Original Part
SRAM - Synchronous, SDR Memory IC 9Mbit Parallel 117 MHz 7.5 ns 165-TFBGA (13x15)
Alternative Part
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 7.5 ns 165-CABGA (13x15)
SRAM - Synchronous, SDR (ZBT) Memory IC 9Mbit Parallel 8 ns 165-CABGA (13x15)
1. 71V65703S75BQG8 Substitution Conclusion
From the perspective of core electrical parameters and physical packaging, the 71V65703S75BQG8 is a highly viable substitute for the IS64LF25636A-7.5B3LA3-TR. Both devices are identical in all key specifications: they are 9Mbit synchronous SRAMs with a 256K x 36 organization, featuring the same 7.5ns access time, the same 3.3V operating voltage range (3.135V-3.465V), and the same 165-ball BGA package (13x15mm). The primary differences lie in the manufacturer (Renesas replacing ISSI) and the technology designation (ZBT). ZBT (Zero Bus Turnaround) is a read/write protocol designed to improve bus utilization; consequently, the 71V65703S75BQG8 may offer higher data throughput efficiency during continuous read/write operations. However, this typically does not affect basic compatibility with standard synchronous SRAM controllers. For supply chain diversification or cost considerations, this part can serve as a direct replacement.
2. 71V65703S80BQ Substitution Conclusion
The use of the 71V65703S80BQ as a substitute for the IS64LF25636A-7.5B3LA3-TR carries a risk of performance degradation and requires careful evaluation based on the system's timing margin. It shares identical memory organization, voltage, and package with the original part. However, its most critical performance parameter—the access time—is degraded from 7.5ns to 8ns. This reduction theoretically lowers its maximum synchronous operating frequency from approximately 133MHz (corresponding to a 7.5ns cycle) and may prevent the system from maintaining the original 117MHz clock frequency without relaxing timing constraints. Direct substitution in timing-critical, high-speed applications could lead to system instability or performance loss. The substitution is feasible only if the original design has sufficient timing margin or operates at a lower frequency.
Analysis ID: 3A20-9DFD000
Based on part parameters and for reference only. Not to be used for procurement or production.
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