Littelfuse, Inc. is a global manufacturer of circuit protection, power control, and sensing technologies. Founded in 1927 and headquartered in Chicago, Illinois, the company develops and produces a broad range of products designed to safeguard electrical and electronic systems across a variety of end markets. Littelfuse’s offerings include fuses, semiconductors, relays, and sensors, all engineered to protect against overcurrent, overvoltage, and thermal events in demanding applications.
The company’s product portfolio is organized into key segments such as Automotive, Industrial & Electronics, and Power & Sensor. In the automotive sector, Littelfuse supplies circuit protection devices, power distribution modules, and advanced sensing solutions for electric vehicles, internal combustion engines, and hybrid powertrains. For industrial and electronics customers, the company provides fuses, polymer positive temperature coefficient (PTC) devices, and surge protection components used in factory automation, telecommunications equipment, and consumer electronics. Littelfuse’s Power & Sensor division focuses on power semiconductors, such as silicon carbide MOSFETs, insulated-gate bipolar transistors (IGBTs), and current and temperature sensors.
With a global footprint spanning manufacturing facilities and technical centers in North America, Europe, Asia, and Latin America, Littelfuse serves customers in over 100 countries. The company’s international operations include production sites in China, Malaysia, Germany, India, and Mexico, as well as regional sales and engineering offices that support local design requirements and regulatory standards. Littelfuse has grown its market presence through a series of strategic acquisitions and partnerships aimed at enhancing its product breadth and accelerating entry into emerging technology areas such as sustainable energy and advanced driver-assistance systems.
Littelfuse is led by President and Chief Executive Officer Allen P. Vernier, who assumed the role in early 2021. Under his leadership, the company continues to focus on innovation, operational excellence, and customer collaboration. Littelfuse’s research and development teams work closely with automotive OEMs, industrial equipment manufacturers, and electronics designers to develop next-generation protection and control solutions that address evolving safety and performance challenges.
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