Original Part
Alternative Part
1. ADM1485ARZ-REEL7 Substitution Conclusion
From the perspective of functionality, package, and basic electrical parameters, the ADM1485ARZ-REEL7 can serve as a substitute for the ST485ERBDR. The key difference lies in its significantly higher data rate (30 Mbps versus 2.5 Mbps). The ADM1485 offers enhanced physical layer communication capability, is fully backward compatible with the original part's low-speed applications, and typically provides superior signal edge quality and greater noise immunity margin. However, when operating at very high speeds, the PCB layout, cable length, and termination matching must be re-evaluated to ensure signal integrity. If the original design was optimized for low speed, direct substitution will generally result in more ample and reliable system performance.
2. ISL8485ECBZ Substitution Conclusion
The ISL8485ECBZ is also a viable substitute for the ST485ERBDR. The primary differences are a higher data rate (10 Mbps vs. 2.5 Mbps) and a wider supply voltage range (4.5V to 5.5V vs. 4.75V to 5.25V). The ISL8485 not only maintains compatibility and extends the communication speed potential of the original system, but its more relaxed voltage requirement also improves the system's tolerance to supply fluctuations or noise. This may lead to more stable performance in applications with marginal power supply conditions. Following direct substitution, the device will operate without issue in the original low-speed application, while overall system robustness is improved.
Analysis ID: 98F1-3358000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com