Texas Instruments 20-SOIC SN74ALS639ADWRG4

The part number SN74ALS639ADWRG4 refers to a quad 2-line to 1-line data selector/multiplexer from Texas Instruments. This device belongs to the SN74ALS family, which features advanced low-power Schottky (ALS) technology for TTL logic circuits. It has four independent 2-input multiplexers with tristate outputs, allowing it to route two input lines to a common output under the control of select signals. The 'ADWRG4' suffix indicates specific packaging and environmental characteristics: 'A' denotes the military temperature range (-55°C to +125°C), 'DWR' stands for Widebus SOIC package with潮湿敏感要求, and 'G4' represents lead-free status in compliance with RoHS standards.