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Description

The RAA788178 3V half-duplex powered RS-485/RS-422 transceiver features a high output drive and high EFT and ESD protection. The device is immune to ±3kV IEC 61000-4-4 EFT transients and can withstand up to ±16.5kV IEC 61000-4-2 ESD strikes without latch‑up.

The RAA78817x family includes half and full-duplex transceivers with active-high driver-enable pins and active-low receiver-enable pins. These transceivers support data rates of 250kbps, 500kbps, and 20Mbps with a performance that is characterized from -40 °C to +85 °C.

Features

  • IEC 61000 ESD protection on RS-485 I/O pins: ±16.5kV
  • Class 3 ESD level on all other pins: >7kV HBM
  • ±3kV EFT immunity of bus I/O pins
  • Full fail-safe (open, short, terminated/floating) receivers
  • Hot plug - Tx and Rx outputs remain three-state during power-up
  • True 1/8 unit load allows up to 256 devices on the bus
  • Single 3.3V supply
  • High data rates: up to 20Mbps
  • Low quiescent supply current: 800μA (Max)
  • Ultra-low shutdown supply current: 10nA
  • -7V to +12V common-mode input/output voltage range
  • Half and full duplex pinouts
  • Current limiting and thermal shutdown for driver overload protection
  • Tiny MSOP packages consume 50% less board space
  • Pb-free (RoHS compliant)

Comparison

 

Applications

 
  • Industrial networks in factory automation
  • Building automation: lighting, elevators, HVAC
  • Industrial process control networks
  • Security camera networks
  • Networks with a star topology
  • Long-haul networks in coal mines and oil rigs
  • High node-count networks
  • Automated utility e-meter reading systems
 

Models

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Diagram of ECAD Models
 
RAA78815x & RAA78817x Family of RS-485/422 Transceivers with Highest EFT Immunity

Overview of the key features, advantages and target applications for the RAA78817x family of 3.3V RS-485/422 transceivers with +/-3kV EFT immunity and the RAA78815x family of 5V RS-485/422 transceivers with +/-5KV EFT immunity.