Original Part
Alternative Part
1. ADM3485EARZ-REEL Substitution Conclusion
The ADM3485EARZ-REEL is not a suitable drop-in replacement for the SP1485ECN-L/TR, primarily due to supply voltage and data rate incompatibility. The core differences lie in its operating voltage range of 3.0V–3.6V (compared to 5V for the original part), which would require a power system redesign and could introduce level-matching risks if substituted directly. Additionally, its maximum data rate is limited to 10 Mbps (versus 20 Mbps for the original). If the existing system operates at higher speeds, this device will not meet the bandwidth requirements. However, its receiver hysteresis of 50 mV (compared to 20 mV originally) offers superior noise immunity, making it better suited for lower-speed 3.3V applications in noisy environments.
2. ADM1485ARZ-REEL Substitution Conclusion
The ADM1485ARZ-REEL offers a high degree of drop-in replacement feasibility, with improved performance and noise immunity. Key parameters are well aligned: both operate from a 5V supply (4.75V–5.25V) and share the same package footprint, allowing direct substitution without power supply modifications. The main improvements are a higher data rate (30 Mbps versus 20 Mbps), providing greater communication margin and enhanced system response potential, along with significantly increased receiver hysteresis of 70 mV (compared to 20 mV originally). This substantially improves noise rejection and signal integrity, making it suitable for electrically noisy environments or long-line transmission applications. Note, however, that increased hysteresis may slightly raise signal detection latency.
Analysis ID: 03D1-B54B000
Based on part parameters and for reference only. Not to be used for procurement or production.
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