1Mbps Isolated RS-485 Reference Design


Design files


This reference design provides an isolated, 1-Mbps, 3.3-V to 3.3-V RS-485 interface using the ISO35T, isolated RS-485 transceiver and the TPS76333 high-accuracy linear regulator. This board achieves signal and power isolation and at the same time decreases board space and power consumption.

  • 4000V peak isolation
  • 1/8 unit load - up to 256 nodes on a bus
  • Signaling rates up to 1Mbps
  • 50kV/us typical transient immunity
  • This reference design is orderable

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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.

TIDU163.PDF (137 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDR259.PDF (162 K)

Detailed schematic diagram for design layout and components

TIDR260.PDF (98 K)

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

TIDC182.ZIP (323 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

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

Data sheet: PDF | HTML
Signal isolators with integrated power

ISO35T1-Mbps full-duplex 2.5-kVrms isolated RS-485 & RS-422 transceiver with integrated transformer driver

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report TIDA-00057 Test Results Sep. 26, 2013

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