Original Part
SDRAM - DDR Memory IC 128Mbit Parallel 167 MHz 700 ps 66-TSOP
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. AS4C8M16D1A-5TCNTR Substitution Conclusion
Based on core electrical parameters and functionality, the AS4C8M16D1A-5TCNTR is a viable substitute for the original part. The key difference is an increased clock frequency from 167 MHz to 200 MHz, giving this device higher potential data throughput. This substitution not only fully meets the original design's timing requirements at 167 MHz but may also provide some performance headroom. Furthermore, while its package is designated as "TSOP II"—a slight nomenclature variation from the original "TSOP"—the physical dimensions (66-TSSOP, 10.16mm wide) and pinout are identical. This allows for a direct, PCB-land-pattern-compatible replacement. It is important to note that the manufacturer has changed from Micron to Alliance Memory. This shift requires evaluation from a supply chain and long-term sourcing reliability perspective.
2. AS4C8M16D1A-5TINTR Substitution Conclusion
The AS4C8M16D1A-5TINTR shares identical key parameters with the -5TCNTR part described above. Consequently, the substitution conclusion is largely the same: it offers direct replacement feasibility both in performance (200 MHz clock) and physical package (66-TSOP II). The primary distinction between the two typically lies in the "I" versus "C" in the suffix, which most likely indicates different temperature grades (e.g., Industrial vs. Commercial) or minor differences in packaging/reel specifications. Prior to substitution, it is critical to verify the exact temperature range denoted by the "-5TINTR" suffix. Confirmation must be made that this range meets or exceeds the operating temperature range supported by the original "-6T L:D TR" part. This verification is a prerequisite for ensuring stable and reliable operation in the target application environment post-substitution.
Analysis ID: 9C80-CBAD000
Based on part parameters and for reference only. Not to be used for procurement or production.
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