2. 74FCT16245TPVCG4 Substitution Conclusion This part is functionally substitutable, but special attention must be paid to its enhanced drive capability. It matches the original in basic logic function, bit width, and supply voltage. The key technical difference is the output current: the original part specifies 24mA (sink/source), while this substitute offers 32mA (source) / 64mA (sink). This device provides greater fan-out and improved ability to drive capacitive loads, potentially offering better performance when driving heavy loads or long traces. However, during substitution, the impact of its higher switching currents on system power integrity and signal integrity (e.g., overshoot) must be evaluated, as these effects may not have been accounted for in the original design, particularly in high-speed or noise-sensitive applications. The package difference is the same as noted in the first conclusion.