【NXP Semiconductors】74HC21DB,门（与/非与/或/非或） DUAL 4-INPUT NAND GATE
【NXP Semiconductors】74HC21DB,112,IC DUAL 4-IN AND GATE 14SSOP
【NXP Semiconductors】74HC21DB,118,IC DUAL 4-IN AND GATE 14SSOP
【NXP Semiconductors】74HC21DB-T,门（与/非与/或/非或） DUAL 4-INPUT NAND GATE
【NXP Semiconductors】74HC21PW,112,IC GATE AND DUAL 4INPUT 14TSSOP
