ISO7420FE Low-Power Dual Channel Digital Isolators



Low-Power Dual Channel Digital Isolators


ISO7420E, ISO7420FE, ISO7421E and ISO7421FE provide galvanic isolation up to 2.5 KVRMSfor 1 minute per UL. These devices have two isolated channels. Each channel has a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuit from entering the local ground and interfering with or damaging sensitive circuitry. The suffix F indicates low-output option in fail-safe condition.

These devices have TTL input thresholds and operate from 3V to 5.5V supplies. All inputs are 5V tolerant when supplied from a 3.3V supply.

  • Signaling Rate > 50 Mbps
  • For Devices with Suffix F, Output is low in fail-safe mode
  • Low Power Consumption: Typical ICC per Channel (3.3V Supplies):
    • ISO7420: 1.4mA at 1Mbps, 2.5mA at 25Mbps
    • ISO7421: TBDmA at 1Mbps, TBDmA at 25Mbps
  • Low Propagation Delay: 7ns (Typical)
  • Low Pulse Skew: 200 ps (Typical)
  • Wide TA Range Specified: –40°C to 125°C
  • 50 KV/µs Transient Immunity, Typical
  • Isolation barrier life: > 25 Years
  • Operates from 3V to 5.5V Supply Levels
  • Narrow Body SOIC-8 Package
    • Opto-coupler Replacement in:
      • Industrial FieldBus
        • ProfiBus
        • ModBus
        • DeviceNet™ Data Buses
      • Servo Control Interface
      • Motor Control