Not to scale
The Allegro™ ACS718 current sensor IC is an economical, high
isolation solution for AC or DC current sensing in industrial,
commercial, and communications systems. The small package is
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. 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 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
applications without the use of high-side differential amplifiers
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. 4
MCO-0000164
• 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
• Low, 350 μARMS/√Hz noise density results in typical
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
CBYPASS
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–
+IP
–IP
IP
NC
GND
NC
NC
VIOUT
NC
VCC
NC
The ACS718 outputs an
analog signal, VIOUT , that
changes, proportionally,
with the bidirectional AC
or DC primary sensed
current, IP , within the
specied measurement
range.
ACS718
FEATURES AND BENEFITS DESCRIPTION
Package: 16-Pin SOICW (suffix MA)
CB Certicate Number:
US-32210-M1-UL
TÜV America
Certificate Number:
U8V 16 03 54214 040
CB 16 03 54214 039
May 21, 2019
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
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 25 V
Reverse Output Voltage VRIOUT –0.1 V
Operating Ambient Temperature TARange K –40 to 125 °C
Junction Temperature TJ(max) 165 °C
Storage Temperature Tstg –65 to 165 °C
SELECTION GUIDE
Part Number IP
(A)
Sens(Typ)
at VCC = 5.0 V
(mV/A)
TA
(°C) Packing [1]
ACS718KMATR-10B-T [2] ±10 200 –40 to 125 Tape and reel, 1000 pieces per reel
ACS718KMATR-20B-T [2] ±20 100
[1] Contact Allegro for additional packing options.
[2] Varient not intended for automotive applications.
SPECIFICATIONS
ISOLATION CHARACTERISTICS
Characteristic Symbol Notes Rating Unit
Dielectric Strength Test Voltage VISO
Agency type tested for 60 seconds per IEC/UL 60950-1 (2nd
Edition). Production tested for 1 second at 3000 VRMS in
accordance with IEC/UL 60950-1 (2nd Edition).
4800 VRMS
Working Voltage for Basic Isolation VWVBI
Maximum approved working voltage for basic (single) isolation
according IEC/UL 60950-1 (2nd Edition)
1550 VPK
1097 VRMS or
VDC
Working Voltage for Reinforced Isolation VWVRI
Maximum approved working voltage for reinforced isolation
according to IEC/UL 60950-1 (2nd Edition)
800 VPK
565 VRMS or
VDC
Clearance Dcl Minimum distance through air from IP leads to signal leads. 7.5 mm
Creepage [3] Dcr Minimum distance along package body from IP leads to signal
leads. 8.2 mm
[3] In order to maintain this creepage in applications, the user should add a slit in the PCB under the package. Otherwise, the pads on the PCB will reduce the creepage.
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
3
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Functional Block Diagram
Package MA, 16-Pin
SOICW
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
GND
NC
NC
VIOUT
NC
VCC
NC
IP+
IP+
IP+
IP+
IP–
IP–
IP–
IP–
Terminal List
Number Name Description
1, 2, 3, 4 IP+ Terminals for current being sensed; fused internally
5, 6, 7, 8 IP– Terminals for current being sensed; fused internally
9, 16 NC No internal connection; recommended to be left unconnected in order to maintain
high creepage.
11, 13. 14 NC No internal connection; recommended to connect to GND for the best ESD
performance
10 VCC Device power supply terminal
12 VIOUT Analog output signal
15 GND Signal ground terminal
VCC
VIOUT
GND
IP+
IP+
IP−
IP−
Power-on
Reset
Master Current
Supply To all subcircuits
Hall Current
Drive
CLOAD
CBYP
VCC
Offset and
Offset TC
Sensitivity and
Dynamic Offset
Cancellation
Tuned Filter
Sensitivity TC
Pinout Diagram and Terminal List Table
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
4
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
COMMON ELECTRICAL CHARACTERISTICS [1]: TA Range K, valid at TA = – 40°C to 125°C, VCC
= 5 V,
unless otherwise specied
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Supply Voltage VCC 4.5 5 5.5 V
Supply Current ICC VCC = 5 V, output open –79mA
Output Capacitance Load CLVIOUT to GND ––1nF
Output Resistive Load RLVIOUT to GND 15 – – kΩ
Primary Conductor Resistance RPTA = 25°C – 0.85 – mΩ
Rise Time trIP = IP(max), TA = 25°C, CL = open – 10 – μs
Magnetic Coupling Factor CF– 4.5 – G/A
Propagation Delay tpd IP = IP(max), TA = 25°C, CL = open –5–μs
Response Time tRESPONSE IP = IP(max), TA = 25°C, CL = open – 13 – μs
Internal Bandwidth BWi Small signal –3 dB – 40 – kHz
Noise Density IND Input referenced noise density;
TA = 25°C, CL = 1 nF – 350 – µA(rms)/
√Hz
Noise INInput referenced noise; BWi = 40 kHz,
TA = 25°C, CL = 1 nF – 70 – mA(rms)
Nonlinearity ELIN Across full range of IP– ±1 – %
Saturation Voltage [2] VOH RL = RL(min) VCC – 0.3 – – V
VOL RL = RL(min) – – 0.3 V
Power-On Time tPO Output reaches 90% of steady-state
level, TA = 25°C, IP = IP(max) – 35 – μs
[1] Device may be operated at higher primary current levels, IP , ambient temperatures, TA , and internal leadframe temperatures, provided the Maximum Junction Tempera-
ture, TJ(max), is not exceeded.
[2] The sensor IC will continue to respond to current beyond the range of IP until the high or low saturation voltage; however, the nonlinearity in this region will be worse than
through the rest of the measurement range.
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
5
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
xKMATR-10B PERFORMANCE CHARACTERISTICS: Valid at TA = – 40°C to 125°C, VCC = 5 V,
unless otherwise specied
Characteristic Symbol Test Conditions Min. Typ. [1] Max. Units
NOMINAL PERFORMANCE
Current Sensing Range IPR –10 – 10 A
Sensitivity Sens IPR
(min) < IP < IPR
(max) – 200 – mV/A
Zero Current Output Voltage VIOUT(Q) Bidirectional; IP = 0 A – VCC ×
0.5 – V
ACCURACY PERFORMANCE
Total Output Error [2] ETOT
IP = IPR(max); TA = 25°C –5 ±2 5 %
IP = IPR(max); TA = 85°C – ±2 – %
IP =IPR(max); TA = 125°C – ±4 – %
IP = IPR(max); TA = –40°C – ±4 – %
TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE/(Sens x IP)
Sensitivity Error ESENS
TA = 25°C; measured at IP = IPR(max) –4 ±2 4 %
TA = 85°C; measured at IP = IPR(max) – ±2 – %
TA = 125°C; measured at IP = IPR(max) – ±3 – %
TA = –40°C; measured at IP = IPR(max) – ±4 – %
Offset Voltage [4] VOE
TA = 25°C; IP = 0 A –40 ±10 40 mV
TA = 85°C; IP = 0 A – ±15 – mV
TA = 125°C; IP = 0 A – 10 ±20 – mV
TA = –40°C; IP = 0 A – ±25 – mV
LIFETIME DRIFT CHARACTERISTICS
Sensitivity Error Lifetime Drift ESENS_
DRIFT – ±2 – %
Total Output Error Lifetime Drift ETOT_DRIFT – ±2 – %
[1] Typical values with ± are 3 sigma values.
[2] Percentage of IP
, with IP = IPR (max) .
[3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum o󰀨set voltage, as that would violate the maximum/minimum total output
error specication. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section.
[4] O󰀨set Voltage does not incorporate any error due to external magnetic elds. See section: Impact of External Magnetic Fields.
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
6
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
xKMATR-20B PERFORMANCE CHARACTERISTICS: Valid at TA = – 40°C to 125°C, VCC = 5 V,
unless otherwise specied
Characteristic Symbol Test Conditions Min. Typ. [1] Max. Units
NOMINAL PERFORMANCE
Current Sensing Range IPR –20 – 20 A
Sensitivity Sens IPR
(min) < IP < IPR
(max) – 100 – mV/A
Zero Current Output Voltage VIOUT(Q) Bidirectional; IP = 0 A – VCC ×
0.5 – V
ACCURACY PERFORMANCE
Total Output Error [2] ETOT
IP = IPR(max); TA = 25°C –5 ±2 5 %
IP = IPR(max); TA = 85°C – 1 ±2 – %
IP =IPR(max); TA = 125°C – 2 ±3 – %
IP = IPR(max); TA = –40°C – ±3 – %
TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE/(Sens x IP)
Sensitivity Error ESENS
TA = 25°C; measured at IP = IPR(max) –4 ±2 4 %
TA = 85°C; measured at IP = IPR(max) – 1 ±2 – %
TA = 125°C; measured at IP = IPR(max) – 2 ±3 – %
TA = –40°C; measured at IP = IPR(max) – ±3 – %
Offset Voltage [4] VOE
TA = 25°C; IP = 0 A; –40 ±8 40 mV
TA = 85°C; IP = 0 A; – ±10 – mV
TA = 125°C; IP = 0 A; – ±15 – mV
TA = –40°C; IP = 0 A – ±15 – mV
LIFETIME DRIFT CHARACTERISTICS
Sensitivity Error Lifetime Drift ESENS_
DRIFT – ±2 – %
Total Output Error Lifetime Drift ETOT_DRIFT – ±2 – %
[1] Typical values with ± are 3 sigma values.
[2] Percentage of IP
, with IP = IPR (max) .
[3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum o󰀨set voltage, as that would violate the maximum/minimum total output
error specication. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section.
[4] O󰀨set Voltage does not incorporate any error due to external magnetic elds. See section: Impact of External Magnetic Fields.
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
7
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
CHARACTERISTIC PERFORMANCE
Zero Current Output Voltage vs. Temperature
Offset Voltage vs. Temperature
Sensitivity vs. Temperature
Nonlinearity vs. Temperature Total Error at I vs. Temperature
PR(max)
Sensitivity Error vs. Temperature
30
20
10
0
-10
-20
-30
-50 -25 025 50 75 100 125
Temperature (ºC)
Offset Voltage (mV)
-50 -25 025 50 75 100 125
Temperature (ºC)
2470
2480
2500
2490
2510
2520
2530
2540
V (mV)
IOUT(Q)
-50 -25 025 50 75 100 125
Temperature (ºC)
190
192
194
196
198
200
202
204
206
208
Sensitivity (mV/A)
-50 -25 025 50 75 100 125
Temperature (ºC)
Sensitivity Error (%)
-5.00
-4.00
-3.00
-2.00
-1.00
0.00
1.00
2.00
3.00
4.00
-50 -25 025 50 75 100 125
Temperature (ºC)
Total Error (%)
-5.00
-4.00
-3.00
-2.00
-1.00
0.00
1.00
2.00
3.00
4.00
5.00
-50 -25 025 50 75 100 125
Temperature (ºC)
Nonlinearity (%)
-0.40
-0.20
0.00
0.40
0.60
0.80
+3 Sigma Average -3 Sigma
0.20
-0.60
-0.80
40
xKMATR-10B Key Parameters
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
8
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Zero Current Output Voltage vs. Temperature
Offset Voltage vs. Temperature
Sensitivity vs. Temperature
Nonlinearity vs. Temperature Total Error at I vs. Temperature
PR(max)
Sensitivity Error vs. Temperature
20
15
10
0
5
-10
-5
-15
-50 -25 025 50 75 100 125
Temperature (ºC)
Offset Voltage (mV)
-50 -25 025 50 75 100 125
Temperature (ºC)
2485
2490
2495
2500
2505
2510
2515
2520
V (mV)
IOUT(Q)
-50 -25 025 50 75 100 125
Temperature (ºC)
104
99
98
97
96
100
101
102
103
105
Sensitivity (mV/A)
-50 -25 025 50 75 100 125
Temperature (ºC)
Sensitivity Error (%)
-3.00
-4.00
-2.00
-1.00
0.00
1.00
2.00
3.00
4.00
5.00
-50 -25 025 50 75 100 125
Temperature (ºC)
Total Error (%)
-5.00
-3.00
-2.00
-1.00
0.00
1.00
2.00
3.00
4.00
-50 -25 025 50 75 100 125
Temperature (ºC)
Nonlinearity (%)
-0.40
-0.20
-0.30
-0.10
0.00
0.00
0.20
0.30
0.50
0.40
0.60
+3 Sigma Average -3 Sigma
xKMATR-20B Key Parameters
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
9
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Sensitivity (Sens). The change in sensor IC output in response to
a 1 A change through the primary conductor. The sensitivity is the
product of the magnetic circuit sensitivity (G / A) (1 G = 0.1 mT)
and the linear IC amplifier gain (mV/G). The linear IC ampli-
fier gain is programmed at the factory to optimize the sensitivity
(mV/A) for the full-scale current of the device.
Nonlinearity (ELIN). The nonlinearity is a measure of how linear
the output of the sensor IC is over the full current measurement
range. The nonlinearity is calculated as:
100 1–
[{
[{
VIOUT_full-scale amperes – VIOUT(Q)
∆ gain × % sat ( )
2 (VIOUT_half-scale amperes – VIOUT(Q) )
where VIOUT(IPR(max)) is the output of the sensor IC with the
maximum measurement current flowing through it and
VIOUT(IPR(max)/2) is the output of the sensor IC with half of the
maximum measurement current flowing through it.
Zero Current Output Voltage (VIOUT(Q)). The output of the
sensor when the primary current is zero. For a unipolar supply
voltage, it nominally remains at at 0.5 × VCC for a bidirectional
device and 0.1 × VCC for a unidirectional device. For example,
in the case of a bidirectional output device, VCC = 5 V translates
into VIOUT(Q) = 2.5 V. Variation in VIOUT(Q) can be attributed to
the resolution of the Allegro linear IC quiescent voltage trim and
thermal drift.
Offset Voltage (VOE). The deviation of the device output from
its ideal quiescent value of 0.5 × VCC (bidirectional) or 0.1 × VCC
(unidirectional) due to nonmagnetic causes. To convert this volt-
age to amperes, divide by the device sensitivity, Sens.
Total Output Error (ETOT). The the difference between the cur-
rent measurement from the sensor IC and the actual current (IP),
relative to the actual current. This is equivalent to the difference
between the ideal output voltage and the actual output voltage,
divided by the ideal sensitivity, relative to the current flowing
through the primary conduction path:
E
TOT
(I
P
)
V
IOUT_ideal
(I
P
) – V
IOUT
(I
P
)
Sens
ideal
(I
P
)
×
I
P
×
100 (%)=
The Total Output Error incorporates all sources of error and is a
function of IP . At relatively high currents, ETOT will be mostly
due to sensitivity error, and at relatively low currents, ETOT will
be mostly due to Offset Voltage (VOE
). In fact, at IP = 0, ETOT
approaches infinity due to the offset. This is illustrated in figures
1 and 2. Figure 1 shows a distribution of output voltages versus IP
at 25°C and across temperature. Figure 2 shows the correspond-
ing ETOT versus IP .
DEFINITIONS OF ACCURACY CHARACTERISTICS
Figure 1: Output Voltage versus Sensed Current
Figure 2: Total Output Error versus Sensed Current
0 A
Decreasing
VIOUT (V)
Accuracy Across
Temperature
Accuracy Across
Temperature
Accuracy Across
Temperature
Accuracy at
25°C Only
Accuracy at
25°C Only
Accuracy at
25°C Only
Increasing
VIOUT (V)
Ideal VIOUT
IPR(min)
IPR(max)
+IP (A)
–IP (A)
VIOUT(Q)
Full Scale IP
+I
P
–I
P
+E
TOT
–E
TOT
Across Temperature
25°C Only
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
10
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
APPLICATION INFORMATION
Impact of External Magnetic Fields
The ACS718 works by sensing the magnetic field created by the
current flowing through the package. However, the sensor cannot
differentiate between fields created by the current flow and exter-
nal magnetic fields. This means that external magnetic fields can
cause errors in the output of the sensor. Magnetic fields which are
perpendicular to the surface of the package affect the output of
the sensor, as it only senses fields in that one plane. The error in
Amperes can be quantified as:
Error(B) =
B
C
F
where B is the strength of the external field perpendicular to the
surface of the package in Gauss, and CF is the coupling factor in
G/A. Then, multiplying by the sensitivity of the part (Sens) gives
the error in mV.
For example, an external field of 1 Gauss will result in around
0.22 A of error. If the ACS718KMATR-10B, which has a nominal
sensitivity of 200 mV/A, is being used, that equates to 44 mV of
error on the output of the sensor.
Table 1: External Magnetic Field (Gauss) Impact
External Field
(Gauss) Error (A) Error (mV)
10B 20B
0.5 0.11 22 11
1 0.22 44 22
2 0.44 88 44
Estimating Total Error vs. Sensed Current
The Performance Characteristics tables give distribution (±3
sigma) values for Total Error at IPR(max); however, one often
wants to know what error to expect at a particular current. This
can be estimated by using the distribution data for the compo-
nents of Total Error, Sensitivity Error, and Offset Voltage. The
±3 sigma value for Total Error (ETOT) as a function of the sensed
current (IP) is estimated as:
E(I) =
TOTP
100 × VOE
Sens × IP
E+
SENS
2()
2
Here, ESENS and VOE are the ±3 sigma values for those error
terms. If there is an average sensitivity error or average offset
voltage, then the average Total Error is estimated as:
Sens × IP
E(I) = E+
TOTP SENS
AVGAVG
100 × V
OEAVG
The resulting total error will be a sum of ETOT and ETOT_AVG.
Using these equations and the 3 sigma distributions for Sensitiv-
ity Error and Offset Voltage, the Total Error vs. sensed current
(IP) is below for the ACS718KMATR-20B. As expected, as one
goes towards zero current, the error in percent goes towards infin-
ity due to division by zero (refer to Figure 3).
8
-2
6
-4
4
-6
2
-8
0
0246810 12 14 1816 20
-40C+3sig
-40C-3sig
25C+3sig
25C-3sig
125C+3sig
125C-3sig
Current (A)
Total Error (% of current measured)
Figure 3: Predicted Total Error as a Function of Sensed
Current for the ACS718KMATR-20B
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
11
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS
VIOUT
V
t
VCC
VCC(min.)
90% VIOUT
0
t1= time at which power supply reaches
minimum specified operating voltage
t2=
time at which output voltage settles
within ±10% of its steady state value
under an applied magnetic field
t1t2
tPO
V
CC
(typ.)
Primary Current
VIOUT
90
0
(%)
Response Time, tRESPONSE
t
Primary Current
V
IOUT
90
10
20
0
(%)
Propagation Delay, tpd
Rise Time, tr
t
Power-On Time (tPO)
When the supply is ramped to its operating 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.
Rise Time (tr)
The time interval between a) when the sensor IC reaches 10% of
its full scale value, and b) when it reaches 90% of its full scale
value.
Propagation Delay (tpd
)
The propagation delay is measured as the time interval a) when
the primary current signal reaches 20% of its final value, and b)
when the device reaches 20% of its output corresponding to the
applied current.
Response Time (tRESPONSE)
The time interval between a) when the primary current signal
reaches 90% of its final value, and b) when the device reaches
90% of its output corresponding to the applied current.
Figure 4: Power-On Time (tPO)
Figure 5: Rise Time (tr) and Propagation Delay (tpd)
Figure 6: Response Time (tRESPONSE)
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
12
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
HIGH ISOLATION PCB LAYOUT
7.25
2.25
3.56
1.27
1.27
0.65
15.75
9.54
17.27
21.51
Package Outline
Slot in PCB to maintain >8 mm creepage
once part is on PCB
Current
In
Current
Out
Perimeter holes for stitching to the other,
matching current trace design, layers of
the PCB for enhanced thermal capability.
NOT TO SCALE
All dimensions in millimeters.
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
13
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Figure 7: Package MA, 16-pin SOICW
For Reference Only – Not for Tooling Use
(Reference MS-013AA)
NOTTO SCALE
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
C
1.27 BSC
A
B
C
21
16
Branding scale and appearance at supplier discretion
C
SEATING
PLANE
C0.10
16X
0.25 BSC
1.40 REF
2.65 MAX
10.30 ±0.20
7.50 ±0.10 10.30 ±0.33
0.51
0.31
0.30
0.10
0.33
0.20
1.27
0.40
8°
0°
A
Branded Face
SEATING PLANE
GAUGE PLANE
Terminal #1 mark area
C
2
1
16
0.65 1.27
9.50
2.25
PCB Layout Reference View
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
1
Standard Branding Reference View
NNNNNNN
LLLLLLLL
= Device part number
= Assembly Lot Number, first eight characters
N
L
PACKAGE OUTLINE DRAWING
High Isolation Linear Current Sensor IC
with 850 µΩ Current Conductor
ACS718
14
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
For the latest version of this document, visit our website:
www.allegromicro.com
Revision History
Number Date Description
–December 15, 2014 Initial Release
1June 15, 2015 Corrected pinout diagram
2April 13, 2016 Corrected Package Outline Drawing branding information (page 13).
3December 14, 2018 Updated certificate numbers and minor editorial updates
4May 21, 2019 Updated TUV certificate mark
Copyright 2019, Allegro MicroSystems.
Allegro MicroSystems 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
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