High-Efficiency, Low-Emissions, Reinforced Digital Isolator With Integrated Power


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For guidelines on board design and layout, and to test for optimum emissions performance, please refer to this application report.


The ISOW784x is a family of high-performance, quad-channel reinforced digital isolators with an integrated high-efficiency power converter. The integrated DC-DC converter provides up to 650 mW of isolated power at high efficiency and can be configured for various input and output voltage configurations. Therefore these devices eliminate the need for a separate isolated power supply in space-constrained isolated designs.

The ISOW784x family of devices provide high electromagnetic immunity and low emissions while isolating CMOS or LVCMOS digital I/Os. The signal-isolation channel has a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier, whereas, power isolation uses on-chip transformers separated by thin film polymer as insulating material. Various configurations of forward and reverse channels are available. If the input signal is lost, the default output is high for the ISOW784x devices and low for the devices with the F suffix (see the Device Features).

These devices help prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry. Through innovative chip design and layout techniques, electromagnetic compatibility of the ISOW784x family of devices has been significantly enhanced to ease system-level ESD, EFT, surge and emissions compliance. The high-efficiency of the power converter allows operation at a higher ambient temperature. The ISOW784x family of devices is available in a 16-pin SOIC wide-body (SOIC-WB) DWE package.


  • Integrated High-Efficiency DC-DC Converter With On-Chip Transformer
  • 3-V to 5.5-V Wide Input Supply Range
  • Regulated 5-V or 3.3-V Output
  • Up to 0.65-W Output Power
  • 5 V to 5 V; 5 V to 3.3 V: Available Load Current ≥ 130 mA
  • 3.3 V to 3.3 V: Available Load Current ≥ 75 mA
  • Soft-Start to Limit Inrush Current
  • Overload and Short-Circuit Protection
  • Thermal Shutdown
  • Default Output: High and Low Options
  • Signaling Rate Up to 100 Mbps
  • Low Propagation Delay: 13 ns Typ (5-V Supply)
  • High CMTI: ±100 kV/µs Minimum
  • Robust Electromagnetic Compatibility (EMC)
    • System-Level ESD, EFT, and Surge Immunity
    • Low Emissions
  • 16-pin Wide SOIC Package
  • Extended Temperature Range: –40°C to +125°C
  • Safety-Related Certifications:
    • 7071-VPK Reinforced Isolation per DIN V VDE V 0884-11:2017-01
    • 5000-VRMS Isolation for 1 Minute per UL 1577
    • CSA Certification per IEC 60950-1, IEC 62368-1 and IEC 60601-1 End Equipment Standards
    • CQC Approval per GB4943.1-2011
    • TUV Certification According to EN 60950-1 and EN 61010-1

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Parametrics Compare all products in Digital Isolators

Integrated Isolated Power
Number of Channels (#)
Forward/Reverse Channels
Isolation Rating (Vrms)
Surge Voltage Rating (Vpk)
Data Rate (Max) (Mbps)
Propagation Delay (Typ) (ns)
Default Output
VCC (Min) (V)
VCC (Max) (V)
Operating Temperature Range (C)
ISOW7843 ISOW7843F ISOW7840 ISOW7841 ISOW7842 ISOW7844
Yes    Yes    Yes    Yes    Yes    Yes   
4    4    4    4    4    4   
1/3    1/3    4/0    3/1    2/2    0/4   
5000    5000    5000    5000    5000    5000   
6250    6250    6250    6250    6250    6250   
100    100    100    100    100    100   
13    13    13    13    13    13   
High    Low    High    High    High    High   
3    3    3    3    3    3   
5.5    5.5    5.5    5.5    5.5    5.5   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
16SOIC    16SOIC    16SOIC    16SOIC    16SOIC    16SOIC