Precision Miniature Isolation Amplifiers

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The ACPL-C79B/C79A/C790 isolation amplifiers were designed for current sensing and voltage sensing in electronic power converters in applications including motor drives and renewable energy systems. In a typical motor drive implementation, current flows through an external resistor and the resulting analog voltage drop is sensed by the isolation amplifier. A differential output voltage that is proportional to the current is created on the other side of the optical isolation barrier.

For general applications, the ACPL-C79A (±1% gain tolerance) and the ACPL-C790 (±3% gain tolerance) are recommended. For high precision applications, the ACPL-C79B (±0.5% gain tolerance) can be used. The current sensor operates from a single 5 V supply and provides excellent linearity and dynamic performance of 60 dB SNR. With 200 kHz bandwidth, 1.6 µs fast response time, the current sensor captures transients in short circuit and overload conditions. The high common-mode transient immunity (15 kV/µs) of the ACPL-C79B/C79A/C790 provides 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.

Combined with superior optical coupling technology, the ACPL-C79B/C79A/C790 implements sigma-delta analog-to-digital converter, chopper stabilized amplifiers, and a fully differential circuit topology to provide unequaled isolation-mode noise rejection, low offset, high gain accuracy and stability. This performance is delivered in a compact, auto-insertable Stretched SO-8 package that meets worldwide regulatory safety standards. (Also available in DIP8/Gull Wing package ACPL-790B/790A/7900. )


  • 0.5% High Gain Accuracy (ACPL-C79B only)
  • –50 ppm/°C Low Gain Drift
  • 0.6 mV Input Offset Voltage
  • 0.05% Excellent Linearity
  • 60 dB SNR
  • 200 kHz Wide Bandwidth
  • 3 V to 5.5 V Wide Supply Range for Output Side
  • –40°C to +105°C Operating Temperature Range
  • Advanced Sigma-Delta A/D Converter Technology
  • Fully Differential Isolation Amplifier
  • 15 kV/µs Common-Mode Transient Immunity
  • Compact, Auto-Insertable Stretched SO-8 Package
  • Safety and Regulatory Approvals (pending):
    • IEC/EN/DIN EN 60747-5-5: 1140 Vpeak working insulation voltage
    • UL 1577: 5000 Vrms/1min double protection rating
    • CSA: Component Acceptance Notice #5
  • Options available are :
    • 000E: Lead Free Option
    • 500E: Tape and Reel Packaging Option


  • Current Sensing & Voltage Sensing in AC and Servo Motor Drive
  • Solar Inverters, Wind Turbine Inverter
  • Industrial Process Control
  • Data acquisition system
  • Switching Power Supply Signal Isolation
  • General Purpose Analog Signal Isolation
  • Traditional Hall Effect Current Sensor Replacement

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Product Type Miniature Isolation Amplifier
Package Stretched SO8
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) 5000.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 1414.0
IEC Highest Allowable Overvoltage Viotm (VPEAK) 8000
Application Note3 i
Brochures1 i
Options Data Sheet6 i
Product Change Notice (PCN)3 i
Reliability Data Sheet3 i
Selection Guide1 i
White Papers3 i
FAQs1 i
Promotional Material1 i