Original Part
SRAM - Asynchronous Memory IC 4Mbit Parallel 15 ns 48-CABGA (9x9)
Alternative Part
SRAM - Asynchronous Memory IC 4Mbit Parallel 55 ns 48-TFBGA (6x8)
SRAM - Asynchronous Memory IC 4Mbit Parallel 55 ns 48-TFBGA (6x8)
1. IS62WV25616BLL-55BLI Substitution Conclusion
Direct substitution is not feasible. Although the two devices match in basic specifications (4Mbit density, 256Kx16 organization, parallel interface) and voltage compatibility (the ISSI part supports a wider range that includes the original part's 3.0-3.6V), there are two critical and irreconcilable differences. First, the speed discrepancy is significant: the original part has a 15ns access time, whereas the ISSI part is rated at 55ns. The ISSI chip's read/write speed is considerably slower than the original design. If the system timing margin is insufficient, direct replacement will lead to data corruption or system failure. Second, the physical packages are incompatible: the original part uses a 48-CABGA (9x9mm) package, while the ISSI part comes in a 48-TFBGA (6x8mm) package. Their ball maps and package dimensions are entirely different, preventing direct soldering onto the same PCB footprint.
2. IS62WV25616BLL-55BLI-TR Substitution Conclusion
Direct substitution is not feasible, with its viability being identical to that of the IS62WV25625616BLL-55BLI. The "-TR" suffix typically denotes tape-and-reel packaging for automated assembly and does not alter the chip's electrical or physical characteristics. This variant shares the same core technical discrepancies with the aforementioned IS62WV25616BLL-55BLI: the substantial speed gap (55ns vs. 15ns) and the package mismatch (48-TFBGA (6x8mm) vs. 48-CABGA (9x9mm)). Consequently, it faces the same risks of system timing violations due to insufficient speed and physical incompatibility due to differing package dimensions and pad layouts.
Analysis ID: 97EE-DDA3000
Based on part parameters and for reference only. Not to be used for procurement or production.
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