NTE74LS47,置换半导体 BCD-TO-7 SEG DECODER
NTE74LS490,置换半导体 DUAL BCD CNTR DIP-16
NTE74LS51,置换半导体 DUAL AND/OR INVRT GT
NTE74LS54,置换半导体 AND/OR INVRT DIP-14
NTE74LS540,置换半导体 OCT BUF/DRV DIP-20
NTE74LS541,置换半导体 OCT BUF/DRV DIP-20
NTE74LS55,置换半导体 AND/OR INVRT DIP-14
NTE74LS624,置换半导体 VOLT CNTRL OSC DIP14
