1. Substitution Conclusion for 74FCT162245CTPVCG4 The 74FCT162245CTPVCG4 is functionally equivalent to the original 74FCT16245ETPAG in terms of logic operation and supply voltage range, both being non-inverting transceivers with 2-element 8-bit architecture and 3-state outputs. However, two critical differences must be noted: First, its output current capability is reduced to 24 mA (both high and low levels), compared to the original’s 32 mA (high) and 64 mA (low). This lower drive strength may lead to signal integrity degradation or timing issues when driving heavy loads or long traces. Second, the package is changed to a 48‑BSSOP (7.50 mm width), which is wider than the original 48‑TFSOP (6.10 mm width). This requires PCB layout redesign and may not be compatible with existing footprint pads, increasing substitution complexity. Therefore, this device can only be considered as a replacement in low‑load applications where current demand and package compatibility are not critical.