Littelfuse | X-ON

Littelfuse, Inc. is a globally recognized technology company specializing in circuit protection, power control, and sensing technologies. Founded in 1927, the company has grown from a small fuse manufacturer into a diversified industrial technology leader serving a wide array of industries, including automotive, industrial, electronics, telecommunications, and consumer electronics. Littelfuse’s mission is to improve safety, reliability, and performance across critical applications by offering innovative, high-quality solutions.

Company Overview

• Founded: 1927

• Founder: Edward V. Sundt

• Headquarters: Chicago, Illinois, USA

• Global Reach: Operations in over 15 countries

• Employees: 17,000+ worldwide

• Product Categories

Littelfuse offers thousands of products across three main business units:

1. Electronics

Littelfuse is best known for its electronic components that protect, control, and sense electronic circuits and devices.

Key Products:

• Fuses: PTC resettable fuses, surface-mount fuses, cartridge fuses

• TVS Diodes: Protect against electrostatic discharge (ESD), lightning, and power surges

• ESD Protection Devices: Protect USB, HDMI, and Ethernet ports

• SIDACtors & Thyristors: For telecom and surge protection

• Varistors: Metal-oxide varistors (MOVs) for transient suppression

• Gas Discharge Tubes (GDTs)

• Diodes & Rectifiers

• Polymer ESD Suppressors

These components are vital in consumer electronics, telecom, medical devices, and IoT products.

2. Automotive

Littelfuse is a key partner in the evolution of automotive safety, electrification, and connected mobility.

Automotive Solutions Include:

• Blade Fuses and Fuse Blocks

• High Voltage Fuses (for EV/HEV applications)

• Battery Management Components

• Power Distribution Modules

• Current and Temperature Sensors

• Relays and Solid-State Devices

Their products are used in passenger cars, commercial vehicles, EVs, and autonomous vehicles to enhance reliability and safety.

3. Industrial

Littelfuse provides solutions for the protection and control of electrical systems in harsh industrial environments.

Industrial Product Lines:

• Industrial Fuses

• Protection Relays

• Motor Protection Switches

• Surge Protection Devices (SPDs)

• Disconnect Switches

• Power Semiconductors (SCRs, IGBTs)

• Magnetic and Proximity Sensors

These are critical in factory automation, renewable energy systems, mining, oil & gas, and HVAC applications.

Core Technologies and Innovations

Littelfuse continues to lead through innovation in key technology domains:

1. Circuit Protection

Littelfuse invented the first small, fast-acting protective fuse for electronics and remains a top brand in overcurrent and overvoltage protection.

2. High Voltage EV Fuses

With the rise of electric vehicles, Littelfuse has developed EV-grade fuses capable of handling 1000V+ and high current loads in demanding environments.

3. Sensor Technology

Littelfuse manufactures a variety of sensing devices including:

• Hall Effect Sensors

• Magnetic Proximity Sensors

• Reed Switches

• Temperature Sensors

• Current Sensors

These sensors are used in automotive, industrial, and consumer systems to improve system intelligence and automation.

4. Power Semiconductors

Through the acquisition of IXYS Corporation, Littelfuse has significantly expanded into the power semiconductor market with:

• MOSFETs

• IGBTs

• Gate Drivers

• Rectifiers
  These devices are essential for efficient power conversion in industrial, renewable, and motor control systems.

Key Industries Served

Littelfuse products are integrated into systems across numerous sectors:

Global Manufacturing & Distribution

Littelfuse operates manufacturing facilities and technical centers across:

• North America: USA, Mexico

• Europe: Germany, Lithuania, the Netherlands

• Asia: China, the Philippines, India, Thailand

• Sales Offices and Distributors: In over 150 countries

Its products are available through major global distributors like Xon Electronic, Digi-Key, Mouser, RS, and Arrow.

Certifications and Standards

Littelfuse components meet or exceed rigorous global standards:

• UL, IEC, RoHS, REACH certified

• ISO 9001: Quality Management

• IATF 16949: Automotive Industry Standard

• ISO 14001: Environmental Management

• ISO 45001: Occupational Health & Safety

Sustainability & Corporate Social Responsibility

Littelfuse is committed to:

• Reducing carbon footprint with energy-efficient products

• Recycling and responsible sourcing of materials

• Diversity and inclusion in the workplace

• Community outreach and educational initiatives

The company publishes an annual Sustainability Report outlining its goals and progress.

Key Advantages of Choosing Littelfuse

Littelfuse in the Future

Littelfuse is investing heavily in the future of:

• Electric Mobility (EV/HEV)

• Smart Grids and Microgrids

• Industrial IoT (IIoT)

• Renewable Energy Storage

• Advanced Sensing and Data Analytics

As industries grow more connected and electrified, Littelfuse will remain at the forefront of protection, control, and sensing technologies that make these transitions safer and more reliable.

Littelfuse is more than just a component supplier—it is a technology partner dedicated to powering and protecting the devices, vehicles, and systems that shape our world. With a century of experience, a global footprint, and a culture of continuous innovation, Littelfuse continues to be the go-to brand for reliable electronic components, especially in critical circuit protection applications.