1. 71V65703S80BQG Substitution Conclusion From the perspective of core electrical specifications and physical package, this part number is a viable direct substitute. The key differences are as follows: 1. Access Time/Frequency: The original part is rated at 7.5ns (117MHz), while the substitute is rated at 8ns, resulting in a slightly lower theoretical maximum operating frequency. However, for most designs not operating at the frequency limit, this delta typically falls within the system timing margin and can be validated by re-evaluating timing closure. 2. Technical Feature: The substitute is explicitly specified with a ZBT (Zero Bus Turnaround) architecture. This is a pipelined synchronous SRAM that supports read/write operation switching with zero wait states, offering higher data throughput efficiency. The original part does not explicitly specify this feature. If the original design relies on standard synchronous SRAM timing, this discrepancy may require verification of controller configuration compatibility. Furthermore, while the package is identical (165-ball TFBGA, 13x15mm), it is imperative to rigorously verify and confirm an identical pinout, which is a prerequisite for a successful substitution.