1. Products
  2. Interface and Isolation
  3. Digital Isolation Technology
  4. Standard Digital Isolators
  5. ADuM121N


Features and Benefits

  • High common-mode transient immunity: 100 kV/µs typical
  • High robustness to radiated and conducted noise
  • Low propagation delay
    • 13 ns maximum for 5 V operation
    • 15 ns maximum for 1.8 V operation
  • 150 Mbps minimum data rate
  • Safety and regulatory approvals
    • UL recognition: 3000 V rms for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A
    • VDE certificate of conformity
      • DIN VDE V 0884-11:2017-01
      • VIORM = 565 V peak
    • CQC certification per GB4943.1-2011
  • Backward compatibility
    • ADuM120N0 pin-compatible with ADuM1285
    • ADuM120N1 pin-compatible with ADuM1280 and ADuM1200
    • ADuM121N0 pin-compatible with ADuM1286
    • ADuM121N1 pin-compatible with ADuM1281 and ADuM1201
  • Low dynamic power consumption
  • 1.8 V to 5 V level translation
  • High temperature operation: 125°C
  • Failsafe high or low options
  • 8-lead, RoHS-compliant, SOIC package
  • Qualified for automotive applications

Product Details

The ADuM120N/ADuM121N1 are dual-channel digital isolators based on Analog Devices, Inc., iCoupler® technology. Combining high speed, complementary metal-oxide semiconductor (CMOS) and monolithic air core transformer technology, these isolation components provide outstanding performance characteristics superior to alternatives such as optocoupler devices and other integrated couplers. The maximum propagation delay is 13 ns with a pulse width distortion of less than 3 ns at 5 V operation. Channel matching is tight at 3.0 ns maximum.

The ADuM120N/ADuM121N data channels are independent and are available in a variety of configurations with a withstand voltage rating of 3 kV rms (see the Ordering Guide). The devices operate with the supply voltage on either side ranging from 1.8 V to 5 V, providing compatibility with lower voltage systems as well as enabling voltage translation functionality across the isolation barrier.

Unlike other optocoupler alternatives, dc correctness is ensured in the absence of input logic transitions. Two different fail-safe options are available in which the outputs transition to a predetermined state when the input power supply is not applied or the inputs are disabled.

The ADuM120N0 is pin-compatible with the ADuM1285, and the ADuM120N1 is pin-compatible with the ADuM1280 and the ADuM1200. The ADuM121N0 is pin-compatible with ADuM1286, and the ADuM121N1 is pin-compatible with the ADuM1281 and the ADuM1201.


  • General-purpose multichannel isolation
  • Industrial field bus isolation

1 Protected by U.S. Patents 5,952,849; 6,873,065; 6,903,578; and 7,075,329. Other patents are pending.

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Tools & Simulations

IBIS Model

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
ADUM121N0BRZ Material Declaration Reliability Data 8-Lead SOIC
ADUM121N0BRZ-RL7 Material Declaration Reliability Data 8-Lead SOIC
ADUM121N0WBRZ Material Declaration Reliability Data 8-Lead SOIC
ADUM121N0WBRZ-RL7 Material Declaration Reliability Data 8-Lead SOIC
ADUM121N1BRZ Material Declaration Reliability Data 8-Lead SOIC
ADUM121N1BRZ-RL7 Material Declaration Reliability Data 8-Lead SOIC
ADUM121N1WBRZ Material Declaration Reliability Data 8-Lead SOIC
ADUM121N1WBRZ-RL7 Material Declaration Reliability Data 8-Lead SOIC
Wafer Fabrication Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.