ISO1500 3-kVRMS basic isolated RS-485/RS-422 transceiver in ultra-small package |


3-kVRMS basic isolated RS-485/RS-422 transceiver in ultra-small package



The ISO1500 device is a galvanically-isolated differential line transceiver for TIA/EIA RS-485 and RS-422 applications. This device has a 3-channel digital isolator and an RS-485 transceiver in an ultra-small 16-pin SSOP package. The bus pins of this transceiver are protected against IEC ESD contact discharge and IEC EFT events. The receiver output has a failsafe for bus open, short, and idle conditions. The small solution size of ISO1500 greatly reduces the board space required compared to other integrated isolated RS-485 solutions or discrete implementation with optocouplers and non-isolated RS-485 transceiver.

The device is 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 3000 VRMS of isolation for 1 minute per UL 1577 between the bus-line transceiver and the logic-level interface.

The ISO1500 device can operate from 1.71 V to 5.5 V on side 1 which lets the devices interface with low-voltage FPGAs and ASICs. The supply voltage on side 2 is from 4.5 V to 5.5 V. This device supports a wide operating ambient temperature range from –40°C to +125°C.


  • Meets or Exceeds Requirements of TIA/EIA-485-A
  • Half-Duplex Transceiver
  • Low-EMI 1-Mbps Data Rate
  • 1.71-V to 5.5-V Logic-Side Supply (VCC1), 4.5-V to 5.5-V Bus-Side Supply (VCC2)
  • 1/8 Unit Load: Up to 256 Nodes On Bus
  • Failsafe Receiver For Bus Open, Short, and Idle
  • 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
  • Ultra-Small SSOP (DBQ-16) Package
  • Safety-Related Certifications:
    • All Certifications Planned
    • 4242-VPK VIOTM and 566-VPK VIORM per DIN V VDE V 0884-11:2017-01
    • 3000-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 reinforced working (Vrms) Datarate (Mbps) Duplex Integrated transformer driver Number of nodes HBM ESD (kV) Fail safe Operating temperature range (C)
ISO1500 Order now 2500     4000     566     3000     370     300     1     Half     No     256     16     Idle
-40 to 125