Original Part
Alternative Part
1. ADM1485JRZ-REEL Substitution Conclusion
The ADM1485JRZ-REEL can serve as a direct replacement for the ST485EBDR with superior performance. Both devices are fully compatible in core interface parameters—half-duplex, 1/1 architecture, identical supply voltage, and package. The key distinction lies in the data rate: the ADM1485 supports up to 30 Mbps, significantly higher than the original part’s 5 Mbps. After substitution, the communication link gains substantial theoretical bandwidth margin, enabling potential support for higher‑speed communication. However, it should be noted that higher data rates are more sensitive to signal integrity issues—such as PCB routing, impedance matching, and termination. In a system originally designed for 5 Mbps, longer traces or suboptimal layout may make the link more susceptible to reflections and noise. Therefore, the actual application environment should be evaluated before implementation.
2. ISL8485ECBZ Substitution Conclusion
The ISL8485ECBZ is a direct drop‑in replacement for the ST485EBDR and offers improved power supply adaptability. The two devices are fully matched in functional logic, package, and basic communication parameters. Two differences exist: first, the ISL8485 supports a data rate of 10 Mbps, twice that of the original part, providing moderate performance headroom for the system; second, its supply voltage range is wider (4.5 V to 5.5 V) compared to the original’s 4.75 V to 5.25 V. This gives the ISL8485 higher tolerance to supply fluctuations and ripple, delivering greater robustness and reliability in applications with less‑ideal power conditions. The substitution risk is very low.
Analysis ID: E342-3129000
Based on part parameters and for reference only. Not to be used for procurement or production.
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