1. LTC2862MPS8-2TRPBF Substitution Conclusion The substitution of the SP481ECN-L/TR with the LTC2862MPS8-2TRPBF is conditional, and its viability depends entirely on the original system's required data rate. While the two devices are compatible in their basic functionality (half-duplex RS-485/422), pinout, and package, there are critical performance distinctions. First, the LTC2862's maximum data rate is only 250 kbps, which is significantly lower than the SP481's 10 Mbps. If the original system operates in a high-speed communication scenario requiring megabits per second, this substitution will result in communication failure or severe performance degradation. Second, the LTC2862 features a receiver hysteresis of 150mV, markedly superior to the SP481's 20mV. This indicates that the LTC2862 offers significantly enhanced noise immunity and stability in industrial environments with substantial noise or signal distortion. Finally, the LTC2862 supports a wider supply voltage range of 3V to 5.5V, compared to the SP481's single 5V system range of 4.75V to 5.25V, granting it broader application adaptability. In applications where the data rate requirement does not exceed 250 kbps, the LTC2862 presents a superior substitute, offering advantages in noise immunity and power supply flexibility. Conversely, for higher-speed requirements, it is not a viable replacement.