Industry's Smallest Isolated RS‑485 Transceiver
The ISL32704E isolated RS-485 transceiver provides 4Mbps bidirectional data transmission for Industrial Internet of Things networks. The high-speed device delivers industry-leading EMI and common-mode transient immunity in a small 4mm x 5mm QSOP package that's 70% smaller than competing solutions.
The ISL32704E transceiver simplifies PCB layout, reduces board space requirements, and enhances data transmission reliability and integrity.
- 4Mbps data rate
- 2.5kVRMS isolation per UL 1577
- 600VRMS working voltage per VDE 0884
- 3V to 5V power supplies
- Single unit load allows up to 32 devices on the bus
- 50kV/μs (typical), 30kV/μs (minimum) common-mode transient immunity
- 44000 years barrier life
- 15kV ESD bus-pin protection
- Low EMC footprint
- Thermal shutdown protection
- -40°C to +85°C temperature range
- Meets or exceeds ANSI RS-485
- 16 Ld QSOP package
- UL 1577 recognized
- VDE V0884-11 certification pending
The ISL32704E is a galvanically isolated, differential bus transceiver designed for bidirectional data transmission and meeting the RS-485 and RS-422 standards for balanced communication. Each of the bus terminals, A and B, is protected against ±15kV ESD strikes without latch-up.
The device uses Giant Magnetoresistance (GMR) as isolation technology. A unique ceramic/polymer composite barrier provides excellent isolation and virtually unlimited barrier life.
The part is available in a 16 Ld QSOP package, offering unprecedented miniaturization.
The ISL32704E delivers a minimum differential output voltage 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 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.
- Factory automation
- Security networks
- Building environmental control systems
- Industrial/process control networks
- Level translators (i.e., RS-232 to RS-485)
|Data Rate||4 Mbps|
|VDD1(V)||3V to 5.5V|
|VDD2(V)||4.5V to 5.5V|
|AN1973: GMR Isolators in IEC61010-1 Edition 3 Systems|
GMR Isolators in IEC61010-1 Edition 3 Systems
02 May 2016
|02 May 2016||94 KB|
|AN1972: Giant-Magneto-Resistance as Digital Isolation Technology|
Giant-Magneto-Resistance as Digital Isolation Technology
02 May 2016
|02 May 2016||155 KB|
|AN1971: GMR In Isolation|
GMR In Isolation
15 Apr 2016
|15 Apr 2016||132 KB|
Low-Cost Isolated RS-485 Transceiver
10 Feb 2017
|10 Feb 2017||382 KB|
|ISL32704EVAL1Z Design Files|
BOM, Artwork and Schematic Files for the ISL32704EVAL1Z Evaluation Board
10 Feb 2017
|ZIP||10 Feb 2017||375 KB|
|ISL32704EVAL1Z User Guide|
ISL32704EVAL1Z Evaluation Board User Guide
03 Jan 2017
|03 Jan 2017||295 KB|
|RS-485 Isolator Raises the Bar for Bus Node Designs|
24 Feb 2017
|24 Feb 2017||423 KB|