Original Part
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 8 ns 165-CABGA (13x15)
Alternative Part
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 150 MHz 3.8 ns 165-CABGA (13x15)
SRAM - Synchronous, SDR Memory IC 9Mbit Parallel 117 MHz 7.5 ns 165-TFBGA (13x15)
1. 71V65603S150BQGI8 Substitution Conclusion
The 71V65603S150BQGI8 is a highly viable substitute for the original 71V65703S80BQGI8, as it matches all key parameters: both are from the same manufacturer, Renesas, utilize the same ZBT (Zero Bus Turnaround) synchronous SDR technology, feature a 9Mbit memory density (organized as 256K x 36), operate within a 3.135V to 3.465V voltage range, and are housed in a 165-TBGA package. The primary differences are a significantly faster access time (3.8 ns vs. 8 ns) and a higher clock frequency (150 MHz vs. the original's lower, inferred frequency). This substitute offers a notable performance improvement, enabling faster read/write operations and lower latency. It can serve as a direct drop-in replacement in most applications and may even enhance system speed. However, system timing compatibility must be verified to ensure no signal overshoot or timing conflicts are introduced.
2. IS64LF25636A-7.5B3LA3-TR Substitution Conclusion
The feasibility of substituting the IS64LF25636A-7.5B3LA3-TR for the original 71V65703S80BQGI8 is low. While it shares basic specifications such as memory density (9Mbit, 256K x 36), voltage range (3.135V–3.465V), package (165-TBGA), and even a slightly faster access time (7.5 ns vs. 8 ns), a critical difference exists in the core technology. The original part employs ZBT (Zero Bus Turnaround) synchronous SDR technology, whereas this substitute uses standard synchronous SDR technology (ZBT is not specified). Consequently, it likely lacks the zero-wait-state operation and efficient bus turnaround characteristics inherent to ZBT architectures. In high-performance applications requiring ZBT timing—such as networking equipment or real-time systems—this substitution could lead to degraded system performance, timing mismatches, or functional errors. It should only be considered if the system design is explicitly compatible with non-ZBT SRAM; otherwise, direct replacement is not recommended.
Analysis ID: 7C7F-5E87000
Based on part parameters and for reference only. Not to be used for procurement or production.
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