30 Mbps driver for RS422/RS485 buses
The SN65LBC174AMDWREP is a quad differential line driver from Texas Instruments, designed for RS422 and RS485 communication. It delivers a 30 Mbps data rate — enough for high-speed industrial backplanes, motor drive feedback links, and avionics data buses. With four drivers and no receivers, this IC handles the transmit side of a multipoint bus. You will need a separate RS485 receiver per node to complete the transceiver pair.
Military temperature grade and supply range
The commercial-grade SN65LBC174A tops out at 85°C, so the 'MDWREP' suffix buys you 40°C more headroom on the hot end. Supply voltage is 4.75V to 5.25V, a tight 5V rail that demands a clean power supply — expect to decouple with a 0.1 µF ceramic near each VCC pin.
Active production — sourcing and package
The part ships in Tape & Reel (TR) or Cut Tape (CT) options, 20-SOIC wide-body (0.295-inch, 7.50 mm width) — a standard footprint that runs on most pick-and-place lines. ROHS3 compliant. No lead or halogen restrictions beyond the current EU directive.
Noise margin with 40 mV hysteresis
The receiver hysteresis is 40 mV typical, which means the input threshold has a built-in deadband that rejects small noise glitches on long cable runs. On a 1000-meter RS485 stub at 30 Mbps, this hysteresis keeps the output from chattering on common-mode noise from nearby VFDs.