Original Part
SRAM - Asynchronous Memory IC 4Mbit Parallel 15 ns 48-CABGA (9x9)
Alternative Part
SRAM - Asynchronous Memory IC 4Mbit Parallel 10 ns 48-TFBGA (6x8)
SRAM - Asynchronous Memory IC 4Mbit Parallel 10 ns 48-TFBGA (6x8)
1. Substitution Conclusion for IS61WV25616BLL-10BLI
From the perspective of core electrical parameters and functionality, the IS61WV25616BLL-10BLI can serve as a substitute for the original part, with one critical limitation. The key differences are as follows: First, the access time (10 ns vs 15 ns) and write cycle time (10 ns vs 15 ns) are faster. The ISSI device offers superior performance and is fully backward compatible in terms of timing requirements. Second, it features a wider operating voltage range (2.4V-3.6V vs 3.0V-3.6V). In the original design's nominal 3.3V system, the ISSI device maintains good compatibility and offers greater tolerance to power supply fluctuations. Third, and most importantly, the package dimensions differ (6x8mm 48-TFBGA vs 9x9mm 48-CABGA). The ball map and physical footprint are incompatible, preventing direct soldering onto the PCB pads designed for the original part. A board layout redesign is mandatory for implementation. While the ISSI device is a direct and superior electrical substitute, it cannot be used as a pin-to-pin (drop-in) replacement due to mechanical package incompatibility.
2. Substitution Conclusion for IS61WV25616BLL-10BLI-TR
The substitution conclusion for the IS61WV25616BLL-10BLI-TR is identical to that for the IS61WV25616BLL-10BLI. The "-TR" suffix typically denotes only the Tape and Reel packaging format, intended for automated surface-mount assembly lines. The electrical characteristics and package specifications of the device itself are completely identical to the version without the "-TR" suffix. Its comparative differences with the original part are exactly the same: superior performance (speed), a wider voltage range, but mechanical package incompatibility. Therefore, while it is also a functionally qualified substitute and its supply packaging is better suited for volume production, the fundamental constraint remains: the PCB design must be modified to accommodate the new package dimensions and ball map.
Analysis ID: 021F-6F2B000
Based on part parameters and for reference only. Not to be used for procurement or production.
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