ISO1412 5-kVrms isolated RS-485/RS-422 transceiver with robust EMC |


5-kVrms isolated RS-485/RS-422 transceiver with robust EMC



The ISO141x devices are galvanically-isolated differential line transceivers for TIA/EIA RS-485 and RS-422 applications. These noise-immune transceivers are designed to operate in harsh industrial environments. The bus pins of these devices can endure high levels of IEC electrostatic discharge (ESD) and IEC electrical fast transient (EFT) events which eliminates the need for additional components on bus for system-level protection. The devices are available for both basic and reinforced isolation (see Reinforced and Basic Isolation Options).

These devices are used for long distance communications. Isolation breaks the ground loop between the communicating nodes, allowing for a much larger common mode voltage range. The symmetrical isolation barrier of each device is tested to provide 5000 VRMS of isolation for 1 minute per UL 1577 between the bus-line transceiver and the logic-level interface.

The ISO141x devices can operate from 1.71 V to 5.5 V on side 1 which lets the devices be interfaced with low voltage FPGAs and ASICs. The wide supply voltage on side 2 from 3 V to 5.5 V eliminates the need for a regulated supply voltage on the isolated side. These devices support a wide operating ambient temperature range from –40°C to +125°C.


  • Compatible With TIA/EIA-485-A
  • PROFIBUS Compatible at 5-V Bus-Side Supply
  • Bus I/O Protection
    • ± 30 kV HBM
    • ±16 kV IEC 61000-4-2 Contact Discharge
    • ± 4 kV IEC 61000-4-4 Electrical Fast transient
  • Low-EMI 500-kbps Data Rate
  • 1.71-V to 5.5-V Logic-Side Supply (VCC1), 3-V to 5.5-V Bus-Side Supply (VCC2)
  • Failsafe Receiver For Bus Open, Short, and Idle
  • 1/8 Unit Load up to 256 Nodes On Bus
  • 100-kV/µs (typical) High Common-Mode Transient Immunity
  • Extended Temperature Range from –40°C to +125°C
  • Glitch-Free Power-Up and Power-Down for Hot Plug-in
  • Wide-Body SOIC-16 Package
  • Pin Compatible to Most Isolated RS-485 Transceivers
  • Safety-Related Certifications:
    • All Certifications Planned
    • 7071-VPK VIOTM and 1500-VPK VIORM (Reinforced and Basic Options) per DIN V VDE V 0884-11:2017-01
    • 5000-VRMS Isolation for 1 Minute per UL 1577
    • IEC 60950, IEC 60601 and EN 61010 Certifications
    • CQC, TUV, and CSA Certifications

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Part number Order Isolation rating (Vrms) Surge voltage capability (Vpk) DIN V VDE V 0884-10 working voltage (Vpk) CSA isolation rating (Vrms) CSA 60950-1 basic working (Vrms) CSA 61010-1 basic working (Vrms) CSA 61010-1 reinforced working (Vrms) Datarate (Mbps) Duplex Integrated transformer driver Number of nodes HBM ESD (kV) Fail safe Operating temperature range (C)
ISO1412 Order now 5000     10000
1500     5000     800    
250     0.5     Full     No     256     30     Idle
-40 to 125    
ISO1410 Samples not available 5000     10000
1500     5000     800    
250     0.5     Half     No     256     30     Idle
-40 to 125