Original Part
Alternative Part
1. SN65HVD08DR Substitution Conclusion
From a core functionality and package perspective, the SN65HVD08DR can serve as a direct replacement for the SN75HVD08D. Both are half-duplex RS-422/485 transceivers manufactured by TI, featuring an identical 1/1 driver/receiver configuration, 35 mV receiver hysteresis, and a wide 3V to 5.5V supply voltage range. They also utilize the compatible 8-SOIC package. The key distinction is that the SN65HVD08DR does not have a specified nominal data rate, whereas the SN75HVD08D supports 10 Mbps. For high-speed communication applications operating near 10 Mbps, careful validation of the SN65HVD08DR's actual performance is necessary. However, for medium-to-low speed applications, it can be considered a pin-compatible, functionally equivalent substitute with highly consistent electrical parameters.
2. SP3078EEN-L Substitution Conclusion
The SP3078EEN-L is a potential functional replacement for the SN75HVD08D, as it is also a half-duplex RS-422/485 transceiver with a compatible package. Two significant technical differences exist: First, its supply voltage is limited to 3.3V (compared to the SN75HVD08D's 3V to 5.5V range), preventing its direct use in 5V systems or applications requiring a wide voltage range. Second, its receiver hysteresis is only 15 mV (versus 35 mV for the SN75HVD08D), which may result in weaker noise immunity. However, its increased data rate of 16 Mbps supports higher-speed communication. The feasibility of substitution is highly application-dependent. It may be suitable for systems operating at 3.3V with a low-noise environment. It is not recommended for applications requiring wide-voltage supply or robust noise rejection capability.
Analysis ID: 111D-98D2000
Based on part parameters and for reference only. Not to be used for procurement or production.
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