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 recommended. Although both devices are 4Mbit (256Kx16) asynchronous SRAMs and are functionally compatible at the core level, two critical differences exist. First, the access/cycle time is significantly degraded from 15ns to 55ns. The ISSI part operates much slower than the original and may fail to meet timing requirements or become non-functional in timing-critical systems. Second, the package changes from 48-CABGA to 48-TFBGA. The ball-out and mechanical dimensions are likely different, preventing direct mounting on the same PCB footprint. A PCB layout redesign is mandatory. Substitution may only be considered in applications where speed is not critical and board redesign is acceptable.
2. IS62WV25616BLL-55BLI-TR Substitution Conclusion
The conclusion is identical to that for the IS62WV25616BLL-55BLI: direct substitution is not recommended. The suffix “-TR” typically indicates only the tape-and-reel packaging format; there is no difference in electrical parameters, performance, or package between the -TR and non-TR versions. Like the base part, this variant shares the same two incompatibilities with the original device: significantly slower speed (55ns vs. 15ns) and a different package (TFBGA vs. CABGA). Therefore, the same constraints apply—potential performance degradation and the necessity of PCB modification.
Analysis ID: D25F-AC4E000
Based on part parameters and for reference only. Not to be used for procurement or production.
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