Original Part
Alternative Part
1. ST485ERBDR Substitution Conclusion
Direct substitution is not recommended. Although the package is identical and it is a similar half-duplex transceiver, the ST485ERBDR exhibits significant deficiencies in key parameters: its data rate is only 2.5 Mbps, far below the original part's 20 Mbps, rendering it unsuitable for high-speed communication scenarios; its supply voltage range is narrower (4.75V–5.25V), offering poorer power supply tolerance; furthermore, its receiver hysteresis (70 mV) is lower than the original's (100 mV), resulting in weaker noise immunity. These discrepancies would directly lead to potential communication failures or reduced reliability in the original design if operated at high speeds or in electrically harsh environments.
2. SN65HVD3088ED Substitution Conclusion
Substitution can be considered with caution in applications with benign electrical environments, but noise immunity risks must be evaluated. This model matches the original part in core specifications (20 Mbps data rate, 4.5V–5.5V supply range), and the package is identical, ensuring basic functionality and power supply compatibility. The primary difference is its receiver hysteresis of only 30 mV, which is significantly lower than the original's 100 mV. This reduces the receiver's noise margin for input signals, increasing the risk of false triggering and data errors in applications with substantial common-mode noise or signal ringing. Prior to replacement, it is essential to verify that the noise level in the actual application environment is sufficiently low.
Analysis ID: 3693-EFD7000
Based on part parameters and for reference only. Not to be used for procurement or production.
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