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ISO35T

ACTIVE

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

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Data sheet

ISO35T

ACTIVE
Data sheet Order now

Product details

Duplex Full Data rate (max) (MBits) 1 Withstand isolation voltage (VISO) (Vrms) 2500 VCC1 (min) (V) 3 VCC1 (max) (V) 3.6 Integrated isolated power Transformer driver Operating temperature range (°C) -40 to 85 VCC2 (min) (V) 3 VCC2 (max) (V) 3.6 Fail safe Idle, Open, Short ESD HBM (kV) 16 Rating Catalog Surge isolation voltage (VIOSM) (VPK) 4000
Duplex Full Data rate (max) (MBits) 1 Withstand isolation voltage (VISO) (Vrms) 2500 VCC1 (min) (V) 3 VCC1 (max) (V) 3.6 Integrated isolated power Transformer driver Operating temperature range (°C) -40 to 85 VCC2 (min) (V) 3 VCC2 (max) (V) 3.6 Fail safe Idle, Open, Short ESD HBM (kV) 16 Rating Catalog Surge isolation voltage (VIOSM) (VPK) 4000
SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • Designed for RS-485 and RS-422 Applications
  • Signaling Rates up to 1 Mbps
  • 1/8 Unit Load – up to 256 Nodes on a Bus
  • Thermal Shutdown Protection
  • Typical Efficiency > 60% (ILOAD = 100 mA)
    - See SLUU470
  • Low-Driver Bus Capacitance 16 pF (Typical)
  • Fail-Safe Receiver for Bus Open, Short, Idle
  • Logic Inputs are 5-V Tolerant
  • 50-kV/µs Typical Transient Immunity
  • Bus-Pin ESD Protection
    • 16-kV HBM Between Bus-Pins and GND2
    • 6-kV HBM Between Bus-Pins and GND1
  • Safety and Regulatory Approvals
    • 4242 VPK Basic Insulation per DIN V VDE V
      0884-10 and DIN EN 61010-1
    • 2500 VRMS Isolation for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A, IEC
      60950-1 and IEC 61010-1 Standards
  • Designed for RS-485 and RS-422 Applications
  • Signaling Rates up to 1 Mbps
  • 1/8 Unit Load – up to 256 Nodes on a Bus
  • Thermal Shutdown Protection
  • Typical Efficiency > 60% (ILOAD = 100 mA)
    - See SLUU470
  • Low-Driver Bus Capacitance 16 pF (Typical)
  • Fail-Safe Receiver for Bus Open, Short, Idle
  • Logic Inputs are 5-V Tolerant
  • 50-kV/µs Typical Transient Immunity
  • Bus-Pin ESD Protection
    • 16-kV HBM Between Bus-Pins and GND2
    • 6-kV HBM Between Bus-Pins and GND1
  • Safety and Regulatory Approvals
    • 4242 VPK Basic Insulation per DIN V VDE V
      0884-10 and DIN EN 61010-1
    • 2500 VRMS Isolation for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A, IEC
      60950-1 and IEC 61010-1 Standards

The ISO35T is an isolated differential line transceiver with integrated oscillator outputs that provide the primary voltage for an isolation transformer. The device is a full-duplex differential line transceiver for RS-485 and RS-422 applications that can easily be configured for half-duplex operation by connecting pin 11 to pin 14, and pin 12 to pin 13.

These devices are ideal for long transmission lines since the ground loop is broken to allow for a much larger common-mode voltage range. The symmetrical isolation barrier of the device is tested to provide 4242VPK of isolation per VDE for 60s 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 near-by sensitive circuitry if they are of sufficient magnitude and duration. The ISO35T can significantly reduce the risk of data corruption and damage to expensive control circuits.

The ISO35T is specified for use from –40°C to 85°C.

The ISO35T is an isolated differential line transceiver with integrated oscillator outputs that provide the primary voltage for an isolation transformer. The device is a full-duplex differential line transceiver for RS-485 and RS-422 applications that can easily be configured for half-duplex operation by connecting pin 11 to pin 14, and pin 12 to pin 13.

These devices are ideal for long transmission lines since the ground loop is broken to allow for a much larger common-mode voltage range. The symmetrical isolation barrier of the device is tested to provide 4242VPK of isolation per VDE for 60s 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 near-by sensitive circuitry if they are of sufficient magnitude and duration. The ISO35T can significantly reduce the risk of data corruption and damage to expensive control circuits.

The ISO35T is specified for use from –40°C to 85°C.
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Technical documentation

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Type Title Date
* Data sheet ISO35T Isolated 3.3V RS-485 Transceiver With Integrated Transformer Driver datasheet (Rev. D) PDF | HTML 21 Oct 2015
Certificate CSA Certificate for ISOxxTDW 21 Feb 2023
Certificate VDE Certificate for Basic Isolation for DIN EN IEC 60747-17 (Rev. U) 07 Feb 2023
More literature Isolation for RS-485 PDF | HTML 21 Aug 2022
Certificate UL Certificate of Compliance File E181974 Vol 4 Sec 2 10 Aug 2022
Application note Robust Isolated RS-485 Enables New Industrial Applications (Rev. C) PDF | HTML 26 Jul 2022
Application note 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 note How to Isolate Signal and Power for an RS-485 System (Rev. C) PDF | HTML 25 May 2021
Analog Design Journal 3Q 2011 Issue Analog Applications Journal 16 Sep 2011
Analog Design Journal Isolated RS-485 transceivers support DMX512 stage lighting & special-effects app 16 Sep 2011
Analog Design Journal Журнал по применению аналоговых компонентов 3Q 2011 01 Sep 2011
User guide ISO35T EVM-434 Description. (Rev. B) 01 Jun 2011
EVM User's guide ISO1176T/35T/3086T Evaluation Module User's Guide (Rev. A) 13 Jul 2010

Design & development

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

Evaluation board

ISO1176TEVM — ISO1176T Evaluation Module

This document describes the ISO1176T/35T/3086T Evaluation Module (EVM). It is used to evaluate the ISO1176T PROFIBUS Transceiver, the ISO35T RS-485 transceiver, or ISO3086T RS-485 Transceiver. Because the devices are similar transceivers, and the printed-circuit board is the same for all three (...)

User guide: PDF
Not available on TI.com
Evaluation board

ISO35TEVM — ISO35T Evaluation Module

This document describes the ISO1176T/35T/3086T Evaluation Module (EVM). It is used to evaluate the ISO1176T PROFIBUS Transceiver, the ISO35T RS-485 transceiver, or ISO3086T RS-485 Transceiver. Because the devices are similar transceivers, and the printed-circuit board is the same for all three (...)

User guide: PDF
Not available on TI.com
Evaluation board

ISO35TEVM-434 — ISO35T Small EVM

The smaller EVM version shows the customer the spaced required for their design. This circuit provides an isolated, 20 Mbps. 3.3V to 3.3V RS-485 interface using the ISO35T, isolated RS-485 transceiver and the TPS76333 high accuracy linear regulator. This circuit achieves signal and power (...)

User guide: PDF
Not available on TI.com
Simulation model

ISO35T IBIS MODEL (Rev. A)

SLLM134A.ZIP (187 KB) - IBIS Model
Download
Reference designs

TIDA-00057 — 1Mbps Isolated RS-485 Reference Design

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.
Test report: PDF
Schematic: PDF
Package Pins Download
SOIC (DW) 16 View options

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