SANTA CLARA, Calif., Dec. 16, 2010 /PRNewswire/ -- National Semiconductor Corp. (NYSE: NSM ) today marked the 20-year anniversary of its SIMPLE SWITCHER® brand of products. Since 1990, electronic system engineers around the world have created designs featuring National's SIMPLE SWITCHER products, with over 1.5 billion units shipped to date. More than 100,000 engineers design power supplies with SIMPLE SWITCHER power modules, voltage regulators and controllers each year, with end applications spanning the entire electronics industry, from automotive to industrial.