1. SIT8208AI-G1-18E-62.500000T Substitution Conclusion Direct substitution of this device for the original part is not feasible, primarily due to a critical mismatch in supply voltage: the substitute operates at 1.8V, whereas the original requires 2.5V. This implies that without adjusting the system supply, direct replacement may result in undervoltage operation, causing the output levels to fall outside LVCMOS/LVTTL specifications or potentially damaging the device. Additionally, the substitute’s maximum operating current is 31mA (30mA when disabled), slightly lower than the original’s 33mA (31mA disabled), indicating a marginal reduction in power consumption, which is not a core concern. All other parameters—frequency, stability, output type, and package—are identical. Therefore, functional substitution is possible only if the system can provide a 1.8V supply; otherwise, a power circuit redesign is required.