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. While the two devices are largely compatible in terms of memory capacity (4Mbit), organization (256K x 16), interface type (Parallel), and logic functionality, two critical differences preclude a drop-in replacement. First, there is a significant speed discrepancy: the original part features a 15ns access time, whereas this device is rated for 55ns. In systems requiring fast data access, a direct swap would lead to severe performance degradation or timing violations, potentially causing system failure. Second, the physical packages are incompatible. The original part uses a 9x9mm 48-CABGA, while this device is housed in a 6x8mm 48-TFBGA. The differing ball layout and footprint prevent installation on the same PCB pads. The sole advantage is its operating voltage range (2.5V~3.6V), which fully covers the original part's 3.3V requirement.
2. IS62WV25616BLL-55BLI-TR Substitution Conclusion
The substitution conclusion for this device is identical to that of the IS62WV25616BLL-55BLI: direct substitution is not recommended. The "-TR" suffix typically denotes Tape and Reel packaging for automated surface-mount assembly lines. The electrical characteristics, timing parameters (55ns access time), and physical package (6x8mm 48-TFBGA) are exactly the same as the version without the "-TR" suffix. Consequently, the same decisive performance gap in speed and physical package mismatch exists relative to the original target part, ruling it out as a direct replacement. If intended for use in the original design, concurrent modifications to the board layout and a thorough re-evaluation of system timing are mandatory.
Analysis ID: 3EB8-D995000
Based on part parameters and for reference only. Not to be used for procurement or production.
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