Original Part
Alternative Part
SDRAM - DDR Memory IC 128Mbit Parallel 200 MHz 700 ps 66-TSOP II
SDRAM - DDR Memory IC 128Mbit Parallel 200 MHz 700 ps 66-TSOP II
1. Substitution Conclusion for IS43R16800E-5TLI-TR
Based on core electrical specifications, functionality, and package, the IS43R16800E-5TLI-TR is a fully compatible drop-in replacement for the original W9412G6KH-5. Both devices are 128Mbit (8Mx16) DDR SDRAMs operating at 200MHz clock frequency, housed in the same 66-pin TSSOP package. Key parameters such as power supply voltage (2.3V to 2.7V) and critical timings (e.g., 15ns write cycle time) are identical. Observed differences are primarily in parametric notation: the ISSI part specifies an "Access Time" of 700ps, which appears significantly better than the original's 50ns. In reality, this is a more precise and industry-standard specification for the tAC (Clock-to-Output Delay) parameter, aligning with DDR-400 standards, indicating equivalent or superior performance. Furthermore, the "Memory Interface" is listed as "Parallel" versus the original's "SSTL_2." This is a terminology distinction only, as the physical interface standard for DDR SDRAM is SSTL_2, making them electrically identical. The additional "I" suffix typically denotes an industrial temperature grade. If the original application requires an extended temperature range, this variant is the preferable choice.
2. Substitution Conclusion for IS43R16800E-5TL-TR
The IS43R16800E-5TL-TR also presents a highly viable direct replacement for the original W9412G6KH-5. It matches the original part in all critical hard parameters: memory density, organization, speed grade (200MHz), operating voltage, and package footprint. Similar to the TLI variant discussed above, the discrepancies lie in the "Access Time" parameter (700ps vs. 50ns) and the "Memory Interface" description (Parallel vs. SSTL_2). These are variations in manufacturer datasheet conventions or measurement references and do not constitute electrical or functional incompatibility, resulting in equivalent performance in practical application. The sole distinction between this part and the TLI variant is typically the temperature range (the "-TL" suffix likely indicates a commercial temperature grade). For original designs targeting commercial or consumer products without requiring industrial temperature specifications, this part is an equally valid substitute.
Analysis ID: DD81-CB3C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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