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 the two devices are compatible in terms of memory capacity (4Mbit), organization (256K x 16), interface (Parallel), and pin count (48), two critical differences preclude a drop-in replacement. First, there is a significant disparity in access/cycle time (55 ns vs. 15 ns). The substitute's speed is only 27% of the original's. If the original system design relies on the 15ns fast access, the substitution will cause timing violations, leading to system instability or complete failure. Second, the package footprint is likely incompatible. The original device uses a 48-CABGA (9x9mm) package, while the substitute is a 48-TFBGA (6x8mm). Their BGA ball maps and physical dimensions are almost certainly different, making them unsolderable on the same PCB pads. Consideration is only possible in systems with extremely low-speed requirements (>55ns) and a willingness to redesign the PCB layout.
2. IS62WV25616BLL-55BLI-TR Substitution Conclusion
The conclusion is identical to that for the IS62WV25616BLL-55BLI: direct substitution is not recommended. The "-TR" suffix typically denotes a Tape and Reel packaging format for automated assembly. The electrical characteristics, timing parameters, and physical package of the "-TR" variant are identical to those of the version without the suffix. The core incompatibilities with the original target part remain the same as above: the speed (55ns vs. 15ns) is too slow to meet high-speed timing requirements, and the package (48-TFBGA vs. 48-CABGA) has incompatible physical dimensions and ball maps. They are not directly interchangeable, facing the exact same constraints.
Analysis ID: 5D1D-E8AE000
Based on part parameters and for reference only. Not to be used for procurement or production.
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