Intersil Introduces High-Speed RS-485 Transceivers with Highest Reinforced Isolation

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Robust ISL32741E and ISL32740E deliver industry's highest working voltage and ultra-low EMI for industrial IoT networks

28 Aug 2017

MILPITAS, Calif., Aug. 28, 2017 /PRNewswire/ -- Intersil, a subsidiary of Renesas Electronics Corporation (TSE: 6723), today announced two new high-speed, isolated RS-485 differential bus transceivers that provide 40Mbps bidirectional data communication for Industrial Internet of Things (IIoT) networks. The ISL32741E offers 1,000VRMS working voltage and 6kV of reinforced isolation, more than 2x higher than competitive solutions. The higher working voltage and reinforced isolation is required for today's most rigorous medical and high-speed motor control applications. The ISL32740E with 2.5kV of isolation and 600VRMS working voltage comes in the industry's smallest package, enabling high channel density for programmable logic controllers (PLCs) in factory automation applications.

The ISL3274xE transceivers are ideally suited for the equipment-to-bus interface in PROFIBUS DP and high-speed RS-485 networks that connect PLCs to instruments, robots, motor control drives, as well as data acquisition and digital I/O modules. In addition to not requiring any shielding, these transceivers simplify PCB layout, use less board space, and enhance data transmission reliability and integrity. The ISL3274xE devices also offer low power consumption. For example, the ISL32740EIAZ's 60mA supply current allows it to operate in a tiny 4mm x 5mm QSOP package at maximum speed without overheating.


On the non-isolated control-side, the ISL3274xE transceivers support direct connection to a 3V microcontroller (MCU) while the isolated bus-side connects to a higher voltage 5V supply for communication of strong bus signals across 100 meters and longer distances. The ISL3274xE transceivers are fully compliant with the EN 50081 and EN 50082-2 electromagnetic compatibility (EMC) standards and the umbrella line-voltage standard for information technology equipment (ITE) EN 61000.


"Our latest high-speed RS-485 isolated transceivers radiate virtually no EMI, and they eliminate ground loops between bus nodes to protect data transmission," said Philip Chesley, vice president of Industrial Analog and Power products at Intersil. "The ISL32741E's high working voltage and ability to push its reinforced isolation barrier up to 6kV enables customers to solve their most difficult IIoT networking design problems."


Key Features and Specifications of ISL32741E and ISL32740E Family

  • 40Mbps data rate enables high-speed data transmission
  • Supports 3V to 5V power supplies
  • Offers 5ns pulse skew and 20ns propagation delay
  • The ISL32741E offers 6kVRMS isolation/1,000VRMS working voltage, and 12.8kV surge immunity
  • The ISL32740E offers 2.5kVRMS isolation/600VRMS working voltage
  • Single unit load allows up to 160 devices on the bus
  • 50kV/µs (typ), 30kV/µs (min) common-mode transient immunity provides reliable data transmission in noisy environments
  • Offers a barrier lifetime of 44,000 years
  • 15kV ESD bus-pin protection, and low EMC footprint
  • Thermal shutdown protection prevents damage during bus contention, or excessive current
  • PROFIBUS compliant


The ISL3274xE can be combined with the ISL28025 precision digital power monitor, ISL12022M low power real time clock, and Renesas MCUs to create a system solution.


Pricing and Availability

The ISL32740E and ISL32741E 40Mbps RS-485 transceivers are available now with prices ranging from USD$3.79 to USD$4.79 depending on package type and temperature range. Evaluation boards are available for $99 USD. For more information, please visit


Device Working Voltage (V) Isolation Voltage (kV) Package
Temp Range (°C) Pricing
(1k units)
ISL32740EIAZ 600 2.5 QSOP -40 to 85 USD$3.79
ISL32740EIBZ 600 2.5 SOIC-W -40 to 85 USD$4.09
ISL32740EFBZ 600 2.5 SOIC-W -40 to 125 USD$4.29
ISL32741EIBZ 1000 6 SOIC-W -40 to 85 USD$4.29
ISL32741EFBZ 1000 6 SOIC-W -40 to 125 USD$4.49

Intersil and the Intersil logo are trademarks or registered trademarks of Intersil, a Renesas Company. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners.


The content in the press release, including, but not limited to, product prices and specifications, is based on the information as of the date indicated on the document, but may be subject to change without prior notice.