Texas Instruments 20-SOIC SN74HCT540DW

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The part number "SN74HCT540DW" refers to a quadruple 2-input NAND gate IC from Texas Instruments' 74HCT series. This device is housed in a SOIC (Small Outline Integrated Circuit) DW package, which typically denotes a wide-body variant for surface-mount applications. The HCT series is designed for low-power consumption and provides high-speed performance while being compatible with both TTL and CMOS logic levels. It's commonly used in digital electronics for implementing logical functions where four independent NAND gates are required on a single chip.