ISO7521C Low-Power 5 KVrms Dual Digital Isolators |

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Low-Power 5 KVrms Dual Digital Isolators


Recommended alternative parts

  • ISO7721  - The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent.   Pin-to-pin upgrade with higher isolation, stronger CMTI, wider supply range, and better immunity and robustness


The ISO7520C and ISO7521C provide galvanic isolation of up to 4243 VRMS for 1 minute per UL and 6000 VPK per VDE. These devices are also certified to 5000 VRMS reinforced insulation per end equipment standards IEC 60950-1, IEC 61010-1, and IEC 60601-1. These digital isolators have two isolated channels with unidirectional (ISO7520C) and bidirectional (ISO7521C) channel configurations. Each isolation channel has a logic input and output buffer separated by a silicon oxide (SiO2) insulation barrier. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry. The devices have TTL input thresholds and can operate from 3.3- and 5-V supplies. All inputs are 5-V tolerant when supplied from 3.3-V supplies.

NOTE: The ISO7520C and ISO7521C are specified for signaling rates up to 1 Mbps. Due to their fast response time, these devices will also transmit faster data with much shorter pulse widths. Designers must add external filtering to remove spurious signals with input pulse duration < 20 ns, if desired.


  • Highest Signaling Rate: 1 Mbps
  • Propagation Delay Less Than 20 ns
  • Low-Power Consumption
  • Wide Ambient Temperature: –40°C to 105°C
  • 50 kV/µs Transient Immunity Typical
  • Operates From 3.3-V or 5-V Supply and Logic
  • 3.3-V and 5.0-V Level Translation
  • Safety and Regulatory Approvals
    • 6000 VPK Isolation per DIN V VDE V 0884-10
      and DIN EN 61010-1
    • 4243 VRMS Isolation for 1 Minute per UL 1577
    • CSA Component Acceptance Notice 5A, IEC
      60950-1, IEC 61010-1, and IEC 60601-1 End
      Equipment Standards
    • TUV 5000 VRMS Isolation per EN 60950-1 and
      EN 61010-1
    • CQC Certification per GB4943.1-2011
    • Opto-Coupler Replacement in:
      • Industrial Field-Buses
        • ProfiBuses
        • ModBuses
        • DeviceNet™ Data Buses
      • Servo Control Interfaces
      • Motor Control
      • Power Supplies
      • Battery Packs

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Part number Order Integrated isolated power Number of channels (#) Forward/reverse channels Isolation rating (Vrms) Surge voltage capability (Vpk) Data rate (Max) (Mbps) Current consumption per channel (DC) (Typ) (mA) Current consumption per channel (1 Mbps) (Typ) (mA) Propagation delay (Typ) (ns) Default output VCC (Min) (V) VCC (Max) (V) Rating Operating temperature range (C)
ISO7521C Order now No     2     1/1     4200     5200     1     1.5     1.5     9     High     3.3     5     Catalog     -40 to 105