ISO7731B 高速、基本絶縁トリプルチャネル・デジタル・アイソレータ |

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The ISO7731B device is a high-performance, triple-channel digital isolator with 5000 VRMS isolation ratings per UL 1577 and 8000 VPK basic insulation according to VDE.

The ISO7731B device provides high electromagnetic immunity and low emissions at low power consumption, while isolating CMOS or LVCMOS digital I/Os. Each isolation channel has a logic input and output buffer separated by a double capacitive silicon dioxide (SiO2) insulation barrier. This device comes with enable pins which can be used to put the respective outputs in high impedance for multi-master driving applications and to reduce power consumption. The ISO7731B device has two forward and one reverse-direction channels. If the input power or signal is lost, the default output is high for device without suffix F and low for device with suffix F. See the Device Functional Modes section for further details.

Used in conjunction with isolated power supplies, this device helps prevent noise currents on data buses, such as RS-485, RS-232, and CAN, 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 ISO7731B device has been significantly enhanced to ease system-level ESD, EFT, surge, and emissions compliance. The ISO7731B device is available in 16-pin wide-SOIC package.


  • 100 Mbps Data Rate
  • Robust Isolation Barrier:
    • >100-Year Projected Lifetime at 1 kVRMS Working Voltage
    • Up to 5000 VRMS Isolation Rating
    • ±100 kV/µs Typical CMTI
  • Wide Supply Range: 2.25 V to 5.5 V
  • 2.25-V to 5.5-V Level Translation
  • Default Output High (ISO7731B) and Low (ISO7731FB) Options
  • Wide Temperature Range: –55°C to +125°C
  • Low Power Consumption, Typical 1.7 mA per Channel at 1 Mbps
  • Low Propagation Delay: 11 ns Typical
    (5-V Supplies)
  • Robust Electromagnetic Compatibility (EMC)
    • System-Level ESD, EFT, and Surge Immunity
    • ±8 kV IEC 61000-4-2 Contact Discharge Protection across Isolation Barrier
    • Low Emissions
  • Wide-SOIC (DW-16) Package
  • Safety-Related Certifications:
    • Basic Insulation per DIN V VDE V 0884-11:2017-01
    • UL 1577 Component Recognition Program
    • CSA Certification per IEC 60950-1 and IEC 62368-1 End Equipment Standards
    • CQC Certification per GB4943.1-2011
    • TUV Certification according to EN 60950-1 and EN 61010-1
    • CQC Certification Planned; All Other Certifications Complete

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Part number オーダー・オプション 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) Rating Operating temperature range (C)
ISO7731B ご注文 No     3     2/1     5000     7800     100     0.97     1.53     10.7     High
2.25     5.5     Catalog     -55 to 125    
ISO7731 ご注文 No     3     2/1     5000
100     0.97     1.53     10.7     High
2.25     5.5     Catalog     -55 to 125