Isolated Profibus Interface Reference Design


Design files


This reference design provides an isolated, 40-Mbps, 3.3-V to 5-V Profibus interface using the ISO1176T, isolated Profibus transceiver and the TPS76350 high-accuracy linear regulator. This circuit achieves signal and power isolation and at the same time decreases board space and power consumption.

  • 4000V peak isolation, 560V peak VIORM
  • Signaling rates up to 40Mbps
  • Differential output exceeds 2.1V (54 Ohm load)
  • Low bus capacitance of 10pF (Max)
  • Fail-safe receiver for bus open, short, or idle
  • 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.

TIDU162.PDF (620 K)

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

TIDR257.PDF (48 K)

Detailed schematic diagram for design layout and components

TIDR258.PDF (98 K)

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

TIDC181.ZIP (331 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

ISO1176T40-Mbps, half-duplex, 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-00005 Test Results Sep. 26, 2013

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