1. ADM1485ARZ-REEL Substitution Conclusion The ADM1485ARZ-REEL can serve as a drop-in replacement for the SN65LBC176QD, as both devices are functionally compatible in terms of protocol (RS422/RS485), driver/receiver count (1/1), duplex mode (half-duplex), supply voltage range (4.75V to 5.25V), and package (8-SOIC). The key differences lie in the receiver hysteresis, which is increased from 50 mV in the original device to 70 mV in the substitute. This higher hysteresis provides improved noise immunity in electrically noisy environments, as a larger signal swing is required to trigger a state transition, thereby reducing false triggering. Additionally, the substitute explicitly supports a data rate of 30 Mbps, whereas the original part does not specify a maximum rate. If the original application operates at a lower data rate (e.g., around 10 Mbps), the replacement part offers superior high-speed performance and can support faster data transmission. Overall, the substitution is feasible; however, it is recommended to verify the actual data rate requirements and noise conditions in the target application to ensure seamless compatibility.