Datasheet

Data Sheet
Broadcom ACHS-7124-7125-DS101
February 15, 2019
Description
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 (>V
OUT(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.
Features
 Wide operating temperature: –40ºC to +110ºC
 Internal conductor resistance: 0.7 mΩ typ.
 Sensing current range ±40A and ±50A (see the table
footnote
a
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
Applications
 Low-power inverter current sensing
 Motor phase and rail current sensing
 Solar inverters
 Chargers and converters
 Switching power supplies
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.
Part Number Current Range Sensitivity
ACHS-7124 ±40A 50 mV/A
ACHS-7125
±50A
a
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.
40 mV/A
ACHS-7124/7125
Fully Integrated, Hall Effect-Based Linear
Current Sensor IC with 3 kV
RMS
Isolation and
Low-Resistance Current Conductor