5V RS-485/422 Transceiver Family With High EFT Immunity

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New differential transceivers deliver ±5000V EFT immunity and up to ±16,000V ESD immunity for industrial and automation applications

With the introduction of the RAA78815x Family of 5V differential RS-485/422 transceivers, Renesas Electronics Corporation now delivers industry-leading electrical fast transient (EFT) immunity ±5000V and ESD protection up to ±16,000V. These products are the ideal solution for noise-sensitive industrial communication networks such as industrial networks, process control networks, building automation, long-haul network and security camera network applications.   

The six new full and half-duplex ruggedised devices meet both the RS-485 and RS-422 communication standards. They are built on Renesas’ current ISL315x 5V RS-485 transceiver family with additional immunity for EFT. In addition to the industry’s highest EFT immunity, the RAA78815x family delivers exceptional differential output voltages, featuring 3.1V into the RS-485-required 54Ω load.

The new high-speed transceivers also feature bus leakage currents of a maximum 125 μA, representing a true 1/8 unit load to the RS-485 bus. Developers can connect up to 512 transceivers on the same bus without using repeaters and without compromising the RS-485 network standard’s 32-unit load maximum. As a result of these changes, the RAA78815x family can lower implementation and downtime costs, since a single network can support more nodes with a lower likelihood of communications issues due to ESD and EFT overvoltage transients.

“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 from the system,” said Bobby Matinpour, Vice President of the Standard Products Business Division at Renesas. “Featuring superior EFT immunity, output drive, and supply current levels, the RAA78815x family builds on 50 years’ experience in RS-485/422 transceiver design to deliver robust solutions for industrial and factory automation.”

Key Features of the RAA78815x Family

  • ±5000V EFT immunity
  • ±16,000V ESD immunity
  • 3.1V (typ) into Rd = 54Ω
  • Low 125 μA bus current, 550 μA supply current, and 70nA shutdown current
  • Ultra-small 3×5 mm MSOP and 6 x 8.6 mm SOIC package
  • Support for multiple data rates and both full (RAA788150, RAA788153, and RAA788156) and half (RAA788152, RAA788155, and RAA788158) duplex modes

The new RAA78815x transceivers are optimal solutions for high-reliability systems. Renesas has designed multiple system architectures using complementary power, analogue and microcontroller offerings to create comprehensive solutions for a variety of applications, including the 48V Position Control Solution and AC Servo Motor Control with Industrial Network Connections, among many others. 

The RAA78815x transceivers are available now in MSOP and SOIC packages with pin counts ranging from 8 to 14. An evaluation board for the new transceiver family is also available.


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