Original Part
Alternative Part
1. ADM1485ARZ-REEL7 Substitution Conclusion
The ADM1485ARZ-REEL7 is a pin‑for‑pin match to the original SP1485EEN‑L/TR in package (8‑SOIC), protocol (RS422/RS485), duplex mode (half‑duplex), and driver/receiver count (1/1). Its supply voltage range is identical (4.75 V–5.25 V), allowing direct drop‑in replacement in 5 V systems. The differences lie in receiver hysteresis, which is 70 mV compared to the original 20 mV, providing higher noise margin and more robust signal integrity in noisy environments, and data rate, which is increased to 30 Mbps versus the original 20 Mbps, ensuring backward compatibility while supporting higher‑speed communication. Overall, this device is a viable direct substitute with potentially superior electrical performance. However, signal‑threshold compatibility should be validated in the actual application, as the hysteresis difference may slightly shift the receiver switching point.
2. ADM3485EARZ‑REEL7 Substitution Conclusion
The ADM3485EARZ‑REEL7 matches the original device in package, protocol, and duplex mode, but key differences make direct substitution inadvisable. Its supply voltage range is 3 V–3.6 V (original: 4.75 V–5.25 V), meaning it is designed for 3.3 V systems and is not compatible with the original 5 V supply; forced replacement could cause device damage or malfunction. Additionally, the data rate is reduced to 10 Mbps (original: 20 Mbps); if the original system operates at 20 Mbps, this device cannot meet the high‑speed communication requirement. While the receiver hysteresis of 50 mV (original: 20 mV) offers improved noise immunity, it does not compensate for the supply voltage and speed mismatch. Unless the system is redesigned for 3.3 V operation and reduced data‑rate requirements, this model is not suitable as a direct replacement.
Analysis ID: 97BE-0B9D000
Based on part parameters and for reference only. Not to be used for procurement or production.
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