5V RS-422/485 transceiver — supply voltage and protocol fit
The DS8921AMX: The 1/1 driver/receiver count means it handles one differential pair in each direction — the typical configuration for a point-to-point or multi-drop RS-485 node where the bus master transmits on one pair and listens on another. The 70 mV receiver hysteresis provides noise immunity on long cable runs where ground potential differences and reflections eat into the signal margin. For a 5 V differential bus, that hysteresis represents about 1.4 % of the signal swing — enough to suppress chatter from slow edges without requiring external filtering.
Temperature grade and board integration
The 8-SOIC package (3.90 mm body width) matches the standard SOIC-8 footprint — no pad pitch surprises for a layout already using that land pattern. Surface-mount assembly with the 8-SOIC package means standard reflow profiles apply; the 0.154-inch (3.90 mm) body width is the narrow SOIC variant, so the pad spacing is 1.27 mm. No special handling beyond normal MSL precautions for a commercial-grade logic part.
Note the RoHS non-compliant flag on this part. If your assembly requires RoHS-10/10 exemption-free compliance, confirm the date-code lot or consider the lead-free variant of this family. The non-compliant status means the original tin-lead finish is still available for legacy rework or mil-spec builds that explicitly allow it.