SLLSEA5C March   2012  – March 2019 ISO7421E-Q1


  1. Features
  2. Applications
  3. Description
    1.     Simplified Schematic
  4. Pin Configuration and Functions
    1. Table 1. Pin Functions
  5. Electrostatic Discharge Caution
    1.     Device Images
      1. 5.1 Device Function Table
      2. 5.2 Available Options
  6. Absolute Maximum Ratings
  7. Thermal Information
  8. Recommended Operating Conditions
  9. Electrical Characteristics
  10. 10Switching Characteristics
  11. 11Electrical Characteristics
  12. 12Switching Characteristics
  13. 13Electrical Characteristics
  14. 14Switching Characteristics
  15. 15Electrical Characteristics
  16. 16Switching Characteristics
  17. 17Parameter Measurement Information
  18. 18Device Information
    1. 18.1 Package Characteristics
    2. 18.2 IEC 60664-1 Ratings Table
    3. 18.3 Insulation Characteristics
    4. 18.4 Regulatory Information
    5. 18.5 IEC Safety Limiting Values
    6. 18.6 Equivalent Input And Output Schematic Diagrams
  19. 19Typical Characteristics
  20. 20Revision History

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information


The ISO7421E-Q1 provides double galvanic isolation of up to 2.5 KVrms for 1 minute per UL. This digital isolator has two isolation channels in a bi-directional configuration. 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 require two supply voltages, 3.3 V or 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply.

Note: The ISO7421E-Q1 is specified for signaling rates up to 50 Mbps. Due to their fast response time, under most cases, these devices will also transmit data with much shorter pulse widths. Designers should add external filtering to remove spurious signals with input pulse duration < 20 ns if desired.

Simplified Schematic

ISO7421E-Q1 keygraphc_e39.gif
VCCI and GNDI are supply and ground connections respectively for the input channels.
VCCO and GNDO are supply and ground connections respectively for the output channels.