Renesas Introduces 5V RS-485/422 Family of Transceivers with Highest EFT Immunity in the Industry

TOKYO – (COMMERCIAL THREAD) – Renesas Electronics Corporation (TSE: 6723), a leading provider of advanced semiconductor solutions, today introduced the RAA78815x family of RS-485/422 5V differential transceivers with immunity to peak electrical fast transients (EFT) – ± 5000 V – and ESD protection up to ± 16000 V, making these products the ideal solution for noise sensitive industrial communication networks. The six new rugged full-duplex and half-duplex devices meet RS-485 and RS-422 communication standards and are ideally suited for a variety of industrial network, process control network, building automation applications , long distance network and security camera network.

The new devices build on Renesas’ current family of RS-485 ISL315x 5V transceivers with additional immunity for EFT. In addition to the industry’s highest EFT immunity, the RAA78815x family provides exceptional differential output voltages, with 3.1 V into the 54 Ω load required by RS-485. Newer high speed transceivers also feature bus leakage currents of up to 125A, which represents an actual load of 1/8 unit on the RS-485 bus. Developers can connect up to 512 transceivers on the same bus without using repeaters and without compromising the maximum load of 32 units of the RS-485 network standard. As a result of these changes, the RAA78815x family can reduce implementation costs and downtime, as a single network can support more nodes with a lower likelihood of communication problems due to ESD surge transients. and EFT.

“EFT immunity is mission critical for devices operating in harsh industrial and automation environments, such as HVAC, factory, and smart grid equipment, where devices are frequently turned on and off or added and disconnected. of the system, ”said Bobby Matinpour, vice president of the Standard Products Division at Renesas. With superior EFT immunity, output control and supply current levels, the RAA78815x family leverages 50 years of experience in designing RS-485/422 transceivers to provide robust solutions. for industrial and factory automation. ”

Main features of the RAA78815x family

  • ± 5000V EFT immunity

  • ± 16,000 V ESD immunity

  • 3.1V (typical) in RD = 54Ω

  • Low bus current of 125 A, supply current of 550 A and shutdown current of 70 nA

  • Ultra-small 3x5mm MSOP and 6×8.6mm SOIC enclosure

  • Support for multiple data rates and full duplex (RAA788150, RAA788153 and RAA788156) and half (RAA788152, RAA788155 and RAA788158) modes

The new RAA78815x transceivers are optimal solutions for high reliability systems. Renesas has designed multiple system architectures using complementary power, analog and microcontroller offerings to create complete solutions for a variety of applications, including the 48V position control solution and AC servo motor control with industrial network connections, among many others. Renesas’ winning combinations are approved solutions designed to help customers accelerate their designs and get to market faster. Renesas offers over 250 winning combinations that work together seamlessly for a wide range of applications and end products. They can be found at


The RAA78815x transceivers are now available in MSOP and SOIC packages with pin counts ranging from 8 to 14. An evaluation board for the new family of transceivers is also available. For more information, please visit

About Renesas Electronics Corporation

Renesas Electronics Corporation (IS: 6723) delivers reliable in-vehicle design innovation with comprehensive semiconductor solutions that enable billions of smart connected devices to improve the way people work and live. A global A leader in microcontrollers, analog, power and SoC products, Renesas provides complete solutions for a wide range of automotive, industrial, infrastructure and IoT applications that help shape a future without limits. Learn more about follow us on LinkedIn, Facebook, Twitter, Youtube and Instagram.

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