The ISL32705E is a galvanically isolated, full-duplex differential bus transceiver, designed for bidirectional data transmission meeting the RS-485 and RS-422 standards for balanced communication. All bus terminals are protected against ±7kV ESD strikes without latch-up. The device uses Giant Magnetoresistance (GMR) as isolation technology. A unique ceramic/polymer composite barrier provides excellent isolation and nearly unlimited barrier life. The part is available in a 16 Ld wide-body SOIC package providing true 8mm creepage distance. The ISL32705E delivers a minimum of 1. 5V into a 54Ω differential load for excellent data integrity over long cable lengths. The device is compatible with 3V and 5V input supplies, allowing an interface to standard microcontrollers without additional level shifting. Current limiting and thermal shutdown features protect against output short-circuits and bus contention that may cause excessive power dissipation. Receiver inputs feature a “fail-safe if open” design, ensuring a logic high R-output if A/B are floating.


  • 4Mbps data rate
  • 2.5kVRMS isolation/600VRMS working voltage
  • 3V to 5V power supplies
  • Drives up to 44 devices on an isolated bus
  • 50kV/μs (typical), 30kV/μs (minimum) common-mode transient immunity
  • 44,000 year barrier life
  • 7kV ESD protection
  • Low EMC footprint
  • Thermal shutdown protection
  • -40°C to +85°C temperature range
  • Meets or exceeds ANSI RS-485
  • 0.3" true 8mm 16 Ld SOIC package
  • UL 1577 recognized
  • VDE V 0884-10 certified

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active SOICW Tube 46
Active SOICW Reel 1000
Active SOICW Reel 250

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL32705E Datasheet Datasheet PDF 951 KB
User Guides & Manuals
ISL32705EVAL1Z User Guide Manual PDF 632 KB
Application Notes & White Papers
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses Application Note PDF 178 KB
AN1991: Isolating RS-485 Interfaces with High-Speed Digital Optocouplers Application Note PDF 513 KB
AN1990: RS-485 Transceivers in J1708 Physical Layer Applications of Heavy Duty Vehicles Application Note PDF 826 KB
AN1988: Isolated RS-485 Repeaters, the Backbone of Industrial Long Haul Networks Application Note PDF 769 KB
AN1987: RS-485 External Fail-Safe Biasing for Isolated Long Haul Buses Application Note PDF 443 KB
AN1986: External Fail-Safe Biasing of RS-485 Networks Application Note PDF 582 KB
AN1985: Transient Protection for the Standard RS-485 Transceiver: ISL3152E Application Note PDF 335 KB
AN1989: RS-422 vs RS-485: Similarities and Key Differences Application Note PDF 440 KB
AN1976: Important Transient Immunity Tests for RS-485 Networks Application Note PDF 338 KB
AN1979: Surge Protection simplified with Intersil's Overvoltage Protected (OVP) Transceivers Application Note PDF 500 KB
AN1977: Transient Voltage Suppressors: Operation and Features Application Note PDF 365 KB
AN1980: Ground Potential Differences: Origin and Remedies Application Note PDF 375 KB
AN1978: Surge Protection for Intersil's Standard RS-485 Transceivers Application Note PDF 369 KB
AN1972: Giant-Magneto-Resistance as Digital Isolation Technology Application Note PDF 296 KB
AN1973: GMR Isolators in IEC61010-1 Edition 3 Systems Application Note PDF 213 KB
AN1971: GMR In Isolation Application Note PDF 218 KB
ISL32705EVAL1Z Design Files Design File ZIP 269 KB
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB
PIN19028 - Q3 Cy 19 Price Increase Notice Price Increase Notice PDF 208 KB
TB506: Functional Principles of RS-485 Drivers and Receivers Other PDF 156 KB
TB509: Detecting Bus Signals Correctly with Failsafe Biased RS-485 Receivers Other PDF 240 KB
TB511: The Unit Load Concept Other PDF 253 KB
TB510: Transmitting Full-Duplex Data over Single Twisted Pair Cable Other PDF 500 KB