TIDUF92 December   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Wired System Description
    2. 1.2 Wireless System Description
    3. 1.3 Power Supply Options
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 BQ79718B-Q1
      2. 2.3.2 TPS3436-Q1
      3. 2.3.3 TPS715-Q1
      4. 2.3.4 TPD6E004
      5. 2.3.5 CC2662R-Q1
      6. 2.3.6 TXU0204-Q1
      7. 2.3.7 ISO7741-Q1
      8. 2.3.8 ESD2CAN24-Q1
      9. 2.3.9 LM5168-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
      1. 3.2.1 Hardware Setup
      2. 3.2.2 Software Setup
    3. 3.3 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

2.3.7 ISO7741-Q1

The ISO774x-Q1 (wired and wireless operation) automotive devices feature high-performance, quad-channel digital isolators with 5700VRMS (DWW package), 5000VRMS (DW package), and 3000VRMS (DBQ package) isolation ratings per UL1577. This family of devices provides reinforced insulation ratings according to VDE, CSA, TUV and CQC.

The ISO774x-Q1 devices provide high electromagnetic immunity and low emissions at low power consumption, while isolating CMOS and LVCMOS digital I/Os. Each isolation channel features a logic input and output buffer separated by a double capacitive silicon dioxide (SiO2) insulation barrier. These devices include enable pins which can be used to put the respective outputs in high impedance for multi-controller driving applications and to reduce power consumption. The ISO7740-Q1 device features all four channels in the same direction, the ISO7741-Q1 device features three forward and one reverse-direction channels, and the ISO7742-Q1 device features two forward and two reverse-direction channels. If the input power and signal are lost, default output remains high for devices without suffix F and low for devices with suffix F.

TIDA-020076 ISO7741-Q1 Block DiagramFigure 2-7 ISO7741-Q1 Block Diagram

Key features of the ISO7741-Q1 include:

  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to 125°C ambient operating temperature
  • Functional safety-capable:
    • Documentation available to aid functional safety system design: ISO7740-Q1, ISO7741-Q1, ISO7742-Q1
  • 100Mbps data rate
  • Robust isolation barrier:
    • > 30year projected lifetime at 1500VRMS working voltage
    • Up to 5700VRMS isolation rating
    • Up to 12.8kV surge capability
    • ±100kV/μs typical CMTI
  • Wide supply range: 2.2V to 5.5V
  • 2.25V to 5.5V level translation
  • Default output high (ISO774x ) and low (ISO774xF) options
  • Low power consumption, typical 1.5mA per channel at 1Mbps
  • Low propagation delay: 10.7ns typical (5V Supplies)
  • Robust electromagnetic compatibility (EMC):
    • System-level ESD, EFT, and surge immunity
    • ±8kV IEC 61000-4-2 contact discharge protection across isolation barrier
    • Low emissions
  • Extra-wide SOIC (DWW-16), wide-SOIC (DW-16) and QSOP (DBQ-16) package options
  • Safety-related certifications:
    • DIN EN IEC 60747-17 (VDE 0884-17)
    • UL 1577 component recognition program
    • IEC 61010-1, IEC 62368-1, IEC 60601-1, and GB 4943.1 certifications