Broadcom ACHS-712x Current Sensor ICs

Broadcom ACHS-712x Current Sensor ICs are a fully integrated Hall Effect-based isolated linear current sensor device family. These devices are designed for AC or DC current sensing in industrial, commercial, and communications systems. Each of the devices 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. The 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 copper conduction path, which is the path used for current sampling. The internal resistance of this conductive path is 0.7mΩ typical, providing low-power loss. The terminals of the conductive path are electrically isolated from the signal leads (pins 5 through 8).

Features

-40°C to +110°C wide operating temperature range
0.7mΩ typical primary conductor resistance
±10A, ±20A, ±30A, ±40A, ±50A sensing current range*
40mV/A, 50mV/A, 66mV/A, 100mV/A, 185mV/A (ACHS-7125/7124/7123/7122/7121) Output sensitivity
Output voltage proportional to AC or DC currents
Ratiometric output from the supply voltage
5V single supply operation
Device bandwidth is set via FILTER pin of 80kHz typ. bandwidth with a 1nF filter capacitor

Low-noise analog signal path
Factory-trimmed for accuracy
Extremely stable output offset voltage
Near zero magnetic hysteresis
Typical total output error of ±1.5%
>25kV/μs common-mode transient immunity
Small footprint, low-profile SO-8 package
Worldwide Safety Approval: UL, CSA: isolation voltage 3kV_RMS, 1 minute

*To be derated above 85°C ambient at –25.2mW/°C on 4oz copper PCB.

Note: ACHS-712x are specified typically. Customer can opt for ACHS-719x (7191/2/3/4/5) if performance across the operating ambient of -40°C to 110°C, and if IEC/EN 62368-1 system regulatory approval are needed.