Original Part
Alternative Part
SDRAM - DDR Memory IC 128Mbit Parallel 167 MHz 700 ps 66-TSOP
SDRAM - DDR Memory IC 128Mbit Parallel 200 MHz 700 ps 66-TSOP II
1. MT46V8M16P-6T L:D TR Substitution Conclusion
Direct substitution is generally not feasible. The key discrepancy lies in its clock frequency of only 167 MHz, which is significantly lower than the original part's 200 MHz. This part offers lower maximum data bandwidth (throughput). On a bus requiring a 200 MHz clock rate, direct replacement may lead to degraded system performance or failure to meet timing requirements, unless the system design inherently provides sufficient derating margin for operating frequency. Although its access time (700 ps) appears superior on paper compared to the original's 50 ns, in a synchronous DRAM interface, clock frequency fundamentally determines the data transfer rate. This performance downgrade is the critical limitation.
2. IS43R16800E-5TLI-TR Substitution Conclusion
Direct substitution is viable and represents a preferable alternative. This part is fully compatible with the original part in all critical mechanical and electrical parameters, including memory density, organization, voltage, and package. It also supports the same 200 MHz clock frequency, ensuring equivalent system bandwidth performance. The difference is its specified access time of 700 ps, which is considerably faster than the original's 50 ns. While this suggests theoretically quicker response, it is important to note that in standard DDR SDRAM synchronous operation, actual performance is primarily governed by clock frequency and predefined latencies (CL values). This parameter difference may not yield a noticeable impact in practical applications, but it will not introduce any compatibility issues. The substitute part satisfies all requirements for functionality, performance, and physical compatibility.
Analysis ID: 70FA-4C5A000
Based on part parameters and for reference only. Not to be used for procurement or production.
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