TC74VHC541 TC74VHC541A TC74VHC541AF TC74VHC541AFT TC74VHC541F TC74VHC541F(EL TC74VHC541F(EL) TC74VHC541F(EL,K,F TC74VHC541F(EL,K,F) TC74VHC541F(EL.F)