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Renesas Launches 5V RS-485/422 Transceiver Family

Renesas Electronics has unveiled the RAA78815x Transceiver Family of 5V differential RS-485/422 transceivers with industry-leading electrical fast transient (EFT) immunity ±5000V and ESD protection up to ±16,000V, making these products the ideal solution for noise-sensitive industrial communication networks.

Renesas The six new full and half-duplex ruggedized devices meet both the RS-485 and RS-422 communication standards and are ideally suited for a variety of industrial networks, process control networks, building automation, long-haul network, and security camera network applications.

“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.”

The new devices build 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.

Key Features of the RAA78815x Family

  • ±5000V EFT immunity
  • ±16,000V ESD immunity
  • 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


Aishwarya Saxena

A book geek, with creative mind, an electronics degree, and zealous for writing.Creativity is the one thing in her opinion which drove her to enter into editing field. Allured towards south Indian cuisine and culture, love to discover new cultures and their customs. Relishes in discovering new music genres.

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