Lifecycle reality — this is a Last Buy part
That means Texas Instruments has issued a final order window, after which this exact order code will no longer be manufactured. For existing BOM lines already using the SN75176AD, this is the time to secure lifetime-buy quantities or identify a drop-in replacement before the last shipment window closes.
Package and field-swap notes
This is an 8-SOIC surface-mount part (3.90 mm body width). No lab bench needed for a swap if you have a hot-air station and steady hands — the pin pitch is fine but the package is well marked. Pin 1 orientation is standard (dot or notch at the top-left when the part number reads left to right).
What the 50 mV hysteresis means on the bus
The 50 mV of receiver hysteresis is the spec that determines how cleanly the part rejects noise on a long RS485 stub. On a 100 m cable run with marginal termination, that hysteresis prevents the receiver from chattering on reflections. If your bus is running at 250 kbps or below over twisted pair in a noisy electrical cabinet, this part handles it. At higher data rates or with poor grounding, you might need a part with wider hysteresis or a failsafe bias — but for the classic industrial RS485 point-to-point or multi-drop, 50 mV is the standard sweet spot.