Small Form Factor, Half-Duplex With Isolated & Non-Isolated RS485 Interface Reference Design
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Key Document


RS485 (Isolated, Non-isolated) is a popular interface for the Grid Infrastructure space, and is one of the most important options on newly designed equipment. TIDA-00308 will enable customers to quickly evaluate and design with TI RS485 devices for 3 different application scenarios, with an isolated power supply provided in this design. Additionally, test results in the user’s guide will demonstrate the IEC61000-4-2 ESD and IEC61000-4-5 surge tests performed on this design.

  • One design demonstrates three RS485 application scenarios
  • Two isolated power are provided, 5V and 3.3V
  • RS485 transmit and receive status are indicated by LED
  • Same design is compatible to multiple TI isolation devices to meet different application needs
  • Designed for IEC-61000 compliance
    • IEC-61000-4-2: ESD up to 4KV contact
    • IEC-61000-4-5: Surge up to ±1KV
  • Targeted for applications such as 
    • Interface through isolator 
    • Non-isolated RS485 transceiver 
    • Isolated RS485 transceiver

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Test Data

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Design Files

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ISO3088  20-Mbps, half-duplex, 2.5-kVrms isolated RS-485 & RS-422 transceiver  Isolated interface ICs  Sample & Buy View Design Kits & Evaluation Modules
ISO7221A  Dual-channel, TTL, 1/1, 1-Mbps digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies  Power for signal isolators  Sample & Buy View Design Kits & Evaluation Modules
SN65HVD3082E  Half-duplex RS-485 transceiver  Interface  Sample & Buy View Design Kits & Evaluation Modules
TLV704  150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ISO3088 Download Download
ISO7221A Download Download
Download -
SN6501 Download Download
SN65HVD3082E Download Download
Download Download
Download Download
TLV704 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 5610 13 Oct 2016
Design files (6)
Title Type Size (KB) Date
ZIP 196 09 Oct 2014
ZIP 2513 09 Oct 2014
PDF 105 09 Oct 2014
ZIP 586 09 Oct 2014
PDF 52 09 Oct 2014
PDF 532 09 Oct 2014

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