1. ADM487EWARZ Substitution Conclusion Direct substitution is not viable. The ADM487EWARZ suffers from an order-of-magnitude deficiency in data rate (250kbps vs. 15Mbps), rendering it wholly incapable of meeting the original design's requirement for high-speed communication. Forcing a replacement would result in communication failure or severe performance degradation. Furthermore, its narrower supply voltage range (4.75V–5.25V vs. 4.5V–5.5V) imposes stricter demands on system power supply stability. While its higher receiver hysteresis (70mV vs. 25mV) enhances noise immunity, it may alter the signal trigger threshold, introducing uncertainty in marginal scenarios with poor signal integrity. Although its "Automotive Grade" certification offers higher reliability, the mismatch in core performance specifications remains the decisive disqualifying factor.