ST485BDR

Product Overview

The ST485BDR from STMicroelectronics is a half-duplex RS422/RS485 transceiver in an 8-SOIC surface-mount package. It provides one driver and one receiver for serial data links operating at up to 2.5 Mbps and powered from a 4.75 V to 5.25 V supply. The specified operating temperature range is -40°C to 85°C, and the receiver includes 70 mV hysteresis.

Key Features

• Half-duplex RS422 and RS485 transceiver with 1 driver and 1 receiver.
• Supports serial data transmission at a data rate of 2.5 Mbps.
• Operates from a 4.75 V to 5.25 V supply.
• Includes 70 mV receiver hysteresis.
• Specified operating temperature range: -40°C to 85°C.
• 8-SOIC surface-mount package (0.154 in, 3.90 mm width).

Applications

• Serial communication links between embedded controllers and peripheral modules.
• Half-duplex data buses for distributed sensor or actuator networks.
• Point-to-point serial links using RS422/RS485 electrical standards.

Design & Procurement Notes

When selecting ST485BDR, verify that the system power rail remains within 4.75 V to 5.25 V and that the board layout supports an 8-SOIC surface-mount footprint. The half-duplex 1/1 architecture requires direction control in the serial link design, and the 2.5 Mbps data-rate specification should be checked against the target baud rate. The 70 mV receiver hysteresis and -40°C to 85°C operating range are relevant for noise margin and environmental review. Designers should account for the single-driver, single-receiver channel count when planning link topology. Procurement should confirm package dimensions and supply voltage compatibility rather than assuming higher supply voltage or full-duplex operation.