ST485ABDR

Product Overview

ST485ABDR from STMicroelectronics is a surface-mount interface transceiver for RS422 and RS485 links. The device provides one driver and one receiver in a half-duplex arrangement and supports a data rate of 50 Mbps. It operates from a 4.5 V to 5.5 V supply and is specified for an operating temperature range of -40°C to 85°C. The transceiver is packaged in an 8-SOIC package, 0.154 in (3.90 mm) wide, for surface-mount assembly.

Key Features

• RS422 and RS485 transceiver with one driver and one receiver
• Half-duplex 1/1 transceiver configuration
• 50 Mbps data rate
• 70 mV receiver hysteresis
• 4.5 V to 5.5 V supply voltage range
• -40°C to 85°C operating temperature range
• 8-SOIC surface-mount package, 0.154 in (3.90 mm) width

Applications

• Point-to-point RS422 links between controllers and peripheral equipment
• Half-duplex RS485 communication links in equipment interconnects
• Surface-mount serial data links using the 50 Mbps transceiver

Design & Procurement Notes

Design considerations include matching the 4.5 V to 5.5 V supply to the board power rail and confirming that the 8-SOIC surface-mount footprint fits the PCB assembly process. The 1/1 half-duplex configuration should be considered when planning link direction behavior. The 50 Mbps data rate and 70 mV receiver hysteresis can be evaluated against the intended signal quality and input threshold margins. The -40°C to 85°C operating range should be considered for ambient placement and thermal layout. RS422 and RS485 protocol support should be aligned with the physical layer requirements of the selected network topology.