1. SN74HCT04APWRG4 Substitution Conclusion The SN74HCT04APWRG4 can serve as a full drop-in replacement for the MC74HCT04ADTR2G. Both ICs share identical core logic functionality, channel count, supply voltage range, input threshold levels, and output drive capability, while maintaining physical package compatibility—forming the basis for direct substitution. Key differences are noted as follows: First, the maximum static supply current of the SN74HCT04APWRG4 (2 µA) is slightly higher than that of the original part (1 µA). This may warrant attention in battery-powered applications where standby power consumption is critically constrained, though the impact is negligible for the vast majority of designs. Second, the SN74HCT04APWRG4 specifies a nominally faster maximum propagation delay (16 ns @ 5.5 V, 50 pF) compared to the original (17 ns @ 5 V, 50 pF), and is tested under a more stringent voltage condition. Under identical operating conditions, the TI device may offer marginally faster switching performance or at least remain comparable, providing slightly greater timing margin in the system. In summary, this substitution is both feasible and reliable from both electrical performance and mechanical package perspectives.