1. Substitution Conclusion for AX3DBF1-125.0000T This device is fully compatible with the original part in all critical interfaces and physical dimensions (frequency, voltage, output type, package footprint), making it a viable drop-in replacement. The key performance differences are as follows: Frequency stability is improved from ±30ppm to ±25ppm, offering higher timing accuracy. Maximum operating current is significantly reduced from 65mA to 27mA, leading to a substantial decrease in power dissipation, which benefits system thermal design and overall power efficiency. Furthermore, the maximum current in the disabled state is reduced from 22mA to 10µA, rendering the shutdown static power consumption virtually negligible—a critical advantage for battery-powered or low-power applications. In summary, this model offers superior core performance and power efficiency compared to the original, making the substitution not only feasible but also beneficial for system-level optimization.