Original Part
Alternative Part
1. SP1485EEN-L Substitution Conclusion
In the vast majority of application scenarios, the SP1485EEN-L can directly replace the ISL32485EIBZ. Both are half-duplex RS-422/485 transceivers with pin-to-pin compatibility and identical package outlines. Key differences are as follows: the SP1485EEN-L supports a higher data rate of up to 20 Mbps (versus 1 Mbps for the original part), has a slightly narrower supply voltage range (4.75 V to 5.25 V compared to 4.5 V to 5.5 V), and provides lower receiver hysteresis (20 mV versus 25 mV). The higher data rate enables faster communication, but signal integrity may require optimization in long-line or high-noise environments. The tighter supply range demands slightly better power supply accuracy, though typical 5 V systems generally meet this requirement. The difference in hysteresis has a negligible impact on noise immunity and usually does not affect standard applications. Provided system power stability meets the specification, substituting with the SP1485EEN-L offers additional bandwidth margin.
2. SP485EEN-L Substitution Conclusion
The SP485EEN-L is also a viable direct replacement for the ISL32485EIBZ. Key deviations from the original part include a data rate of 10 Mbps (higher than the original 1 Mbps), a supply voltage range of 4.75 V to 5.25 V (slightly narrower), and receiver hysteresis of 20 mV (somewhat lower). The increased data rate allows compatibility with higher-speed applications; however, as with the original part, actual implementation must match bus length and termination design. The supply voltage difference typically has no impact in stable 5 V systems. Reduced hysteresis may slightly diminish noise margin, but the device still meets RS-485 standard requirements in typical industrial environments. All performance parameters are equal or better after substitution, and a smooth replacement can be achieved with attention to power supply matching.
Analysis ID: C35F-0946000
Based on part parameters and for reference only. Not to be used for procurement or production.
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