Littelfuse, Inc. designs, manufactures, and sells circuit protection devices for use in the automotive, electronic, and electrical markets worldwide. It operates in three segments: Electronics, Automotive, and Electrical. The Electronics segment provides fuses and protectors, positive temperature coefficient resettable fuses, varistors, polymer electrostatic discharge suppressors, discrete transient voltage suppression diodes, transient voltage suppression diode arrays and protection thyristors, gas discharge tubes, power switching components and fuseholders, blocks, and related accessories. This segment markets its products under the PICO II and NANO2 SMF brands to manufacturers of a range of electronic products, including mobile phones, computers, LCD TVs, telecommunications equipment, medical devices, lighting products, and white goods. The Automotive segment provides blade and high current fuses, battery cable protectors, and varistors. This segment markets its products under the ATO, MINI, MAXI, MIDI, MEGA, MasterFuse, JCASE, and CablePro brands to the automotive original equipment manufacturers and parts distributors of passenger automobiles, trucks, buses, and off-road equipment; and sells its fuses in the automotive replacement parts market. The Electrical segment offers power fuses and other circuit protection devices for industrial and commercial customers that are used in commercial and industrial buildings, and large equipment, such as HVAC systems, elevators, and machine tools. The company also provides a line of electromechanical and electronic switch and control devices for commercial and specialty vehicles; and sensors for automobile safety systems, as well as protection relays and power distribution centers for the safe control and distribution of electricity. Littelfuse sells its products through distributors, direct sales force, and manufacturers' representatives. The company was founded in 1927 and is headquartered in Chicago, Illinois.