Isolated Linear Sensing IC

The HCPL-7520 Isolated Linear Sensing IC is designed for current sensing in electronic motor or servo drive applications.

In a typical implementation, motor current flows through an external resistor and the resulting analog voltage drop is sensed by the HCPL-7520. An output voltage is created on the other side of the HCPL-7520 optical isolation barrier. The single-ended output voltage is proportional to the motor current. Since common-mode votlage swings of several hundred volts in tens of nanoseconds are common in modern switching inverter motor drives, the HCPL-7520 was designed to ignore very high common-mode transient slew rates (of at least 10 kV/µs).

The high CMR capability of the HCPL-7520 isolation amplifier 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.

The product can also be used for general analog signal isolation applications. The HCPL-7520 comes with a gain tolerance of ±5% which is suitable for general applications (A tighter tolerance ±3% HCPL-7510 is available).  The HCPL-7520 utilizes Sigma-Delta analog-to-digital converter technology to delivery offset and gain accuracy and stability over time and temperature. 

This performance is delivered in a compact, auto-insert, industry standard 8-pin DIP package that meets worldwide regulatory safety standards. (A gull-wing surface mount option #300 is also available).

Evaluation board is available. Contact your Avago sales representative or authorized distributor for information.


Pb-free options


Lifecycle status:

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Features [+-]

  • 15 kV/µs common-mode rejection at Vcm = 1000 V
  • Compact, auto-insertable 8-pin DIP package
  • 60 ppm/°C gain drift vs. temperature
  • -0.6 mV input offset voltage
  • 8 µV/°C input offset voltage vs temperature
  • 100 kHz bandwidth
  • 0.06% nonlinearity, single-ended amplifier output for low power application
  • Worldwide safety approval:
    UL 1577 (3750 Vrms/1 min.), CSA and IEC/EN/DIN EN 60747-5-2 (Option 060 only)
  • Advanced sigma-delta A/D converter technology
  • Options available are:
    300 = Gull Wing Surface Mount Option
    500 = Tape and Reel Packaging Option
    060 = IEC/EN/DIN EN 60747-5-2
    XXXE = Lead Free Option

Applications [+-]

  • Low-power inverter current sensing
  • Motor phase and rail current sensing
  • Dc bus sensing
  • Switched mode power supply signal isolation
  • General purpose low-power current sensing and monitoring
  • General purpose analog signal isolation

Benefits [+-]

  • Simplifies system design and overall cost
  • Allows for smaller design margin, system stability over wide temperature range
  • Improve system performance and better data integrity
  • Lower insertion cost, easier and faster handling
  • Provide most accurate and timely current information

Documents [+-]

Data Sheets & Technical Specifications

Application Notes

Brochures/Promotional Materials

Design & Reference Guides


Obsolescence Notices

Product Change Notices

Quality & Reliability

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