TC74VHC04FT TC74VHC04FT 电源IC TC74VHC04FT(EK2M) TC74VHC04FT(EL TC74VHC04FT(EL) TC74VHC04FT(EL,K) TC74VHC04FT(EL.M) TC74VHC04FT(ELK TC74VHC04FT(ELK) TC74VHC04FT(ELKM)