1. Substitution Conclusion for 633L12505I2T Based on core electrical parameters, package, and functionality, the 633L12505I2T demonstrates potential for direct substitution of the original part. Both devices are identical in frequency, voltage, output type, package dimensions, and frequency stability. The most significant deviation is the maximum operating current: 66mA for the CTS part versus 34mA for the original. Consequently, under the same 2.5V supply, the power dissipation of the CTS device (~165mW) will be substantially higher than that of the original (~85mW). This difference could have a material impact on the system's overall power budget, supply design, and thermal management. Functional substitution is feasible if the board has sufficient power headroom and the supply rail can support the near-doubling of current draw. Otherwise, in high-density or power-sensitive applications, this substitution may lead to overheating or supply rail issues.