Data Sheet
ACHS-7124/7125
Fully Integrated, Hall Effect-Based Linear
Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
Description
Features
®
The Broadcom ACHS-7124/7125 product series is a fully
integrated Hall Effect-based isolated linear current sensor
device family designed for AC or DC current sensing in
industrial, commercial, and communications systems. Each
of the ACHS-7124/7125 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 that 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 CMOS Hall IC, which is programmed for
accuracy after packaging. The output of the device has a
positive slope (>VOUT(Q)) when an increasing current flows
through the primary 4 oz 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 0.7 mΩ
typical, providing low power loss. The terminals of the
conductive path are electrically isolated from the signal
leads (pins 5 through 8). This performance is delivered in a
compact, surface mountable, SO-8 package that meets
worldwide regulatory safety standards.
Applications
Part Number
Current Range
Sensitivity
ACHS-7124
±40A
50 mV/A
ACHS-7125
±50Aa
40 mV/A
Wide operating temperature: –40ºC to +110ºC
Internal conductor resistance: 0.7 mΩ typ.
Sensing current range ±40A and ±50A (see the table
footnotea under the part number table to the left)
Output sensitivity: 40mV/A to 50 mV/A
Output voltage proportional to AC or DC currents
Ratiometric output from supply voltage
Single supply operation: 5.0V
Low-noise analog signal path
Device bandwidth is set using the new FILTER pin:
80-kHz typ. Bandwidth with 1-nF filter capacitor
Factory-trimmed for accuracy
Extremely stable output offset voltage
Near zero magnetic hysteresis
Typical total output error of ±1.5%
>25 kV/µs common-mode Transient Immunity
Small footprint, low-profile SO-8 package
Worldwide safety approvals: UL; CSA; Isolation
Voltage: 3 kVrms, 1 minute
Low-power inverter current sensing
Motor phase and rail current sensing
Solar inverters
Chargers and converters
Switching power supplies
a. Due to the SO-8 package power dissipation limitations, the
input RMS or DC current of 50A product needs to be derated
above 85°C ambient at –25.2 mW/°C on 4 oz copper PCB.
CAUTION! Take normal static precautions in handling and assembly of this component to prevent damage, degradation, or
both, which may be induced by ESD. The components featured in this data sheet are not to be used in military
or aerospace applications or environments. The component is not AEC-Q100 qualified and not recommended
for automotive applications.
Broadcom
ACHS-7124-7125-DS103
October 29, 2020
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Functional Diagram
NOTE:
The connection of 1-µF bypass capacitor between pins 8 and 5 is recommended.
Pin Description
Pin
Pin Name
1
IP+
2
IP+
3
IP-
4
IP-
Description
Terminals for current being
sampled; fused internally
Terminals for current being
sampled; fused internally
Pin
Pin Name
8
VDD
7
VOUT
6
FILTER
5
GND
Description
Supply voltage relative to GND
Output voltage
Filter pin to set bandwidth
Output side ground
Typical Application Circuit
A typical application circuit for the ACHS-7124/7125 product series consists of a bypass capacitor and a filter capacitor as
additional external components. On the input side, pins 1 and 2 are shorted together, and pins 3 and 4 shorted together. The
output voltage is directly measured from the VOUT pin.
C BYPASS
Broadcom
ACHS-7124-7125-DS103
2
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Ordering Information
Option
Part Number
ACHS-7124
ACHS-7125
Current
Range
(RoHS)
Compliant
Package
Surface Mount
±40A
-000E
SO-8
X
±50A
-500E
X
-000E
X
-500E
X
Tape and Reel
X
X
UL 3kVRMS
1 min. Rating
Quantity
X
100 per tube
X
1500 per reel
X
100 per tube
X
1500 per reel
To order, choose a part number from the part number column and combine with the desired option from the option column
to form an order entry.
Example 1:
ACHS-7124-500E to order product of ±40A, Surface Mount package in Tape and Reel packaging and RoHS compliance.
Contact your Broadcom sales representative or authorized distributor for information.
Option data sheets are available. Contact your Broadcom sales representative or authorized distributor for information.
Broadcom
ACHS-7124-7125-DS103
3
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Package Outline Drawing
ACHS-7124/7125 SO-8 Package
PART NUMBER
RoHS COMPLIANCE
DATECODE
LOT ID
Dimensions in millimeters (in.).
NOTE:
Lead co-planarity = 0.100 mm (0.004 in.) maximum
Floating lead protrusion = 0.254 mm (0.010 in.) maximum
Mold flash on each side = 0.127 mm (0.005 in.) maximum
Recommended Pb-Free IR Profile
Recommended reflow condition as per JEDEC Standard, J-STD-020 (latest revision). Non-halide flux should be used.
Broadcom
ACHS-7124-7125-DS103
4
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Regulatory Information
The ACHS-7124/7125 is approved by the following organizations:
UL/cUL
UL 1577, component recognition program up to VISO = 3000 VRMS. Approved under CSA Component Acceptance Notice#5.
Insulation and Safety Related Specifications
Parameter
Symbol
Value
Units
Minimum External Air Gap
(External Clearance)
L(101)
4.0
mm
Measured from the input terminals to the output terminals, the
shortest distance through air
Minimum External Tracking
(External Creepage)
L(102)
4.0
mm
Measured from the input terminals to the output terminals, the
shortest distance path along body
Minimum Internal Plastic Gap
(Internal Clearance)
—
0.05
mm
Through the insulation distance, conductor to conductor, usually
the direct distance between the primary input conductor and he
detector IC
Tracking Resistance
(Comparative Tracking Index)
CTI
>175
V
DIN IEC 112/VDE 0303 Part 1
—
IIIa
—
Material Group (DIN VDE 0110, 1/89, Table 1)
Isolation Group
Conditions
Absolute Maximum Ratings
Parameter
Symbol
Min.
Max.
Units
Storage Temperature
TS
–55
+125
°C
Ambient Operating Temperature
TA
–40
+110
°C
Junction Temperature
TJ
—
+150
°C
Primary Conductor Lead Temperature
TL
—
+150
°C
Supply Voltages
VDD
–0.5
8.0
V
Output Voltage
VOUT
–0.5
VDD + 0.5
V
IOUT(source)
—
10
mA
IOUT(sink)
—
10
mA
IP
—
100
A
Input Power Dissipationa
PIN
—
1750
mW
Output Power Dissipation
POUT
—
90
mW
Output Current Source
Output Current Sink
Overcurrent Transient Tolerance
Test Conditions
Pins 1, 2, 3, or 4
TA = 25°C
TA = 25°C
1 pulse, 100 ms; TA = 25°C
a. Absolute Maximum Input Power Dissipation is only valid if 4-oz copper PCB is used. This power is valid up to 85°C ambient temperature. For
>85°C ambient, a derating factor of –25.2 mW/°C is needed.
Broadcom
ACHS-7124-7125-DS103
5
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Recommended Operating Conditions
Parameter
Symbol
Min.
Max.
Units
TA
–40
110
°C
VDD
4.5
5.5
V
Output Capacitance Load
CLOAD
—
10
nF
Output Resistive Load
RLOAD
4.7
—
kΩ
Ip
–40
40
A
–50
50
A
Ambient Operating Temperature
Supply Voltage
Input Peak Current Range
ACHS-7124
a
ACHS-7125
a. Due to the SO-8 package power dissipation limitations, the input peak current is valid up to 85°C ambient temperature only on 4-oz copper
PCB. For >85°C ambient, derating is needed. For details, refer to Footnote a at Absolute Maximum Ratings. For Input Power Derating Curve,
refer to the curve as shown in the following section.
Primary Power Derating Curve for ACHS-7125
2
Pin(W)
1.75W
1.8
Maximum Primary Power
1.6
1.4
1.2
1.12W
1
0.8
0.6
0.4
0.2
TA (°C)
0
-40
-20
0
20
40
60
80
85
100
110
Operating Ambient Temperature
NOTE:
Broadcom
Mounted on Broadcom’s Evaluation Board as shown in Figure 16 and Figure 17.
ACHS-7124-7125-DS103
6
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Common Electrical Specifications
Unless otherwise stated, all minimum/maximum specifications are over recommended operating conditions, CF=1 nF. All
typical values are based on TA = 25°C, VDD = 5.0V, CF=1 nF.
Parameter
Symbol
Min.
Typ.
Max.
Units
IDD
—
13
15
mA
RPRIMARY
—
0.7
—
mΩ
Zero Current Output Voltage
VOUT(Q)
—
VDD / 2
—
V
Input Filter Resistance
RF(INT)
—
1.6
—
kΩ
Bandwidth
BW
—
80
—
kHz
Rise Time
tr
—
4
—
µs
10
tPO
—
21
—
µs
9
CMTI
25
—
—
kV/µs
Supply Current
Primary Conductance Resistance
Power-on Time
Common Mode Transient
Immunity
Test Condition
VDD = 5V, output open
Bidirectional, IP = 0A
Figure
Note
7, 8
2
–3 dB
VCM = 1000V
a
a. Common Mode Transient Immunity is tested by applying a fast rising/falling voltage pulse across Pin 4 and GND (pin 5). The output glitch
observed is less than 0.2 V from the average output voltage for less than 1 µs.
Broadcom
ACHS-7124-7125-DS103
7
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Electrical Specifications
ACHS-7124
Unless otherwise stated, all minimum/maximum specifications are over recommended operating conditions, CF=1 nF. All
typical values are based on TA = +25°C, VDD = 5.0V, CF = 1 nF.
Parameter
Symbol
Min.
Typ.
Max.
Units
Figure
Note
IP
–40
—
+40
A
4
a
Sensitivity
Sens
—
50
—
mV/A
–40A ≤ IP ≤ 40A
1
b
Sensitivity Error
ESENS
–3
—
+3
%
TA = 25°C, VDD = 5V
1
b
Sensitivity Slope
Sens
—
0.01
—
mV/A/°C TA = –40°C to 25°C
1
b
Sensitivity Slope
Sens
—
0.01
—
mV/A/°C TA = 25°C to 110°C
1
b
Zero Current Output Error
VOE
–20
—
+20
mV
TA = 25°C
2
b
Zero Current Output Error
Slope
VOE
—
–0.01
—
mV/°C
TA = –40°C to 25°C
2
b
Zero Current Output Error
Slope
VOE
—
0.02
—
mV/°C
TA = 25°C to 110°C
2
b
Output Noise
VN(RMS)
—
2
—
mV
BW = 2 kHz
5
c
Nonlinearity
NL
—
0.1
—
%
3
d
ETOT
—
±1.5
—
%
6
e
Sensitivity Error Lifetime
Drift
ESENS_DRIFT
—
±2
—
%
b
Total Output Error Lifetime
Drift
ETOT_DRIFT
—
±2
—
%
b
Optimized Accuracy
Range
Total Output Error
Test Conditions
TA = 25°C
a. The device may be operated at higher primary current levels, IP, provided that the Maximum Junction Temperature, TJ(MAX) is not exceeded.
b. Refer to Definition of Electrical Characteristics of this data sheet.
c. Output Noise is the noise level of ACHS-7124/7125 expressed in root mean square (RMS) voltage.
d. Nonlinearity is defined as half of the peak-to-peak output deviation from the best-fit line, expressed as a percentage of the full-scale output
voltage. Refer to Definition of Electrical Characteristics of this data sheet for the complete definition and formula.
e. Total Output Error in percentage is the difference between the measured output voltage at maximum input current (IPMAX) and the ideal output
voltage at IPMAX divided by the ideal output voltage at IPMAX. The Total Output Error's typical value is based on total output error measured
at the point of product release.
Broadcom
ACHS-7124-7125-DS103
8
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
ACHS-71251
Unless otherwise stated, all minimum/maximum specifications are over recommended operating conditions, CF=1 nF. All
typical values are based on TA = +25°C, VDD = 5.0V, CF = 1 nF.
Parameter
Symbol
Min.
Typ.
Max.
Units
Figure
Note
IP
–50
—
+50
A
4
a
Sensitivity
Sens
—
40
—
mV/A
–50A ≤ IP ≤ +50A
1
b
Sensitivity Error
ESENS
–3
—
+3
%
TA = 25°C, VDD = 5V
1
b
Sensitivity Slope
Sens
—
0.01
—
mV/A/°C TA = –40°C to 25°C
1
b
Sensitivity Slope
Sens
—
0
—
mV/A/°C TA = 25°C to 110°C
1
b
Zero Current Output Error
VOE
–20
—
+20
mV
TA = 25°C
2
b
Zero Current Output Error
Slope
VOE
—
–0.01
—
mV/°C
TA = –40°C to 25°C
2
b
Zero Current Output Error
Slope
VOE
—
0.01
—
mV/°C
TA = 25°C to 110°C
2
b
Output Noise
VN(RMS)
—
1.7
—
mV
BW = 2 kHz
5
c
Nonlinearity
NL
—
0.08
—
%
3
d
ETOT
—
±1.5
—
%
6
e
Sensitivity Error Lifetime
Drift
ESENS_DRIFT
—
±2
—
%
-
b
Total Output Error Lifetime
Drift
ETOT_DRIFT
—
±2
—
%
-
b
Optimized Accuracy
Range
Total Output Error
Test Conditions
TA = 25°C
a. The device may be operated at higher primary current levels, IP, provided that the Maximum Junction Temperature, TJ(MAX) is not exceeded.
b. Refer to Definition of Electrical Characteristics in this data sheet.
c. Output Noise is the noise level of ACHS-7124/7125 expressed in root mean square (RMS) voltage.
d. Nonlinearity is defined as half of the peak-to-peak output deviation from the best-fit line, expressed as a percentage of the full-scale output
voltage. Refer to Definition of Electrical Characteristics of this data sheet for the complete definition and formula.
e. Total output error in percentage is the difference between the measured output voltage at maximum input current (IPMAX) and the ideal output
voltage at IPMAX divided by the ideal output voltage at IPMAX. The Total Output Error's typical value is based on total output error measured
at the point of product release.
1.
Broadcom
Due to the SO-8 package power dissipation limitations, the input RMS or DC current of 50A product must be derated above
85°C ambient at –25.2 mW/°C on 4 oz copper PCB.
ACHS-7124-7125-DS103
9
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Package Characteristics
Parameter
Symbol
Min.
Typ.
Max.
Units
Test Condition
Note
Input-Output Momentary Withstand
Voltage
VISO
3000
—
—
VRMS
RH < 50%, t = 1 min.,
TA = 25°C
a b c
Resistance (Input-Output)
RI-O
—
1014
—
Ω
VI-O = 500 VDC
c
Capacitance (Input-Output)
CI-O
—
1.2
—
pF
f = 1 MHz
c
Junction-to-Ambient Thermal
Resistance (due to primary
conductor)
Rθ12
—
35
—
°C/W
Based on the Broadcom
evaluation board
d
Junction-to-Ambient Thermal
Resistance (due to IC)
Rθ22
—
22
—
°C/W
Based on the Broadcom
evaluation board
d
, ,
a. In accordance with UL 1577, each device is proof tested by applying an insulation test voltage ≤ 3600 VRMS for 1 second.
b. The Input-Output Momentary Withstand Voltage is a dielectric voltage rating that should not be interpreted as an input-output continuous
voltage rating.
c. This is a two-terminal measurement: pins 1 through 4 are shorted together and pins 5 through 8 are shorted together.
d. The Broadcom evaluation board has 600 mm2 (total area including top and bottom copper minus the mounting holes) of 4-oz copper
connected to pins 1 and 2 and pins 3 and 4. Refer to Thermal Consideration in this data sheet for additional information on thermal
characterization.
Broadcom
ACHS-7124-7125-DS103
10
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Typical Performance Plots
All typical plots are based on TA = 25°C, VDD = 5V, CF = 1 nF, unless otherwise stated.
Figure 1: Sensitivity vs. Temperature
Figure 2: Zero Current Output Voltage vs. Temperature
2.515
ACHS-7124
ACHS-7125
55
50
45
40
35
30
-40
-20
0
20
40
60
80
100
120
Zero Current Output Voltage VOUT(Q) - V
SensiƟvity (Sens) - mV/A
60
ACHS-7124
2.510
2.505
2.500
2.495
2.490
2.485
-40
Temperature (TA) - oC
0
20
40
60
80
100 120
Figure 4: Output Voltage vs. Input Current
5.0
0.20
0.18
ACHS-7124
ACHS-7125
0.16
4.5
Output Voltage (VOUT) - V
Nonlinearity (NL) - %
-20
Temperature (TA) - oC
Figure 3: Nonlinearity vs. Temperature
0.14
0.12
0.10
0.08
0.06
0.04
0.02
4.0
3.5
3.0
2.5
2.0
1.5
1.0
ACHS-7124
ACHS-7125
0.5
0.00
-40
-20
0
20
40
60
80
Temperature (TA) - oC
Broadcom
ACHS-7125
100
120
0.0
-50 -40 -30 -20 -10
0
10
20
30
40
50
Input Current (Ip), A
ACHS-7124-7125-DS103
11
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Figure 5: Output Noise vs. External Filter Capacitance
Figure 6: Total Output Error at IP(MAX) vs. Temperature
8
10.000
ACHS-7124
Total Output Error - %
Output Noise (VNRMS) - mV
6
1.000
ACHS-7124
ACHS-7125
ACHS-7125
4
2
0
-2
-4
-6
-8
0.100
0.01
0.1
1
10
-40
100
-20
0
External Filter Capacitance (CF) - nF
Figure 7: Mean Supply Current vs. Temperature
40
60
80
100
120
Figure 8: Supply Current vs. Supply Voltage
13.8
14.5
13.6
14.0
13.5
IDD, mA
13.4
IDD, mA
20
Temperature (TA) - oC
13.2
13.0
13.0
12.5
110 degC
25 degC
-40 degC
12.0
12.8
11.5
12.6
11.0
-40 -20
0
20
40
60
80
3
100 120
3.5
4
4.5
5
5.5
6
VDD, V
Temperature, C
Figure 9: Power-on Time vs. External Filter
Figure 10: Rise Time vs. External Filter
30
100
Ip=Ip(max)
25
20
60
Tr, us
Power On Time, us
80
15
40
10
20
0
0
0
2
4
6
Cf, nF
Broadcom
Ip=Ip(max)
5
8
10
0
2
4
6
8
10
Cf, nF
ACHS-7124-7125-DS103
12
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
ACHS-7124/7125 Data Sheet
Definition of Electrical Characteristics
The ACHS-7124/7125 product series is a Hall-Effect current
sensor that outputs an analog voltage proportional to the
magnetic field intensity caused by the current flowing
through the input primary conductor. Without magnetic field
the output voltage is half of the supply voltage. The sensor
can detect both DC and AC current.
Figure 11: Nonlinearity Calculation
Ratiometric Output
The output voltage of the ACHS-7124/7125 series is
ratiometric or proportional to the supply voltage. The
sensitivity (Sens) of the device and the quiescent output
voltage changes when there is a change in the supply
voltage (VDD). For example, for ACHS-7125 when the VDD
is increased by +10% from 5V to 5.5V, the quiescent output
voltage will change from 2.5V to 2.75V and the sensitivity
also changes from 40 mV/A to 44 mV/A.
Sensitivity
The output sensitivity (Sens) is the ratio of the output
voltage (VOUT) over the input current (IP) flowing through the
primary conductor. It is expressed in mV/A. When an
applied current flows through the input primary conductor, it
generates a magnetic field that the Hall IC converts into a
voltage. The proportional voltage is provided by the Hall IC,
which is programmed in the factory for accuracy after
packaging. The output voltage has a positive slope when an
increasing current flows through the pins 1 and 2 to pins 3
and 4. Sensitivity Error (ESENS) is the difference between
the measured Sensitivity and the Ideal Sensitivity
expressed as a percentage (%).
Zero Current Output Voltage
This is the output voltage of ACHS-7124/7125 when the
primary current is zero. Zero current output voltage is half of
the supply voltage (VDD / 2).
Zero Current Output Error
This the voltage difference between the measured output
voltage and the ideal output voltage (VDD / 2) when there is
no input current to the device.
Total Output Error
Total output error in percentage is the difference between
the measured output voltage at maximum input current
(IPMAX) and the ideal output voltage at IPMAX divided by the
ideal output voltage at IPMAX.
Nonlinearity
Measured VOUT @ IPMAX – Ideal VOUT @ IPMAX
Error (%) =
Nonlinearity is defined as half of the peak-to-peak output
deviation from the best-fit line (BFL), expressed as a
percentage of the full-scale output voltage. The full-scale
output voltage is the product of the sensitivity (Sens) and full
scale input current (IP).
[(Max from BFL – Min from BFL) / 2]
NL (%) =
× 100%
Sens × full scale IP
Broadcom
× 100%
Ideal VOUT @ IPMAX
Power-on Time
This is the time required for the internal circuitry of the
device to be ready during the ramping of the supply voltage.
Power on time is defined as the finite time required for the
output voltage to settle after the supply voltage reached its
recommended operating voltage.
ACHS-7124-7125-DS103
13
ACHS-7124/7125 Data Sheet
FILTER Pin
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
Figure 12: Land Pattern for 4-mm Creepage
The ACHS-7124/7125 has a FILTER pin for improving the
signal-to-noise ratio of the device. This eliminates the need
for external RC filter to the VOUT pin of the device that can
cause attenuation of the output signal. A ceramic capacitor,
CF, can be connected between the FILTER pin to GND.
Application Information
PCB Layout
The design of the printed circuit board (PCB) should follow
good layout practices, such as keeping bypass capacitors
close to the supply pin and use of ground and power planes.
A bypass capacitor must be connected between pins 5 and
8 of the device. The layout of the PCB can also affect the
common mode transient immunity of the device due to stray
capacitive coupling between the input and output circuits. To
obtain maximum common mode transient immunity
performance, the layout of the PCB should minimize any
stray coupling by maintaining the maximum possible
distance between the input and output sides of the circuit
and ensuring that any ground or power plane on the PCB
does not pass directly below or extend much wider than the
body of the device.
Effect of PCB Layout on Sensitivity
The trace layout on the input pins of ACHS-7124/7125
affects the sensitivity. It is recommended that the PCB trace
connection to the input pins covers the pins fully as shown
in Figure 13.
Figure 13: Recommended Trace Layout on the Input Pins
Land Pattern for 4-mm Board Creepage
For applications that require PCB creepage of 4-mm
between input and output sides, the land pattern in
Figure 12 can be used.
Broadcom
ACHS-7124-7125-DS103
14
ACHS-7124/7125 Data Sheet
When the connection to the input pin only covers the vertical
portion of the input pin, there is a sensitivity variation of
about –0.6% versus recommended PCB trace layout as
shown in Figure 14.
Figure 14: Vertical Portion Connection
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Isolation and
Low-Resistance Current Conductor
Thermal Consideration
The evaluation board used in the thermal characterization is
shown in Figure 16. The inputs IP+ and IP- are each
connected to input plane of 4 oz. copper with at least
600 mm2 total area (including top and bottom planes, minus
the screws mounting holes). The output side GND is
connected to a ground plane of 4 oz. copper with 460 mm2
total area (including top and bottom planes). The 4 oz.
copper enables the board to conduct higher current and
achieve good thermal distribution in a limited space.
Figure 16: Broadcom Evaluation Board – Top Layer
When the connection to the input pin only covers the
horizontal portion of the input pin, there is a sensitivity
variation of about +1.2% versus recommended PCB trace
layout as shown in Figure 15.
Figure 15: Horizontal Portion Connection
Figure 17: Broadcom Evaluation Board – Bottom Layer
Broadcom
ACHS-7124-7125-DS103
15
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