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
From a core functionality and configuration perspective, direct substitution for this part is technically possible but comes with critical limitations, making it generally not recommended. The most significant discrepancy lies in the access/cycle time (55 ns vs. 15 ns). Its operational speed is substantially slower than the original part. If the host system's timing design is based on a 15ns fast memory, switching to this slower device will fail to meet timing requirements, potentially leading to system performance degradation or operational failures. Secondly, while the pin count is identical, the package footprint (6x8mm 48-TFBGA vs. 9x9mm 48-CABGA) is almost certainly incompatible. The physical dimensions and ball map differ, preventing direct soldering onto the existing PCB pads and necessitating a board redesign. Its sole advantage is a wider operating voltage range (2.5V~3.6V), which offers more flexibility for the power supply system. However, this benefit does not offset the fundamental barriers posed by the speed and package mismatch.
2. IS62WV25616BLL-55BLI-TR Substitution Conclusion
The substitution conclusion for this variant is identical to the one above: direct replacement is not recommended. The "-TR" suffix typically denotes only the Tape and Reel packaging format for automated assembly. The die itself—its electrical characteristics, package dimensions, and timing parameters (55 ns, 6x8mm 48-TFBGA)—is exactly the same as the base part IS62WV25616BLL-55BLI without the "-TR" suffix. Consequently, it faces the same fundamental constraints: potential system timing issues due to significantly slower speed and physical package incompatibility preventing installation on the existing PCB. Selecting this variant only affects procurement and production line handling in terms of packaging; it does not resolve the core technical compatibility challenges.
Analysis ID: D866-EFA0000
Based on part parameters and for reference only. Not to be used for procurement or production.
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