Original Part
Alternative Part
1. SP3494CN-L Substitution Conclusion
Direct substitution is not recommended. The SP3494CN-L exhibits two critical technical deviations from the original part, ISL3158EIBZ-T, that preclude direct compatibility. First is the supply voltage: the SP3494CN-L operates from 3.0V to 3.6V, whereas the original part is designed for a 5V system (4.5V-5.5V). A direct swap would prevent proper operation or risk damaging the device. Second is the data rate: the SP3494CN-L supports a maximum of 2.5Mbps, significantly lower than the original part's 20Mbps capability. In high-speed communication applications, this substitution would fail to maintain the required transmission bandwidth, likely resulting in communication failure. While both devices share identical functionality (half-duplex, 1 driver/1 receiver), protocol (RS-485/422), and package (8-SOIC), the mismatch in core electrical parameters renders direct substitution unfeasible. Forcing a replacement would necessitate a redesign of the system power supply and a thorough evaluation of whether the reduced data rate meets application requirements.
2. SP3494CN-L/TR Substitution Conclusion
The conclusion is identical to that for the SP3494CN-L: direct substitution is not advised. The SP3494CN-L/TR and the SP3494CN-L are the same die in different packaging formats (the "/TR" suffix typically denotes tape-and-reel packaging). Their electrical parameters are therefore exactly the same, namely a 3.0V-3.6V operating voltage and a maximum data rate of 2.5Mbps. Consequently, it faces the same fundamental incompatibilities with the original 5V, 20Mbps ISL3158EIBZ-T regarding supply voltage and data rate. A direct replacement is not possible without modifying the system design, such as adding voltage level translation or reducing the communication baud rate. Package compatibility offers only a physical convenience; the mismatch in electrical characteristics remains the primary barrier to substitution.
Analysis ID: 2304-3F8A000
Based on part parameters and for reference only. Not to be used for procurement or production.
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