Littelfuse, Inc., founded in 1927 by Edward V. Sundt, is a leading American electronic manufacturing company headquartered in Chicago, Illinois. The company's core mission is to provide innovative circuit protection solutions, electronic switches, and automotive sensors to enhance safety and reliability in various applications. Littelfuse offers a wide range of products including fuses, battery management systems, capacitors, and power semiconductors, catering to industries such as automotive, industrial, and electronics. With over 40 facilities worldwide, Littelfuse serves a global market.

Notable figures associated with Littelfuse include CEO David W. Heinzmann. The company is publicly traded on Nasdaq under the ticker LFUS and is a component of the S&P 400. Littelfuse has achieved significant financial milestones, reporting a revenue of $2.36 billion and a net income of $259 million in 2023. Employing approximately 18,000 people globally, the company has made substantial contributions to the electronics industry through its innovative products and solutions, solidifying its reputation as a global leader in circuit protection and electronic manufacturing.