Optical Isolation Amplifier in 15mm Stretched SO8 Package

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The Broadcom ACNT-H79B/H79A/H790 are high-linearity optically isolated amplifier devices in 15mm wide creepage and 14.2mm clearance, designed for current and voltage sensing applications in systems such as motor drives and renewable energy inverters. In a typical motor drive implementation, the ACNT-H79B/H79A/H790 can be used to sense a voltage drop across a sense resistor. A differential output voltage that is proportional to the current across the resistor is created on the other side of the optical isolation barrier.

For general applications, the ACNT-H79A (±1% gain tolerance) and the ACNT-H790 (±3% gain tolerance) are recommended. For high precision applications, the ACNT-H79B (±0.5% gain tolerance) can be used. The ACNT-H79B/H79A/H790 offers wide creepage and clearance with 
 a high common-mode transient immunity of 15kV/μs. These features allows the ACNT-H79B/H79A/H790 to provide the precision and stability needed to accurately monitor motor current in high noise motor control environments, providing for smoother control (less “torque ripple”) in various types of motor control applications.

The ACNT-H79B/H79A/H790 operates from a single 5 V supply and provides excellent linearity and dynamic performance of 60dB SNR. With 200 kHz bandwidth, 1.6 μs fast response time, the ACNT-H79B/H79A/H790 captures 
transients in short circuit and overload conditions.


  • ±0.5% High Gain Accuracy (ACNT-H79B)
  • -50 ppm/°C Low Gain Drift
  • 0.6 mV Input Offset Voltage
  • 0.05% Excellent Linearity
  • 60dB SNR
  • 200kHz Wide Bandwidth (typ)
  • Operating Temperature Range: -40 °C to +105 °C
  • Advanced Sigma-Delta A/D Converter Technology
  • 0.5mm Distance Through Insulation (DTI)
  • 15 kV/µs Common-Mode Transient Immunity
  • 15mm Stretched SO-8 Package
  • Safety and Regulatory Approvals:
- IEC/EN/DIN EN 60747-5-5: 2,262 VPEAK Working Insulation Voltage
- UL 1577: 7,500 VRMS per Minute Double Protection Rating
- CSA: Component Acceptance Notice #5


  • Current Sensing & Voltage Sensing in AC and Servo Motor Drive
  • Mid-Voltage Drives
  • Solar Inverters, Wind Turbine Inverter
  • Industrial Process Control
  • General Purpose Analog Signal Isolation
  • Hall Effect Current Transducer Replacement

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Product Type Miniature Isolation Amplifier
Gain Error at 25 Deg C (%) Max ±3
VDD2 (V) 3 - 5.5
CMR (min.) (V/µs) 15000.0
Vcm (V) 1000.0
UL Insulation Rating Viso (VRMS) 7500.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 2262.0
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Precision Miniature Isolation Amplifiers


Precision Miniature Isolation Amplifiers