The ADM3483ARZ-REEL7 is a 3.3V RS-485/RS-422 transceiver from Analog Devices in SOIC-8, supporting data rates up to 250kbps. It is the low-speed version of the ADM3485 (20Mbps), optimized for long-distance, noise-immune communication where speed is not critical. The half-duplex design shares the A and B pins between driver and receiver, controlled by DE and RE. The driver output differential voltage is 1.5V minimum into a 54-ohm load (standard RS-485), and the receiver input sensitivity is +/-200mV. The receiver fail-safe ensures RO is HIGH when the bus is idle (open or terminated but not driven), preventing the UART from receiving false start bits. The receiver input impedance is 1/4 unit load (96k-ohm), allowing up to 128 devices on the bus. The common-mode range is -7V to +12V, handling ground potential differences between nodes. The driver propagation delay is 200ns at 250kbps. The device provides +/-4kV HBM ESD protection on the bus pins. The supply current is 1.2mA active and 10nA in shutdown (DE=LOW, RE=HIGH). The low-speed (250kbps) version provides slower edge rates (slew-rate limited) that reduce EMI and reflections on long, improperly terminated cables, making it suitable for cable lengths up to 4000 feet (1200m). The -ARZ-REEL7 suffix specifies SOIC-8, tape-and-reel (2500 pcs). Applications include: building automation (BACnet MS/TP), industrial sensors, and long-cable RS-485 networks.