What is the meaning of hc in 74hc245?

Answer 1

74xx Standard 74ALSxx Advanced Low Power Schottky 74ASxx Advanced Schottky 74Fxx Fast Schottky 74Hxx High Power 74HCxx High Power CMOS 74Lxx Low Power 74LSxx Low Power Schottky 74Sxx Schottky

Answer 2

In the context of "74HC245", "HC" stands for High-Speed CMOS (Complementary Metal-Oxide-Semiconductor). This indicates that the 74HC245 is a type of CMOS integrated circuit that operates at a high speed.