Robust transceivers deliver high working voltage and ultra-low EMI for IIoT networks

Intersil has two new high-speed, isolated RS485 differential bus transceivers that provide 40Mbps bidirectional data communication for 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 PLCs in factory automation applications. The transceivers provide additional advantages over other isolation technologies, including ultra-low radiated emission and EMI susceptibility, support for up to 160 devices on the bus, and an extended 125C temperature range. These devices leverage GMR technology that provides galvanic isolation to keep the communication bus free from common-mode noise generated in electrically noisy factory and building automation environments. In addition, the company’s GMR isolation does not require the elaborate encoding schemes found in capacitive and transformer-based isolators that use RF carriers or PWM to transfer DC and low frequency signals across the barrier. “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.”