ISOW7821 High-efficiency, low-emissions, reinforced digital isolator with integrated power |

ISOW7821 (ACTIVE) High-efficiency, low-emissions, reinforced digital isolator with integrated power



The ISOW7821 device is a high-performance, dual-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 this device eliminates the need for a separate isolated power supply in space-constrained isolated designs.

The ISOW7821 device provides 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 ISOW7821 device and low for the device 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 ISOW7821 device 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 ISOW7821 device 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
    • All Agency Certifications are Planned

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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) Operating temperature range (C)
ISOW7821 Order now Yes     2     1/1     5000     10000     100     9.5     11     13     High
3.3     5.5     -40 to 125    
ISOW7840 Order now Yes     4     4/0     5000     10000     100     5     5.75     13     High
3     5.5     -40 to 125    
ISOW7841 Order now Yes     4     3/1     5000     10000     100     5     5.75     13     High
3     5.5     -40 to 125    
ISOW7842 Order now Yes     4     2/2     5000     10000     100     5     6     13     High
3     5.5     -40 to 125    
ISOW7843 Order now Yes     4     1/3     5000     10000     100     4.75     6     13     High
3     5.5     -40 to 125    
ISOW7844 Order now Yes     4     0/4     5000     10000     100     4.75     6.25     13     High
3     5.5     -40 to 125