ISO3086T 20-Mbps full-duplex 2.5-kVrms isolated RS-485/RS-422 transceiver with integrated transformer driver |

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20-Mbps full-duplex 2.5-kVrms isolated RS-485/RS-422 transceiver with integrated transformer driver



The ISO3086T is an isolated differential line transceiver with integrated oscillator outputs that provide the primary voltage for an isolation transformer. The device is a full-duplex differential line transceiver for RS-485 and RS-422 applications that can easily be configured for half-duplex operation by connecting pin 11 to pin 14, and pin 12 to pin 13.

These devices are ideal for long transmission lines since the ground loop is broken to allow for a much larger common-mode voltage range. The symmetrical isolation barrier of the device is tested to provide 4242 VPK of isolation for 1 minute per VDE between the bus-line transceiver and the logic-level interface.

Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can cause damage to the transceiver and/or near-by sensitive circuitry if they are of sufficient magnitude and duration. These isolated devices can significantly increase protection and reduce the risk of damage to expensive control circuits.

The ISO3086T is specified for use from –40°C to 85°C.


  • Meets or Exceeds TIA/EIA-485-A
  • Signaling Rate up to 20 Mbps
  • 1/8 Unit Load – Up to 256 Nodes on a Bus
  • Thermal Shutdown Protection
  • Typical Efficiency > 60% (ILOAD = 100 mA) -
    see SLUU469
  • Low Bus Capacitance 7 pF (Typ)
  • 50-kV/µs Typical Transient Immunity
  • Fail-safe Receiver for Bus Open, Short, Idle
  • Logic Inputs are 5-V Tolerant
  • Bus-Pin ESD Protection
    • 11-kV HBM Between Bus-Pins and GND2
    • 6-kV HBM Between Bus-Pins and GND1
  • Safety and Regulatory Approvals
    • 4242 VPK Basic Insulation per DIN V VDE V
      0884-10 and DIN EN 61010-1
    • 2500 VRMS Isolation for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A, IEC
      60950-1 and IEC 61010-1 Standards


Compare all products in Isolated RS-485 transceivers Email Download to Excel
Part number Order Isolation rating (Vrms) Surge voltage capability (Vpk) Data rate (Max) (Mbps) Duplex Integrated transformer driver Number of nodes HBM ESD (kV) Fail safe Operating temperature range (C)
ISO3086T Order now 2500     4000     20     Full     Yes     256     11     Idle
-40 to 85    
ISO1176T Order now 2500     4000     40     Half     Yes     256     10     Idle
-40 to 85    
ISO35T Order now 2500     4000     1     Full     Yes     256     16     Idle
-40 to 85