are electrically isolated from the sensor IC leads, providing
sufficient internal creepage and clearance dimensions for a
low AC or DC working voltage applications. The thickness
of the copper conductor allows survival of the device at up to
IP+
IP+
IP–
IP–
IP
GND
ACS711
+3.3 V
VIOUT
VCC CBYP
0.1 μF
CLOAD
RPU
FAULT
ACS711
ACS711A-DS, Rev. 4
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for <100 V Isolation Applications
Continued on the next page…
Not to scale
PACKAGES:
Typical Application
8-pin SOICN
with internally fused path
(LC package)
Application 1. The ACS711 outputs
an analog signal, VIOUT
, that varies
linearly with the bi-directional AC or
DC primary current, IP
, within the
range specified. The ¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯
pin trips
when IP reaches ±100% of its full-
scale current.
12-contact QFN
3 mm × 3 mm × 0.75 mm
(EX package)
June 23, 2017
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Notes Rating Units
Supply Voltage VCC 7 V
Reverse Supply Voltage VRCC –0.1 V
Output Voltage VIOUT 7 V
Reverse Output Voltage VRIOUT –0.1 V
Working Voltage for Basic Isolation VWORKING Voltage applied between pins 1-4 and 5-8 100 VAC peak
or VDC
¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯
Pin Voltage VFAULT 7 V
Overcurrent Transient Tolerance IPOC 1 pulse, 100 ms 100 A
Nominal Operating Ambient Temperature TA
Range E –40 to 85 °C
Range K –40 to 125 °C
Maximum Junction Temperature TJ(max) 165 °C
Storage Temperature Tstg –65 to 170 °C
SELECTION GUIDE
Part Number TA
(°C)
Optimized Accuracy
Range, IP
(A)
Sensitivity
[2],
Sens (Typ)
(mV/A)
Package Packing
[1]
ACS711ELCTR-12AB-T –40 to 85 ±12.5 110
8-pin SOICN 3000 pieces/reel
ACS711KLCTR-12AB-T –40 to 125
ACS711ELCTR-25AB-T –40 to 85 ±25 55
ACS711KLCTR-25AB-T –40 to 125
ACS711EEXLT-31AB-T
[3][4] –40 to 85 ±31 45
12-contact QFN with
fused current loop 1500 pieces/reel
ACS711KEXLT-31AB-T
[3] –40 to 125
ACS711EEXLT-15AB-T
[3][4] –40 to 85 ±15.5 90
ACS711KEXLT-15AB-T
[3] –40 to 125
[1] Contact Allegro for additional packing options.
[2] Sensitivity measured with VCC = 3.3 V.
[3] QFN package not qualified for automotive applications.
[4] Variants ACS711EEXLT-15AB-T and ACS711EEXLT-31AB-T are Pre-End-of-Life. These device variants are approaching end of life.
Within a minimum of 6 months, these device variants will enter their final, Last Time Buy, order phase. Date of status change: June 5,
2017. Suggested replacements include ACS711KEXLT-15AB-T and ACS711KEXLT-31AB-T, respectively.
5× overcurrent conditions.
The ACS711 is provided in small, surface-mount packages: SOIC8
and QFN12. 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.
DESCRIPTION (CONTINUED)
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
VCC
VIOUT
240 kΩ
FAULT
GND
Dynamic Offset
Cancellation
IP+
IP+
IP−
IP−
Sensitivity
Trim
Signal
Recovery
Power-on
Reset
D
Reset
Master Current
Supply
Sensitivity
Temperature
Coefficient Trim
To all subcircuits Current Fault
Comparator
0 Ampere
Offset Adjust
Hall Current
Drive
CLOAD
CBYP
RPU
VCC
IP+
IP+
IP–
IP–
VCC
VIOUT
FAULT
GND
1
2
3
4
8
7
6
5
10
9
8
7
1
2
3
4
5
6
12
11
VCC
VIOUT
GND
FAULT
NC
NC
NC
NC
IP+
IP+
IP–
IP–
TERMINAL LIST TABLE
Name Number Description
EX LC
GND 5 5 Signal ground terminal
¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯ 66 Overcurrent fault; active low
IP– 3 and 4 3 and 4 Terminals for current being sensed; fused internally
IP+ 1 and 2 1 and 2 Terminals for current being sensed; fused internally
NC 7, 8, 9, 10 – No connection; connect to GND for optimal ESD performance.
VCC 12 8 Device power supply terminal
VIOUT 11 7 Analog output signal
Functional Block Diagram
PINOUT DIAGRAMS
LC PackageEX Package
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
COMMON OPERATING CHARACTERISTICS: Valid across the full range of TA
for the LC package and at TA
= 25°C for the EX package,
VCC = 3.3 V, unless otherwise specified
Characteristic Symbol Test Conditions Min. Typ. Max. Units
ELECTRICAL CHARACTERISTICS
Supply Voltage
[1] VCC 3 3.3 5.5 V
Supply Current ICC VCC = 3.3 V, output open – 4 5.5 mA
Output Capacitance Load CLOAD VIOUT to GND – – 1 nF
Output Resistive Load RLOAD VIOUT to GND 15 – – kΩ
Primary Conductor Resistance RIP
EX package – 0.6 – mΩ
LC package, TA = 25°C – 1.2 – mΩ
VIOUT Rise Time trIP = IPMAX, TA = 25°C, COUT = open – 3.5 – μs
Propagation Delay Time tPROP IP = IP(max), TA = 25°C, COUT = open – 1.2 – µs
Response Time tRESPONSE IP = IP(max), TA = 25°C, COUT = open – 4.6 – µs
Internal Bandwidth
[2] BWI–3 dB, TA = 25°C – 100 – kHz
Nonlinearity ELIN Over full range of IP– ±1 – %
Symmetry ESYM Apply full scale IP– 100 – %
VIOUT Saturation Voltages VIOH VCC – 0.3 – – V
VIOL – – 0.3 V
Quiescent Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – VCC / 2 – V
Power-On Time tPO
Output reaches 90% of steady-state level, TA = 25°C,
20 A present on primary conductor – 35 – μs
¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯
PIN CHARACTERISTICS
¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯
Operating Point IFAULT – ±1 × IP– A
¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯
Output Pullup
Resistor RPU 1 – – kΩ
¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯
Output Voltage VOH –VCC –
0.3 – V
VOL RPU = 1 kΩ – 0.3 – V
¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯
Response Time tFAULT Measured from | IP | > | IFAULT | to VFAULT ≤ VOL – 1.3 – µs
VCC Off Voltage Level for
Fault Reset [3] VCCFR – – 200 mV
VCC Off Duration for
Fault Reset [3] tCCFR 100 – – µs
[1] Devices are programmed for maximum accuracy at 3.3 V VCC levels. The device contains ratiometry circuits that accurately alter the 0 A Output
Voltage and Sensitivity level of the device in proportion to the applied VCC level. However, as a result of minor nonlinearities in the ratiometry
circuit additional output error will result when VCC varies from the 3.3 V VCC level. Customers that plan to operate the device from a 5 V regulated
supply should contact their local Allegro sales representative regarding expected device accuracy levels under these bias conditions.
[2] Calculated using the formula BWI = 0.35 / tr.
[3] After the ¯
F
¯
¯
A
¯
U ¯¯L
¯
¯
T
¯
pin is latched low, the only way to reset it is through a power-off and power-on cycle on the VCC pin. For fault reset, VCC must
stay below VCCFR for a period greater than tCCFR before settling to the normal operation voltage (3 to 5.5 V).
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
5
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
x12AB PERFORMANCE CHARACTERISTICS for LC package and E Temperature Range
[1]
TA = 25°C and VCC = 3.3 V, unless otherwise specified
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Optimized Accuracy Range IP–12.5 – 12.5 A
Sensitivity Sens
Over full range of IP–110 – mV/A
Full scale of IP applied for 5 ms, TA = –40°C to 25°C – 110 – mV/A
Full scale of IP applied for 5 ms, TA = 25°C to 85°C – 110 – mV/A
Noise
[1] VNOISE TA = 25 °C, no external low pass filter on VIOUT – 11 – mV
Electrical Offset Voltage
VOE(TA) IP = 0 A, TA = 25°C – ±5 – mV
VOE(TOP)HT IP = 0 A, TA = 25°C to 85°C – ±40 – mV
VOE(TOP)LT IP = 0 A, TA = –40°C to 25°C – ±50 – mV
Total Output Error
[3] ETOT IP = ±12.5 A,TA = –40°C to 85°C – ±5 – %
[1] See Characteristic Performance Data for parameter distributions over temperature.
[2] ±3 sigma noise voltage.
[3] Percentage of IP, with IP = ±12.5 A.
x12AB PERFORMANCE CHARACTERISTICS for LC package and K Temperature Range
[1]
TA = 25°C and VCC = 3.3 V, unless otherwise specified
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Optimized Accuracy Range IP–12.5 – 12.5 A
Sensitivity Sens
Over full range of IP–110 – mV/A
Full scale of IP applied for 5 ms, TA = –40°C to 25°C – 110 – mV/A
Full scale of IP applied for 5 ms, TA = 25°C to 125°C – 110 – mV/A
Noise
[2] VNOISE TA = 25 °C, no external low pass filter on VIOUT – 11 – mV
Electrical Offset Voltage
VOE(TA) IP = 0 A, TA = 25°C – ±5 – mV
VOE(TOP)HT IP = 0 A, TA = 25°C to 125°C – ±40 – mV
VOE(TOP)LT IP = 0 A, TA = –40°C to 25°C – ±50 – mV
Total Output Error
[3] ETOT IP = ±12.5 A,TA = –40°C to 125°C – ±5 – %
[1] See Characteristic Performance Data for parameter distributions over temperature.
[2] ±3 sigma noise voltage.
[3] Percentage of IP, with IP = ±12.5 A.
x15AB PERFORMANCE CHARACTERISTICS
[1]
TA = 25°C and VCC = 3.3 V, unless otherwise specified
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Optimized Accuracy Range IP–15.5 – 15.5 A
Sensitivity Sens Across full range of IP– 90 – mV/A
Noise
[2] VNOISE No external low pass filter on VIOUT – 11 – mV
Electrical Offset Voltage
VOE(TA) IP = 0 A – ±5 – mV
VOE(TOP)HT IP = 0 A, TA = 25°C to TA(max) – ±40 – mV
VOE(TOP)LT IP = 0 A, TA = –40°C to 25°C – ±50 – mV
Total Output Error
[3] ETOT IP = ±12.5 A,TA = –40°C to TA(max) – ±5 – %
[1] See Characteristic Performance Data for parameter distributions across the full temperature range.
[2] ±3 sigma noise voltage.
[3] Percentage of IP, with IP = ±15.5 A.
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
6
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
x25AB PERFORMANCE CHARACTERISTICS for LC package and K Temperature Range
[1]
TA = 25°C and VCC = 3.3 V, unless otherwise specified
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Optimized Accuracy Range IP–25 – 25 A
Sensitivity Sens
Over full range of IP– 55 – mV/A
Full scale of IP applied for 5 ms, TA = –40°C to 25°C – 55 – mV/A
Full scale of IP applied for 5 ms, TA = 25°C to 125°C – 55 – mV/A
Noise
[2] VNOISE TA = 25 °C, no external low pass filter on VIOUT – 8 – mV
Electrical Offset Voltage
VOE(TA) IP = 0 A, TA = 25°C – ±5 – mV
VOE(TOP)HT IP = 0 A, TA = 25°C to 125°C – ±30 – mV
VOE(TOP)LT IP = 0 A, TA = –40°C to 25°C – ±35 – mV
Total Output Error
[3] ETOT IP =±25 A, TA = –40°C to 125°C – ±4 – %
[1] See Characteristic Performance Data for parameter distributions over temperature.
[2] ±3 sigma noise voltage.
[3] Percentage of IP, with IP = ±25 A.
x25AB PERFORMANCE CHARACTERISTICS for for LC package and E Temperature Range
[1]
TA = 25°C and VCC = 3.3 V, unless otherwise specified
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Optimized Accuracy Range IP–25 – 25 A
Sensitivity Sens
Over full range of IP– 55 – mV/A
Full scale of IP applied for 5 ms, TA = –40°C to 25°C – 55 – mV/A
Full scale of IP applied for 5 ms, TA = 25°C to 85°C – 55 – mV/A
Noise
[2] VNOISE TA = 25 °C, no external low pass filter on VIOUT – 8 – mV
Electrical Offset Voltage
VOE(TA) IP = 0 A, TA = 25°C – ±5 – mV
VOE(TOP)HT IP = 0 A, TA = 25°C to 85°C – ±30 – mV
VOE(TOP)LT IP = 0 A, TA = –40°C to 25°C – ±35 – mV
Total Output Error
[3] ETOT IP =±25 A, TA = –40°C to 85°C – ±4 – %
[1] See Characteristic Performance Data for parameter distributions over temperature.
[2] ±3 sigma noise voltage.
[3] Percentage of IP, with IP = ±25 A.
x31AB PERFORMANCE CHARACTERISTICS
[1]
TA = 25°C and VCC = 3.3 V, unless otherwise specified
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Optimized Accuracy Range IP–31 – 31 A
Sensitivity Sens Across full range of IP– 45 – mV/A
Noise
[2] VNOISE No external low pass filter on VIOUT – 8 – mV
Electrical Offset Voltage
VOE(TA) IP = 0 A – ±5 – mV
VOE(TOP)HT IP = 0 A, TA = 25°C to TA(max) – ±30 – mV
VOE(TOP)LT IP = 0 A, TA = –40°C to 25°C – ±35 – mV
Total Output Error
[3] ETOT IP =±25 A, TA = –40°C to TA(max) – ±4 – %
[1] See Characteristic Performance Data for parameter distributions across the full temperature range.
[2] ±3 sigma noise voltage.
[3] Percentage of IP, with IP = ±31 A.
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
7
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
THERMAL CHARACTERISTICS
Characteristic Symbol Test Conditions
[1] Value Units
Package Thermal Resistance,
Junction to Lead RθJL
LC package, mounted on Allegro ASEK 711 evalua-
tion board 5 °C/W
Package Thermal Resistance,
Junction to Ambient [2] RθJA
LC package, mounted on Allegro 85-0404 evaluation
board, includes the power consumed by the board 23 °C/W
EX package, mounted on Allegro 85-0528 evaluation
board, includes the power consumed by the board 24 °C/W
[1] Additional thermal information available on the Allegro website.
[2] The Allegro evaluation board has 1500 mm2 of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal
vias connecting 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.
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
8
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Characteristic Performance Data
Data taken using the ACS711KEX-15A, VCC = 3.3 V
1580
1600
1620
1640
1660
1680
1700
1720
-60 -40 -20 0 20 40 60 80 100 120 140
QVO (mV)
TA(°C)
QVO versus Ambient Temperature
-60
-40
-20
0
20
40
60
-60 -40 -20 0 20 40 60 80 100 120 140
VOE (mV)
TA(°C)
QVO Error versus Ambient Temperature
82
84
86
88
90
92
94
-60 -40 -20 0 20 40 60 80 100 120 140
Sensitivity (mV/A)
TA(°C)
Sensitivity versus Ambient Temperature
-10
-8
-6
-4
-2
0
2
4
6
-60 -40 -20 0 20 40 60 80 100 120 140
ETOT (%)
TA(°C)
Total Error versus Ambient Temperature
99.6
99.7
99.8
99.9
100
100.1
100.2
100.3
100.4
100.5
-60 -40 -20 0 20 40 60 80 100 120 140
ESYM(%)
TA(°C)
Symmetry versus Ambient Temperature
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
-60 -40 -20 0 20 40 60 80 100 120 140
ELIN (%)
TA(°C)
Nonlinearity versus Ambient Temperature
Mean
Typical Maximum Limit Typical Minimum Limit
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
9
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Characteristic Performance Data
Data taken using the ACS711KEX-31AB, VCC = 3.3 V
1600
1610
1620
1630
1640
1650
1660
1670
1680
1690
1700
-60 -40 -20 0 20 40 60 80 100 120 140
QVO(mV)
TA (°C)
QVO versus Ambient Temperature
-50
-40
-30
-20
-10
0
10
20
30
40
50
-60 -40 -20 0 20 40 60 80 100 120 140
QVO Error versus Ambient Temperature
40
41
42
43
44
45
46
47
48
49
50
-60 -40 -20 0 20 40 60 80 100 120 140
Sensitivity versus Ambient Temperature
-15
-10
-5
0
5
10
15
-60 -40 -20 0 20 40 60 80 100 120 140
ETOT(%)
99
99.2
99.4
99.6
99.8
100
100.2
100.4
100.6
100.8
101
-60 -40 -20 0 20 40 60 80 100 120 140
ESYM(%)
Symmetry versus Ambient Temperature
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
-60 -40 -20 0 20 40 60 80 100 120 140
ELIN(%)
Total Error versus Ambient Temperature
Nonlinearity versus Ambient Temperature
Mean
Typical Maximum Limit Typical Minimum Limit
TA (°C)
TA (°C) TA (°C)
TA (°C) TA (°C)
Sensitivity (mV/A)
VOE (mV)
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
10
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Characteristic Performance Data
Data taken using the ACS711KLC-12A, VCC = 3.3 V
Mean
Typical Maximum Limit Typical Minimum Limit
80
60
40
20
0
-20
-40
-60
–60 60 14080 100 120–40 40–20 200
–60 60 14080 100 120–40 40–20 200
–60 60 14080 100 120–40 40–20 200
–60 60 14080 100 120–40 40–20 200
–60 60 14080 100 120–40 40–20 200
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
114
113
112
111
110
109
108
107
101.5
101.0
100.5
100.0
99.5
99.0
98.5
VOE (mV)ELIN (%)
Sens (mV/A)ESYM (%)
T
A
(°C)T
A
(°C)
T
A
(°C)T
A
(°C)
8
6
4
2
0
-2
-4
-6
ETOT (%)
T
A
(°C)
IFAULT(A)
T
A
(°C)
16
14
12
10
8
6
4
2
0
–60 60 14080 100 120–40 40–20 200
Electrical Offset Voltage versus Ambient Temperature
Nonlinearity versus Ambient Temperature
Sensitivity versus Ambient Temperature
Symmetry versus Ambient Temperature
Total Output Error versus Ambient Temperature Fault Operating Point versus Ambient Temperature
Accuracy Data
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
11
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Characteristic Performance Data
Data taken using the ACS711KLC-25A, VCC = 3.3 V
Accuracy Data
Mean
Typical Maximum Limit Typical Minimum Limit
40
30
20
10
0
-10
-20
-30
-40
–60 60 14080 100 120–40 40–20 200
–60 60 14080 100 120–40 40–20 200
–60 60 14080 100 120–40 40–20 200
–60 60 14080 100 120–40 40–20 200
–60 60 14080 100 120–40 40–20 200
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
57.0
56.5
56.0
55.5
55.0
54.5
54.0
53.5
100.8
100.6
100.4
100.2
100.0
99.8
99.6
99.4
99.2
99.0
VOE (mV)ELIN (%)
Sens (mV/A)ESYM (%)
T
A
(°C)T
A
(°C)
T
A
(°C)T
A
(°C)
5
4
3
2
1
0
-1
-2
-3
-4
ETOT (%)
T
A
(°C)
IFAULT (A)
T
A
(°C)
30
25
20
15
10
5
0
–60 60 14080 100 120–40 40–20 200
Electrical Offset Voltage versus Ambient Temperature
Nonlinearity versus Ambient Temperature
Sensitivity versus Ambient Temperature
Symmetry versus Ambient Temperature
Total Output Error versus Ambient Temperature Fault Operating Point versus Ambient Temperature
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
12
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Characteristic Performance Data
Data taken using the ACS711KLC-25A
Timing Data
IP (10 A/div.)
3.47 µs
VIOUT (0.5 V/div.)
t (2 µs/div.)
IP (10 A/div.) IP (10 A/div.)
VIOUT (0.5 V/div.)
Fault (2 V/div.)
t (2 µs/div.) t (2 µs/div.)
IP (10 A/div.)
VIOUT (0.5 V/div.)
t (2 µs/div.)
4.62 µs
1.28 µs
1.24 µs
Response Time
Propagation Delay Time
Fault Response
Rise Time
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
13
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Sensitivity (Sens). The change in sensor output in response to a
1 A change through the primary conductor. The sensitivity is the
product of the magnetic circuit sensitivity (G / A) and the linear
IC amplifier gain (mV/G). The linear IC amplifier gain is pro-
grammed at the factory to optimize the sensitivity (mV/A) for the
full-scale current of the device.
Noise (VNOISE). The product of the linear IC amplifier gain (mV)
and the noise floor for the Allegro Hall effect linear IC. The noise
floor is derived from the thermal and shot noise observed in Hall
elements. Dividing the noise (mV) by the sensitivity (mV/A) pro-
vides the smallest current that the device is able to resolve.
Linearity (ELIN). The degree to which the voltage output from
the sensor varies in direct proportion to the primary current
through its full-scale amplitude. Nonlinearity in the output can be
attributed to the saturation of the flux concentrator approaching
the full-scale current. The following equation is used to derive the
linearity:
100 1–
[{
[{
VIOUT_full-scale amperes – VIOUT(Q)
∆ gain × % sat ( )
2 (VIOUT_half-scale amperes – VIOUT(Q) )
where VIOUT_full-scale amperes = the output voltage (V) when the
sensed current approximates full-scale ±IP .
Symmetry (ESYM). The degree to which the absolute voltage
output from the sensor varies in proportion to either a positive
or negative full-scale primary current. The following formula is
used to derive symmetry:
100
VIOUT_+ full-scale amperes – VIOUT(Q)
VIOUT(Q) – VIOUT_–full-scale amperes
Quiescent output voltage (VIOUT(Q)). The output of the sensor
when the primary current is zero. For a unipolar supply voltage,
it nominally remains at VCC ⁄ 2. Thus, VCC = 3.3 V translates
into VIOUT(Q) = 1.65 V. Variation in VIOUT(Q) can be attributed to
the resolution of the Allegro linear IC quiescent voltage trim and
thermal drift.
Electrical offset voltage (VOE). The deviation of the device out-
put from its ideal quiescent value of VCC / 2 due to nonmagnetic
causes. To convert this voltage to amperes, divide by the device
sensitivity, Sens.
Accuracy (ETOT). The accuracy represents the maximum devia-
tion of the actual output from its ideal value. This is also known
as the total ouput error. The accuracy is illustrated graphically in
the output voltage versus current chart below.
Ratiometry. The ratiometric feature means that its 0 A output,
VIOUT(Q), (nominally equal to VCC/2) and sensitivity, Sens, are
proportional to its supply voltage, VCC
. The following formula is
used to derive the ratiometric change in 0 A output voltage,
ΔVIOUT(Q)RAT (%):
The ratiometric change in sensitivity, ΔSensRAT (%), is defined as:
DEFINITIONS OF ACCURACY CHARACTERISTICS
100
VIOUT(Q)VCC / VIOUT(Q)3.3V
VCC / 3.3 V
100
SensVCC / Sens3.3V
VCC / 3.3 V
Output Voltage versus Sensed Current
Accuracy at 0 A and at Full-Scale Current
Increasing VIOUT
(V)
+IP (A)
Accuracy
Accuracy
Accuracy
25°C Only
Accuracy
25°C Only
Accuracy
25°C Only
Accuracy
0 A
v rO e ∆Temp erature
Average
VIOUT
–IP (A)
v rO e ∆Temp erature
v rO e ∆Temp erature
Decreasing VIOUT
(V)
IP(min)
IP(max)
Full Scale
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
14
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS
Primary Current
Transducer Output
90
10
0
I (%)
Rise Time, tr
t
Rise time (tr). The time interval between a) when the sensor
reaches 10% of its full scale value, and b) when it reaches 90%
of its full scale value. The rise time to a step response is used to
derive the bandwidth of the current sensor, in which ƒ(–3 dB) =
0.35 / tr. Both tr and tRESPONSE are detrimentally affected by eddy
current losses observed in the conductive IC ground plane.
Power-On Time (tPO). When the supply is ramped to its operat-
ing voltage, the device requires a finite time to power its internal
components before responding to an input magnetic field.
Power-On Time, tPO , is defined as the time it takes for the output
voltage to settle within ±10% of its steady state value under an
applied magnetic field, after the power supply has reached its
minimum specified operating voltage, VCC(min), as shown in the
chart at right.
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
15
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
APPLICATION INFORMATION
Layout
To optimize thermal and electrical performance, the following
features should be included in the printed circuit board:
• The primary leads should be connected to as much copper area
as is available.
• The copper should be 2 oz. or heavier.
• Additional layers of the board should be used for conducting the
primary current if possible, and should be connected using the
arrangement of vias shown below.
• The two solder pads at the ends of the exposed pad loop should
be placed directly on the copper trace that conducts the primary
current.
• When using vias under exposed pads, such as with the EX pack-
age, using plugged vias prevents wicking of the solder from the
pad into the via during reflow. Whether or not to use plugged
vias should be evaluated in the application.
Primary Current Trace
Via
Solder pads
Via under pad
Signal traces
Exposed pad loop
EX package
footprint
Primary Current Trace
Suggested Layout. EX package shown.
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
16
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Package LC, 8-pin SOIC
C
SEATING
PLANE
1.27 BSC
GAUGE PLANE
SEATING PLANE
ATerminal #1 mark area
B
Reference land pattern layout (reference IPC7351
SOIC127P600X175-8M); all pads a minimum of 0.20 mm from all
adjacent pads; adjust as necessary to meet application process
requirements and PCB layout tolerances
B
D
C
21
8
Branding scale and appearance at supplier discretion
C
SEATING
PLANE
C0.10
8X
0.25 BSC
1.04 REF
1.75 MAX
For Reference Only; not for tooling use (reference MS-012AA)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
4.90 ±0.10
3.90 ±0.10 6.00 ±0.20
0.51
0.31 0.25
0.10
0.25
0.17
1.27
0.40
8°
0°
N = Device part number
T = Device temperature range
P = Package Designator
A = Amperage
L = Lot number
Belly Brand = Country of Origin
NNNNNNN
LLLLL
1
TPP-AAA
A
Standard Branding Reference View
21
8
PCB Layout Reference View
C
0.65 1.27
5.60
1.75
Branded Face
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
17
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Package EX, 12-Contact QFN
With Fused Sensed Current Loop
0.30
Branded Face
1.00
1
12
0.50
0.70
0.85
1.27
MIN
0.80
MIN
2.90
2.05 REF
2.70
C
C
SEATING
PLANE
0.25 +0.05
–0.07
0.40±0.10
0.50 BSC 0.75 ±0.05
3.00 BSC
3.00 BSC
D
DCoplanarity includes exposed current path and terminals
B
ATerminal #1 mark area
BFused sensed current path
For reference only, not for tooling use (reference JEDEC MO-220WEED
except for fused current path)
Dimensions in millimeters
Exact case and lead configuration at supplier discretion within limits shown
CReference land pattern layout (reference IPC7351
QFN50P300X300X80-17W4M);
All pads a minimum of 0.20 mm from all adjacent pads; adjust as
necessary to meet application process requirements and PCB layout
tolerances; when mounting on a multilayer PCB, thermal vias at the
exposed thermal pad land can improve thermal dissipation (reference
EIA/JEDEC Standard JESD51-5)
12
0.20
1.79
2
1
A
12
1
2
PCB Layout Reference View
C0.08
9X
Branding scale and appearance at supplier discretion
E
EStandard Branding Reference View
N = Device part number
Y = Last two digits of year of manufacture
W = Week of manufacture
L
= Lot number
NNNN
YYWW
LLLL
1
Hall-Effect Linear Current Sensor with
Overcurrent Fault Output for < 100 V Isolation Applications
ACS711
18
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Revision History
Number Date Description
2 July 18, 2013 Update characteristics tables references
3 February 6, 2015 Revised NC description in Terminal List Table
4 June 23, 2017
Added ACS711KEX-15A and ACS711KEX-31AB characteristic performance data plots;
Revised product status of ACS711EEXLT-15AB-T and ACS711EEXLT-31AB-T variants to
Pre-End-of-Life.
For the latest version of this document, visit our website:
www.allegromicro.com
Copyright ©2017, Allegro MicroSystems, LLC
Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
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.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
