1. XLL326125.000000I Substitution Conclusion The XLL326125.000000I serves as a high-performance direct replacement. Both devices are fully matched in core functionality and mechanical compatibility. They are 125MHz, 2.5V supply, LVDS-output crystal oscillators with an enable function, sharing identical package dimensions (3.2mm x 2.5mm) and pinout, allowing for a direct pad-to-pad substitution. The primary technical distinction lies in the operating current: the maximum operating current for the XLL326125.000000I (34mA) is significantly lower than the original part's 66mA. Substitution will substantially reduce overall system power consumption, improving energy efficiency and lowering thermal dissipation. This is a key advantage for battery-powered devices or applications with stringent thermal design requirements. Given that all other critical parameters, such as frequency stability (±25ppm), remain consistent, this model delivers equivalent signal integrity and timing performance while achieving superior power efficiency. Therefore, the substitution is highly feasible and offers a direct performance enhancement. It is recommended to conduct powered bench testing on the target PCB prior to formal volume replacement to finally validate electrical compatibility and signal quality.