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Isolated RS-485 transceivers

ISO35

ACTIVE

1-Mbps, full-duplex, 2.5-kVrms isolated RS-485 & RS-422 transceiver

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Data sheet

ISO35

ACTIVE
Data sheet Order now

Product details

Rating Catalog Integrated isolated power No Isolation rating Basic Duplex Full Data rate (max) (Mbps) 1 Working isolation voltage (VIOWM) (Vrms) 400 Surge isolation voltage (VIOSM) (VPK) 4000 Transient isolation voltage (VIOTM) (VPK) 4000 Withstand isolation voltage (VISO) (Vrms) 2500 ESD HBM (kV) 16 VCC1 (min) (V) 3.15 VCC1 (max) (V) 3.6 VCC2 (min) (V) 3.15 VCC2 (max) (V) 3.6 Fail safe Idle, Open, Short CMTI (min) (kV/µs) 25 Operating temperature range (°C) -55 to 125 Creepage (min) (mm) 8.34 Clearance (min) (mm) 8.34
Rating Catalog Integrated isolated power No Isolation rating Basic Duplex Full Data rate (max) (Mbps) 1 Working isolation voltage (VIOWM) (Vrms) 400 Surge isolation voltage (VIOSM) (VPK) 4000 Transient isolation voltage (VIOTM) (VPK) 4000 Withstand isolation voltage (VISO) (Vrms) 2500 ESD HBM (kV) 16 VCC1 (min) (V) 3.15 VCC1 (max) (V) 3.6 VCC2 (min) (V) 3.15 VCC2 (max) (V) 3.6 Fail safe Idle, Open, Short CMTI (min) (kV/µs) 25 Operating temperature range (°C) -55 to 125 Creepage (min) (mm) 8.34 Clearance (min) (mm) 8.34
SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • Meets or exceeds TIA/EIA RS-485 requirements
  • 1/8 unit load – Up to 256 nodes on a bus
  • Signaling rates up to 1 Mbps
  • Thermal shutdown protection
  • Low bus capacitance – 16 pF (typical)
  • 50 kV/µs typical transient immunity
  • Fail-safe receiver for bus open, short, idle
  • 3.3-V inputs are 5-V tolerant
  • Safety and regulatory approvals
    • 4000-V PK V IOTM, 560-V PK V IORM per DIN EN IEC 60747-17 (VDE 0884-17)
    • 2500 V RMS isolation rating per UL 1577
    • 2500 V RMS isolation rating per CSA 62368-1.
  • Meets or exceeds TIA/EIA RS-485 requirements
  • 1/8 unit load – Up to 256 nodes on a bus
  • Signaling rates up to 1 Mbps
  • Thermal shutdown protection
  • Low bus capacitance – 16 pF (typical)
  • 50 kV/µs typical transient immunity
  • Fail-safe receiver for bus open, short, idle
  • 3.3-V inputs are 5-V tolerant
  • Safety and regulatory approvals
    • 4000-V PK V IOTM, 560-V PK V IORM per DIN EN IEC 60747-17 (VDE 0884-17)
    • 2500 V RMS isolation rating per UL 1577
    • 2500 V RMS isolation rating per CSA 62368-1.

The ISO15 is an isolated half-duplex differential line transceiver while the ISO35 is an isolated full-duplex differential line driver and receiver for TIA/EIA 485/422 applications. The ISO15M and ISO35M have extended ambient temperature ratings of –55°C to 125°C while the ISO15 and ISO35 are specified over –40°C to 85°C.

These devices are ideal for long transmission lines because the ground loop is broken to allow for a much larger common-mode voltage range. The symmetrical barrier of the device is tested to provide isolatlion of 4000 V PK per VDE and 2500 V RMS per UL and CSA between the bus-line transceiver and the logic-level interface.

Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can cause damage to the transceiver and/or nearby sensitive circuitry if they are of sufficient magnitude and duration. These isolated devices can significantly increase protection and reduce the risk of damage to expensive control circuits.

The ISO15 is an isolated half-duplex differential line transceiver while the ISO35 is an isolated full-duplex differential line driver and receiver for TIA/EIA 485/422 applications. The ISO15M and ISO35M have extended ambient temperature ratings of –55°C to 125°C while the ISO15 and ISO35 are specified over –40°C to 85°C.

These devices are ideal for long transmission lines because the ground loop is broken to allow for a much larger common-mode voltage range. The symmetrical barrier of the device is tested to provide isolatlion of 4000 V PK per VDE and 2500 V RMS per UL and CSA between the bus-line transceiver and the logic-level interface.

Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can cause damage to the transceiver and/or nearby sensitive circuitry if they are of sufficient magnitude and duration. These isolated devices can significantly increase protection and reduce the risk of damage to expensive control circuits.
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Technical documentation

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Type Title Date
* Data sheet ISOx5 Isolated 3.3-V Half- and Full-Duplex RS-485 Transceivers datasheet (Rev. H) PDF | HTML 18 Aug 2023
Certificate VDE Certificate for Basic Isolation for DIN EN IEC 60747-17 (Rev. W) 31 Jan 2024
Certificate CSA Certificate for ISO1176DW, ISO308xDW, ISO15xDW, ISO035xDW 22 Mar 2023
Application note Isolated RS-485 Transceiver Reference Design (Rev. A) PDF | HTML 23 Sep 2022
Certificate UL Certificate of Compliance File E181974 Vol 4 Sec 2 10 Aug 2022
Application brief Robust Isolated RS-485 Enables New Industrial Applications (Rev. C) PDF | HTML 26 Jul 2022
Application brief How to Isolate RS-485 for Smallest Size and Highest Reliability (Rev. C) PDF | HTML 06 Jul 2022
White paper Why are Digital Isolators Certified to Meet Electrical Equipment Standards? 16 Nov 2021
White paper Distance Through Insulation: How Digital Isolators Meet Certification Requiremen PDF | HTML 11 Jun 2021
Application brief How to Isolate Signal and Power for an RS-485 System (Rev. C) PDF | HTML 25 May 2021
More literature Blog: Top 7 design questions about isolated RS-485 transceivers 06 Aug 2018
EVM User's guide ISO485EVM Isolated RS-485 EVM (Rev. A) 07 Feb 2018

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

ISO485EVM — ISO485EVM Evaluation Module

The ISO485 evaluation module (EVM) supports the parametric evaluation of RS-485 digital isolators. The EVM will be delivered with an ISO3082DW factory installed on the board. This EVM is intended to be used with the ISO15, ISO35 (SLOS580) and ISO3080, ISO3082, ISO3086 or ISO3088 (SLOS581). If (...)
User guide: PDF
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Simulation model

ISO35 IBIS Model

SLLC331.ZIP (12 KB) - IBIS Model
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Reference designs

TIDA-00486 — Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design

TIDA-00486 uses our SimpleLink Wi-Fi® CC3200 Internet-on-a-chip wireless MCU module to create a data bridge between an RS-485 network and a Wi-Fi network. The ISO15 transceiver provides an isolated RS-485 interface with up to 2500 VRMS of isolation. The LM5160 Fly-Buck™ power supply (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOIC (DW) 16 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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