National Semiconductor, founded in 1959, was a major American semiconductor manufacturer known for its high-performance analog and mixed-signal integrated circuits. The company's product portfolio included a wide range of analog devices such as amplifiers, data converters, interface circuits, and power management products, which found applications in industries including automotive, communications, industrial, and consumer electronics. National Semiconductor was also renowned for its innovative solutions in areas like energy-efficient lighting, portable power management, and high-speed data converters. In 2011, Texas Instruments acquired National Semiconductor, integrating its product lines and technologies to further strengthen its position in the analog semiconductor market. Through its history, National Semiconductor made significant contributions to the advancement of analog and mixed-signal technology, leaving a lasting legacy in the semiconductor industry.