Dual Isolated Half-Duplex RS-485 Repeater Reference Design


Design files


This reference design demonstrates a dual isolated, half-duplex repeater with data rate independent flow-control for long-haul RS-485 networks suitable for industrial applications. The design provides transient protection protecting the signal path against ESD, EFT, and surge transients specified in the IEC 61000 family of transient immunity standards.

  • Data rate up to 100kbps    
  • Data rate independent flow control    
  • 4kV peak isolation    
  • IEC 61000-4-2 up to 16kV    
  • IEC 61000-4-4 up to 4kV    
  • IEC 61000-4-5 up to 1kV
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU590.PDF (570 K)

Reference design overview and verified performance test data

TIDC745.ZIP (301 K)

Detailed schematic diagram for design layout and components


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

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ISO3082200-Kbps, half-duplex, 2.5-kVrms isolated RS-485 & RS-422 transceiver

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TPS763150-mA, 10-V, low-dropout voltage regulator with enable

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Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

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Technical documentation

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Type Title Date
Technical article RS-485 basics: Introduction PDF | HTML Apr. 28, 2015
Design guide Dual Isolated Half-Duplex RS-485 Repeater Design Guide (TIDA-00333) Oct. 10, 2014

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