ST485EBDR

Product Overview

The ST485EBDR from STMicroelectronics is a surface-mount transceiver intended for RS422 and RS485 serial communication links. It combines one driver and one receiver in an 8-SOIC package and operates from a 4.75 V to 5.25 V supply. The device supports half-duplex operation and a 5 Mbps data rate, with 70 mV receiver hysteresis. Its specified operating temperature range is -40°C to 85°C.

Key Features

• RS422 and RS485 protocol support
• 1 driver and 1 receiver
• Half-duplex transceiver operation
• 5 Mbps data rate
• 70 mV receiver hysteresis
• 4.75 V to 5.25 V supply voltage
• -40°C to 85°C operating temperature range
• Surface-mount 8-SOIC package (0.154 inch, 3.90 mm width)

Applications

• Embedded systems requiring RS422 or RS485 serial communication.
• Half-duplex serial links using a single driver and a single receiver.
• Surface-mount interface boards operating from a 4.75 V to 5.25 V supply.

Design & Procurement Notes

When selecting the ST485EBDR, confirm that the system supply stays within 4.75 V to 5.25 V and that the PCB can accommodate the surface-mount 8-SOIC footprint. Because the device is a 1/1 half-duplex transceiver, the link architecture should account for shared transmit and receive timing rather than simultaneous full-duplex operation. Verify that the required link speed is at or below 5 Mbps and that the 70 mV receiver hysteresis is appropriate for the expected signal quality. The -40°C to 85°C operating range should also be checked against the actual ambient conditions of the end product.