Isolated Linear Sensing IC

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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 Broadcom sales representative or authorized distributor for information.



  • 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


  • 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

Lifecycle Status


Substance Compliance

  • RoHS
    Pb & Pb-free options available
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Pb & Pb-free options available
Product Type Miniature Isolation Amplifier
Package 300mil DIP-8
Operating Temperature Deg C -40 to +85
Gain Error at 25 Deg C (%) Max ±5
VDD2 (V) 4.5 - 5.5
CMR (min.) (V/µs) 15000.0
Vcm (V) 1000.0
UL Insulation Rating Viso (VRMS) 3750.0
IEC Maximum Working Insulation Voltage Viorm (VPEAK) 891.0
IEC Highest Allowable Overvoltage Viotm (VPEAK) 6000
Application Brief1 i
Application Note10 i
Brochures3 i
Design Guide1 i
FAQs2 i
Obsolescence Notice1 i
Options Data Sheet6 i
Photocard1 i
Product Change Notice (PCN)12 i
Regulatory Certificate3 i
Reliability Data Sheet1 i
Selection Guide2 i
White Papers4 i
Promotional Material1 i