The Texas Instruments SN65HVD11DG4 is a half-duplex RS-422/RS-485 transceiver in an 8-SOIC package, rated for 10 Mbps on the bus.
This part is officially in Last Buy status. That means TI has issued a last-time-buy window, after which no further factory orders will be accepted. If this transceiver is on your active BOM, the decision is immediate: place a lifetime buy to cover remaining production, or qualify a pin-compatible replacement before the LTB closes. The 8-SOIC footprint is shared across many RS-485 transceivers, so a swap is feasible — but the qualification work needs to start now, not when stock runs dry.
Supply rail and bus margin
At 10 Mbps, the half-duplex bus needs proper termination (typically 120 Ω at each end) and stub lengths kept short to avoid reflections. The 35 mV hysteresis helps reject common-mode noise on the differential pair, which matters when the cable runs through a noisy industrial environment.