1. 74FCT16245ETPAG Substitution Conclusion Based on the comparison, the 74FCT16245ETPAG can serve as a full electrical and functional substitute for the original part, CY74FCT16245CTPVC. Both devices are 16-bit non-inverting, 3-state transceivers with identical logic architecture (two independent 8-bit sections), operating voltage range (4.5V to 5.5V), and output drive capability (32mA high-level, 64mA low-level). This ensures complete functional equivalence and signal integrity within the circuit. The primary difference lies in the package footprint. The original device uses a 48-SSOP package with a body width of 7.50mm, whereas the substitute uses a 48-TSSOP (also known as TFSOP) package with a narrower body width of 6.10mm. Due to this reduced package width, the existing PCB land pattern designed for the original part will likely not be compatible. Successful implementation requires using a land pattern that matches the mechanical dimensions of the new package. Therefore, the PCB layout must be adapted or redesigned accordingly. Provided the new package can be physically accommodated and the PCB modifications are feasible, this substitution is electrically and functionally viable.