Texas Instruments 20-SOIC SN74ALS561ADWR

The part number SN74ALS561ADWR refers to a quad 2-input NAND gate IC from Texas Instruments. This device belongs to the 74ALS logic family, which is an advanced low-power Schottky (ALS) variant of the 7400 series TTL logic chips. It contains four independent gates each accepting two inputs and providing a single output, functioning as a NAND logical operation. The 'DWR' suffix indicates it comes in a small-outline transistor (SOT)-23-6 package, suitable for compact designs where space-saving is critical.