Analog Devices Inc. ADuM3151 SPIsolator™ Digital Isolators

Analog Devices Inc. ADuM3151 SPIsolator™ Digital Isolators are 7-channel, dedicated 3.75kVrms digital isolators optimized for isolated serial peripheral interfaces (SPIs) with 2/1 aux channel directionality. These isolators employ iCoupler® chip-scale transformer technology that provides low propagation delay in the CLK, MO/SI, MI/SO, and SS SPI bus signals and support SPI clock rates of up to 17MHz. These channels operate with a 14ns propagation delay and 1ns jitter to optimize timing for SPI. The ADuM3151 isolators also provide two additional independent low data rate isolation channels, one channel in each direction. Data in the slow channels are sampled and serialized for a 250kbps data rate with 2.5μs of jitter.


  • Support up to 17MHz SPI clock speed 4 high speed, low propagation delay, and SPI signal isolation channels
  • Three 250kbps data channels 20-lead SSOP package with 5.1 mm creepage
  • High-temperature operation at 125°C
  • High common-mode transient immunity: >25kV/μs
  • Safety and regulatory approvals:
    • UL recognition per UL 1577 (pending)
      • 3750Vrms for 1 minute
    • CSA Component Acceptance Notice 5A (pending)
    • VDE certificate of conformity (pending)
      • DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
      • VIORM = 560V peak


  • Industrial programmable logic controllers (PLCs)
  • Sensor isolation

Functional Block Diagram

Block Diagram - Analog Devices Inc. ADuM3151 SPIsolator™ Digital Isolators

Additional Resources

Design a complete, fully isolated, and highly flexible, 4-channel analog input system for PLCs

Suitable for programmable logic controllers (PLCs) and distributed control system (DCS) applications in the harshest industrial environments this circuit from the lab delivers multiple voltage inputs with open wire detection and HART-compatible, 4mA to 20mA current inputs and all channels protected from transient overvoltage or overcurrent events.

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Published: 2015-01-29 | Updated: 2022-03-11