Protecting RS-485 transceivers from sustained high voltage/electrical over-stress reference design


Design files


This reference design proposes an implementation of combining Positive Temperature Coefficient (PTC) fuses and Silicon Diode Alternating Current (SIDAC) devices to keep the transceivers alive under sustained exposure to high voltage. It highlights the capability of this particular protection device combination for RS-485 transceivers.

  • 15V low-voltage SIDAC
  • 120/240V PTC fuse
  • Extra pads for alternative device testing
  • Headers for easy connections

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.

TIDUER9.PDF (1321 K)

Reference design overview and verified performance test data

TIDM151.PDF (119 K)

Detailed schematic diagram for design layout and components

TIDM152.PDF (43 K)

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

TIDM153.PDF (71 K)

Detailed overview of design layout for component placement

TIDM155.ZIP (398 K)

Files used for 3D models or 2D drawings of IC components

TIDCFL7.ZIP (1668 K)

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

TIDM154.PDF (303 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

RS-485 & RS-422 transceivers

THVD15005-V RS-485 transceiver up to 500 kbps with ±8-kV IEC ESD protection

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Protecting RS-485 Transceivers from Sustained High-Voltage EOS Reference Design Sep. 06, 2019

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