RS-485/RS-422 transceiver for 3.3V industrial buses
The Texas Instruments SN65HVD33DR is a full-duplex RS-485/RS-422 transceiver in a 14-SOIC package, with one driver and one receiver on a single 3V-to-3.6V supply rail. It pushes data at 23 Mbps, which puts it in the high-speed tier for RS-485 — short cable runs, but fast enough for multi-drop backplanes or encoder links that can't tolerate the turnaround delay of half-duplex. The 50 mV of receiver hysteresis cleans up noise on long stubs without external biasing.
The base product number 65HVD33 covers a family of pin-compatible options; if you ever need to dual-source or swap speed grades, the sibling parts share the same footprint and supply rail.
At 23 Mbps, the SN65HVD33DR is not a slow-twitch industrial link. Practical cable length at that speed is around 10 to 20 meters before signal attenuation and reflections eat the eye. If your run is under 50 feet and you need full-duplex throughput for real-time control or high-speed data logging, this part fits. The 3.3V supply also keeps the I/O compatible with modern MCUs and SoCs without level shifters — one less BOM line.
Full-duplex wiring saves the turnaround cycle
Full-duplex means separate pairs for transmit and receive — no driver-enable toggling, no dead time between send and receive. That matters in Modbus RTU or Profibus-style polling where every microsecond of bus turnaround adds up. The 1/1 driver/receiver count is the standard for point-to-point or multi-drop where each node talks and listens simultaneously.