Original Part
SDRAM - DDR Memory IC 128Mbit Parallel 166 MHz 700 ps 66-TSOP II
Alternative Part
1. W9412G6KH-5I Substitution Conclusion
The W9412G6KH-5I can serve as a direct replacement for the IS43R16800E-6TL in terms of core functionality and physical compatibility. Both devices share identical specifications for density (128Mbit), organization (8Mx16), operating voltage (2.3V-2.7V), and package (66-TSSOP). The primary difference lies in the interface description: the Winbond part explicitly specifies the SSTL_2 interface (the standard Stub Series Terminated Logic interface for DDR), while the ISSI part is described simply as "Parallel." In practice, all DDR SDRAM must comply with the SSTL_2 electrical standard, making this a difference in descriptive detail rather than functional substance; they are electrically equivalent in a compliant design.
Another key distinction is the nominal clock frequency (200MHz for Winbond vs. 166MHz for ISSI) and the related access time parameters. The W9412G6KH-5I offers higher theoretical bandwidth and a potentially superior speed grade. When substituting, it is essential to verify that the host controller is compatible with this higher frequency or can at least operate stably at 166MHz. Downward compatibility typically works, but it is advisable to validate system timing margins.
2. W9412G6KH-5 Substitution Conclusion
The feasibility of substituting the W9412G6KH-5 is identical to the conclusion for the -5I variant above, as the provided parameters show no technical differences between the two parts. The typical distinction between the "-5" and "-5I" suffixes relates to operating temperature range ("-5" likely indicates Commercial grade, 0°C to 70°C, while "-5I" indicates Industrial grade, -40°C to 85°C), but this is not reflected in the given specifications.
If the original application environment falls within commercial or standard industrial temperature conditions and does not require additional reliability certifications, the W9412G6KH-5 is also a viable replacement option. Its core differences from the original part remain the explicit SSTL_2 interface specification and the higher nominal clock frequency (200MHz). Consequently, it meets DDR electrical standards and its performance metrics are not inferior to the original component. As with the -5I variant, system timing compatibility should be verified during replacement.
Analysis ID: FF56-D15F000
Based on part parameters and for reference only. Not to be used for procurement or production.
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