Electronic Component Solutions

High-Speed Isolated 3.3 V Bus RS-485 Transceiver

IL3685-Series galvanically isolated, high-speed differential bus transceivers are designed for bidirectional data communication on balanced transmission lines.

A unique ceramic/polymer composite barrier provides excellent isolation and virtually unlimited barrier life.
The IL3685P delivers at least 1.5 V into a 54 Ω load for excellent data integrity over long cable lengths. The device is compatible with 3.3 V RS-485 busses and 3.3 V or 5 V controller interfaces.
Current limiting and thermal shutdown features protect against output short circuits and bus contention that may cause excessive power dissipation. Receiver inputs feature a “fail-safe if open” design, ensuring a logic high R-output if A/B are floating.

  • 3.3 V bus
  • Up to 40 Mbps data rate
  • 1/5 unit load (supports up to 160 nodes)
  • 20 ns propagation delay
  • 5 ns pulse skew
  • 50 kV/μs typ.; 30 kV/μs min. common mode transient immunity
  • 44000 year barrier life
  • 16.5 kV bus ESD protection
  • Low EMC footprint
  • Thermal shutdown protection
  • −40 °C to +85 °C temperature range
  • Meets or exceeds ANSI RS-485 and ISO 8482:1987(E)
  • 600 VRMS working voltage
  • 2500 VRMS isolation voltage
  • VDE V 0884-11 certified and UL 1577 approved
  • 0.3″ True 8™ mm 16-pin SOIC package


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