Original Part
Alternative Part
1. ADM1485JRZ-REEL Substitution Conclusion
From the perspective of core electrical parameters and package, the ADM1485JRZ-REEL is a viable direct substitute for the SN75LBC176DR. Both are 1/1 half-duplex RS-422/485 transceivers, sharing identical data rates (30 Mbps), supply voltage range (4.75V to 5.25V), and package (8-SOIC). The key difference lies in the receiver hysteresis voltage: the ADM1485JRZ specifies 70mV, which is higher than the original part's 50mV. This substitution effectively introduces a performance enhancement, as the higher hysteresis provides superior noise immunity and more stable signal recognition in bus environments prone to noise and signal jitter. Unless specific timing requirements dictate otherwise, this variance typically does not introduce compatibility issues and can improve overall system robustness.
2. ADM1485ARZ-REEL Substitution Conclusion
The feasibility of substituting the SN75LBC176DR with the ADM1485ARZ-REEL is identical to the conclusion for the JRZ variant above, representing a highly viable alternative. The ARZ part matches the original device and the JRZ variant in all critical specifications: protocol support, data rate, voltage range, and package. Like the JRZ, it features a 70mV receiver hysteresis voltage, offering the same enhanced noise immunity advantage over the original part's 50mV. While the "A" and "J" suffixes may denote different temperature grades or test specifications, their electrical characteristics are equivalent within the core parameter set examined here. Therefore, both can serve as direct drop-in replacements that deliver improved performance.
Analysis ID: B01F-D9EA000
Based on part parameters and for reference only. Not to be used for procurement or production.
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