40 Mbps half-duplex transceiver for RS-485/RS-422 buses
The Texas Instruments SN65HVD05D is a half-duplex transceiver supporting both RS-485 and RS-422 protocols, with a single driver and single receiver (1/1). It is designed for high-speed serial communication over balanced twisted-pair cables, commonly used in industrial automation, motor drives, building management, and telecom infrastructure where noise immunity and long cable runs are required. The 40 Mbps data rate supports high-throughput links such as backplane interconnects or high-speed fieldbus segments, though the practical cable length at this speed is limited to a few meters due to signal attenuation. The 35 mV receiver hysteresis provides built-in noise rejection on long or noisy bus lines, reducing false triggering from reflections or coupled interference.
Housed in an 8-pin SOIC package (8-SOIC, 3.90 mm width), the SN65HVD05D uses a standard surface-mount footprint compatible with automated assembly.