NTE74LS197,置换半导体 MOD-16 BIN CNTR/LTCH
NTE74LS20,置换半导体 DUAL 4-IN NAND DIP14
NTE74LS22,置换半导体 DUAL 4-IN NAND O/C
NTE74LS221,置换半导体 NONSTBLE MULTIVIBRTR
NTE74LS240,置换半导体 OCT BUF/DRVR DIP-20
NTE74LS242,置换半导体 QUAD BUS TRNSCVR INV
NTE74LS243,置换半导体 QUAD BUS TRNSCVR N-I
NTE74LS244,置换半导体 OCT BUF/DRV/RCV 3-ST
