1. SN65LBC179AD Substitution Conclusion This device can serve as a high-performance direct replacement in the vast majority of applications. However, it should be noted that its robustness in noisy environments may be slightly lower. The part is fully compatible with the original model in core functionality (full-duplex RS-422/485, 1 driver/1 receiver), supply voltage (4.75V to 5.25V), and package (8-SOIC). The key differences are its significantly higher data rate (30 Mbps versus the original 250 kbps) and its lower receiver hysteresis (50 mV versus the original 70 mV). The higher data rate enables faster communication speeds but also imposes stricter requirements on PCB layout, cable length, and termination matching. If the system design is not properly executed, this high-speed capability can introduce signal integrity issues. The lower receiver hysteresis reduces the noise margin (noise immunity) for the input signal. In industrial environments with significant electrical noise, this may slightly increase the risk of bit errors.