Original Part
Alternative Part
1. LTC2857IMS8-1PBF Substitution Conclusion
Direct substitution of the LTC2857IMS8-1PBF is not feasible. While its data rate and package match the original part, two critical differences preclude a drop-in replacement. First, the supply voltage is incompatible: the original part is designed for a 3.3V system (3V–3.6V), whereas the LTC part operates from a 5V supply (4.5V–5.5V). Direct substitution would result in non-operation or potential damage. Second, the duplex mode differs: the original device is half-duplex, while the LTC device is full-duplex. This difference alters the pin functions and control logic, necessitating a redesign of the communication interface circuitry. Substitution is only possible if the system power supply and communication architecture are modified accordingly.
2. ADM3078EARZ Substitution Conclusion
The ADM3078EARZ is generally viable from an electrical parameter standpoint, but performance and package differences require attention. It shares the core requirements for substitution: a 3.3V supply and half-duplex operation. The key variances are as follows: its maximum data rate is slightly lower (16 Mbps vs. 20 Mbps). This is acceptable if the application's actual communication speed is below 16 Mbps; otherwise, errors may occur. Its receiver hysteresis (100 mV) is significantly higher than the original's (15 mV), providing markedly superior noise immunity in harsh industrial environments—a beneficial characteristic. The package is a wider 8-SOIC, not the original 8-MSOP. Before substitution, it is essential to verify sufficient PCB footprint space and pin solder compatibility.
Analysis ID: 2283-A7E8000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com