Renesas Introduces 5V RS-485/422 Transceiver Family With Industry's Highest EFT Immunity

New RS-485/422 Differential Transceivers Deliver ±5000 V EFT Immunity and up to ±16,000 V ESD Immunity for Industrial and Automation Applications

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

The new devices build on Renesas’ current ISL315x 5 V 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 3.1 V into the RS-485-required 54 Ω load. The new high-speed transceivers also feature bus leakage currents of 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 lower likelihood of communications issues due to ESD and EFT overvoltage transients.

Typical Driver Output Performance of RAA78815xE Transceivers.

Key Features of the RAA78815x Family

• ±5000 V EFT immunity
• ±16,000 V ESD immunity
• 3.1 V (typ) into R_D = 54 Ω
• Low 125 μA bus current, 550 μA supply current, and 70 nA shutdown current
• Ultra-small 3 × 5 mm MSOP and 6 × 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

Availability

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

RTKA788152DE0000BU –  5 V Half-Duplex RS-485 Transceivers Evaluation Board.