The SN75976A1MDGGREP is a half-duplex transceiver from Texas Instruments that handles both RS422 and RS485 protocols, packing 9 drivers and 9 receivers into a single 56-TSSOP package. It operates from a 4.75 V to 5.25 V supply rail and includes 45 mV of receiver hysteresis for noise immunity on long bus runs.
With 9 drivers and 9 receivers, this transceiver can serve a multi-drop RS-485 network with up to 9 nodes, or handle bidirectional RS-422 links across 9 separate channels — reducing component count compared to using individual transceivers per channel. The 45 mV receiver hysteresis filters out noise on the differential bus, which is critical when running cables through electrically noisy industrial or automotive environments. The 56-TSSOP package (0.240-inch body width, 6.10 mm) is a surface-mount footprint that requires a 4-layer PCB for proper fan-out of the 56 pins — plan your board stack-up accordingly.