Original Part
SRAM - Asynchronous Memory IC 4Mbit Parallel 10 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
Feasible, but qualifies as a substitution requiring verification; it is not a drop-in replacement. While the core technical specifications of the two chips are identical (4Mbit density, 256K x 16 organization, 10ns speed, parallel interface), two critical differences exist. First, the operating voltage range of the ISSI part is 2.4V to 3.6V, which is wider than the original part's 3.0V to 3.6V. This broader range offers compatibility with lower-voltage systems and presents no issue in standard 3.3V operation, constituting a favorable difference. Second, and most critically, the ISSI part uses a 48-TFBGA (6x8mm) package, whereas the original part is in a 48-CABGA (9x9mm) package. Their ballout (pinout/BGA layout) and physical dimensions are highly likely different, preventing direct soldering onto the original PCB design and necessitating a board layout redesign. Therefore, this substitution is viable for new designs but not feasible for retrofitting existing hardware.
2. Substitution Conclusion for IS61WV25616BLL-10BLI-TR
The substitution conclusion is identical to that for the IS61WV25616BLL-10BLI and is directly applicable. The "-TR" suffix typically denotes only the Tape and Reel packaging format, intended for automated SMT assembly. The electrical characteristics, functionality, performance, and package dimensions of the chip itself are exactly the same as the version without the "-TR" suffix. Consequently, the technical considerations for substitution—the advantageous voltage range and the obstacle of package incompatibility—are precisely the same, without any distinction. This variant is likewise a suitable alternative for new designs but equally unsuitable for existing hardware requiring pin-for-pin and package compatibility.
Analysis ID: FA4C-976D000
Based on part parameters and for reference only. Not to be used for procurement or production.
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