TC74AC521P(F),
TC74AC540F(F),
TC74AC540FT(EL),IC BUFFER INVERT 5.5V 20TSSOP
TC74AC540P(F),
TC74AC541F(EL,F),IC BUFFER NON-INVERT 5.5V 20SOP
TC74AC541F(F),
TC74AC541P(F),
TC74AC573F(F),