Original Part
Alternative Part
1. SP3494CN-L/TR Substitution Conclusion
The SP3494CN-L/TR presents a potential drop-in replacement for the SN75HVD10D based on fundamental electrical compatibility. Both devices support the RS422/RS485 protocol, feature a 1/1 half-duplex architecture, operate from a 3V to 3.6V supply, and share the same 8-SOIC package, enabling physical pin compatibility.
Key performance deviations, however, must be considered. The SP3494CN-L/TR is limited to a data rate of 2.5 Mbps, significantly lower than the 32 Mbps capability of the SN75HVD10D. Furthermore, its receiver hysteresis is specified at 20 mV, compared to 35 mV for the SN75HVD10D.
Consequently, the SP3494CN-L/TR is only suitable for low-speed communication applications (e.g., data transmission ≤ 2.5 Mbps) and cannot meet high-speed requirements. The reduced hysteresis also diminishes noise immunity, which may lead to signal false triggering in environments with significant electromagnetic interference (EMI), potentially compromising system reliability. Substitution is not viable if the original design relies on high-speed operation or robust noise immunity. It may only be considered for applications with low data rate requirements and minimal ambient electrical noise.
2. SP3494EN-L/TR Substitution Conclusion
The feasibility of substituting the SN75HVD10D with the SP3494EN-L/TR is identical to that of the SP3494CN-L/TR, as both parts share identical specifications. They are compatible with RS422/RS485 standards, feature a 1/1 half-duplex configuration, operate from a 3V to 3.6V supply, and utilize the 8-SOIC package, ensuring both physical and electrical interface compatibility.
The critical differentiating parameters remain the same: data rate (2.5 Mbps for SP3494EN-L/TR vs. 32 Mbps for SN75HVD10D) and receiver hysteresis (20 mV vs. 35 mV). This indicates the SP3494EN-L/TR is confined to low-speed data links (≤ 2.5 Mbps) and is incapable of supporting high-speed communication. The lower hysteresis reduces noise margin, which can degrade signal integrity in noisy environments and increase the risk of bit errors.
Substitution feasibility is highly application-dependent. It may be acceptable if the system does not require high-speed operation and resides in a low-interference environment. Otherwise, due to the performance downgrade, the substitution is not recommended.
Analysis ID: D428-3DCB000
Based on part parameters and for reference only. Not to be used for procurement or production.
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