ST485ECDR

Product Overview

The ST485ECDR from STMicroelectronics is a half-duplex RS422 and RS485 transceiver intended for differential serial communication links. The device provides one driver and one receiver in an 8-SOIC surface-mount package with a 3.90 mm body width. It operates from a 4.75 V to 5.25 V supply and supports a 5 Mbps data rate. The receive path has 70 mV receiver hysteresis, and the rated operating temperature range is 0°C to 70°C. These characteristics define the basic electrical and mechanical envelope for board-level integration.

Key Features

• Half-duplex RS422 and RS485 transceiver
• One driver and one receiver per device
• 5 Mbps data rate
• 70 mV receiver hysteresis
• 4.75 V to 5.25 V supply voltage range
• 0°C to 70°C operating temperature range
• 8-SOIC surface-mount package, 0.154 in by 3.90 mm width

Applications

• Differential serial communication nodes on half-duplex RS485 or RS422 buses
• Interface between serial devices and differential cable pairs
• Serial data links using RS422 or RS485 signalling within a 5 Mbps rate
• Embedded equipment communication paths requiring a 1/1 transceiver

Design & Procurement Notes

When using the ST485ECDR, confirm that the board supply remains within 4.75 V to 5.25 V and that the selected PCB land pattern matches the 8-SOIC surface-mount footprint. The half-duplex 1/1 configuration provides one driver and one receiver, so transmit and receive activity should be managed within a single bus direction at a time. The 5 Mbps data rate, 70 mV receiver hysteresis, and 0°C to 70°C operating range should be considered together with cable length, termination, and ambient conditions to ensure the final link remains within the device's operating envelope.