Original Part
SDRAM - DDR Memory IC 128Mbit Parallel 200 MHz 700 ps 66-TSOP II
Alternative Part
1. W9412G6KH-5I Substitution Conclusion
From a core functional parameter perspective, the W9412G6KH-5I is a highly viable substitute. It matches the original part number exactly in capacity (128Mbit), organization (8Mx16), clock frequency (200MHz), voltage (2.3V-2.7V), and package (66-TSSOP), ensuring fundamental electrical and physical compatibility. There are two notable differences. First, the memory interface: the original part is labeled "Parallel," while the W9412G6KH-5I specifies "SSTL_2." This is actually the standard interface for DDR SDRAM; the two are compatible in terms of electrical standard and signal logic. However, it is necessary to verify that the host controller supports SSTL_2 I/O levels. Second, the access time: the original part specifies 700ps (likely referring to internal tAC), whereas the Winbond part specifies 50ns (typically referring to tRAS or tRC full-page timing). This discrepancy stems from different parameter description contexts, not a direct performance comparison. According to the DDR-200 specification (5ns clock period), both parts' key timings (e.g., CL, tRCD, tRP) should meet the specification requirements. Provided that motherboard signal level compatibility is confirmed and timing configuration adheres to the specification, this part can serve as a direct drop-in replacement.
2. W9412G6KH-5 Substitution Conclusion
The substitution feasibility for the W9412G6KH-5 is identical to that of the W9412G6KH-5I, with the critical addition of evaluating the operating temperature range. All its electrical parameters, package, and the technical differences noted above (SSTL_2 interface, 50ns access time marking) are consistent with the "-5I" version. The key distinction lies in the suffix: "-5" versus "-5I" typically indicates different operating temperature grades. The "-5I" most likely denotes an Industrial temperature range (e.g., -40°C to +85°C), while "-5" likely indicates a Commercial range only (e.g., 0°C to +70°C). If the original design or application environment has no special temperature requirements and operates within the Commercial range, then the W9412G6KH-5 is fully functionally equivalent for substitution. However, if the original application involves extended or industrial temperature environments, the "-5I" version must be selected, or the original part's temperature grade must be verified. Prior to substitution, the application's temperature requirements must be clearly defined, and it must be confirmed that the W9412G6KH-5's temperature specification adequately covers both the original part's rating and the actual operating conditions.
Analysis ID: 0E94-9EEB000
Based on part parameters and for reference only. Not to be used for procurement or production.
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