1. 71V65703S75BQG Substitution Conclusion Based on a technical parameter comparison, the 71V65703S75BQG is identical to the original part 71V65603S133BQG in terms of memory capacity, organization, interface type, voltage range, and package. The primary difference is an increase in access time from the original 4.2 ns to 7.5 ns. This indicates a significantly slower memory response, which may limit the system's maximum operating frequency or increase access latency. Substitution may be viable if the target application has relaxed timing requirements—for instance, if the system clock frequency can be reduced to a range compatible with the 7.5 ns access time—and if the resulting performance degradation is acceptable. However, in high-speed synchronous applications, such as those originally designed for the 133 MHz frequency of the original part, the 7.5 ns access time may fail to meet timing margins, potentially compromising system stability or performance. Therefore, a thorough evaluation of specific timing conditions is essential before substitution.