Original Part
Alternative Part
1. MAX487CSA+ Substitution Conclusion
The MAX487CSA+ is functionally and mechanically compatible as a drop-in replacement, but exhibits significant parametric deviations. Its data rate is reduced from 10 Mbps to 250 kbps, rendering it unsuitable for the original high-speed communication requirement. The supply voltage range is narrowed to 4.75V–5.25V, imposing stricter tolerance on the power supply and potentially compromising stability under voltage fluctuation. Although its receiver hysteresis (70 mV) matches the original part, its low-speed characteristic restricts its use to rate-insensitive, low-frequency applications such as industrial control or low-speed instrumentation. Direct substitution is not viable if the original system operates at 10 Mbps.
2. LT1785AIS8TRPBF Substitution Conclusion
The LT1785AIS8TRPBF meets package and protocol compatibility for substitution, but carries two key limitations. Its data rate is likewise capped at 250 kbps, unable to support the original 10 Mbps high-speed transmission. The receiver hysteresis is only 20 mV, substantially lower than the original 70 mV, resulting in significantly degraded noise immunity in noisy environments and potential false triggering due to signal jitter. Its supply voltage range (4.75V–5.25V) is also slightly narrower than the original part. This substitute is only suitable for low-noise, low-speed scenarios; replacement is not feasible if the original design relies on high hysteresis or high data rates.
Analysis ID: 940B-37BC000
Based on part parameters and for reference only. Not to be used for procurement or production.
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