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- Littelfuse (NASDAQ: LFUS) - As the worldwide leader in circuit protection, Littelfuse offers POWR-GARD®, Teccor®, Wickmann®, Pudenz®, Hamlin®, PulseGuard®, SIDACtor®, PolySwitch, 2Pro and PolyZen branded products, with a wide range of technologies such as Fuses and Accessories, PTCs (PolySwitch), GDTs, Varistors, Polymer ESD Suppressors, Surge Protection Modules, TVS Diodes, TVS Diode Arrays (SPA® Diodes), Switching Thyristors, Power Modules, LED Protector, SIDACtor® Protection Thyristor as well as reed switches, relays and Hall Effect sensors. Littelfuse products are backed by more than 88 years of technology innovation, industry leading technical support, design and manufacturing expertise. Littelfuse products are vital components in virtually every product that uses electrical energy, including automobiles, computers, consumer electronics, handheld devices, industrial equipment, and telecom/datacom circuits.

Littelfuse acquires IXYS Corporation, Manufacturer of Power Semiconductors

Littelfuse acquires U.S. Sensor, Manufacturer of Temperature Sensors

TVS Diodes

TVS Diodes

Littelfuse TVS diodes are used to protect semiconductor components from high-voltage transients. Learn More

SPA® Family of TVS Diode Arrays

SPA Family of TVS Diodes

Littelfuse SPA family of TVS diode array devices are designed to protect electronics from very fast and often damaging voltage transients. Learn More

Magnetic Sensors and Reed Switches

Sensor Thumbnail

Littelfuse's selection of magnetic sensors includes reed switches, reed sensors, Hall Effect sensors, and reed relays, as well as bare and packaged magnetic actuators. Learn More

Product Listing View All

Featured Products

Image of Littelfuse's LSP Series LED Thermally Protected Surge Protective Device

LSP Series LED Thermally Protected Surge Protective Device

The LSP05 and LSP10 Surge Protection Modules from Littelfuse provide transient overvoltage protection for outdoor and commercial LED lighting fixtures. Learn More

Image of Littelfuse's MG Series IGBT Power Modules

MG Series IGBT Power Semiconductor Modules

An expanded offering of IGBT module power semiconductor products for motor control and inverter applications is now available from Littelfuse. Learn More

Newest Products View All (209)

Image of Littelfuse's High Current 500VAC Compact Cartridge Fuses – 606 Series

High Current 500 VAC Compact Cartridge Fuses – 606 Series

Littelfuse's 606 series high-current fuse allows circuit designers to reduce the amount of board space they reserve for protection components.

Learn More
Image of Littelfuse's SP1053 and SP1054 Series TVS Diode Arrays

ESD Protection for I/O and Power Ports - SP1053/SP1054 Series

Littelfuse's SP1053 and SP1054 series are designed to provide ESD protection for I/O and power ports in consumer electronics and retail product applications.

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Image of Littelfuse MDSR-10 Series Sub-Miniature Reed Switch

Sub-Miniature 10 mm, 10 W Reed Switch – MDSR-10 Series

Littelfuse’s subminiature MDSR-10 series reed switches are hermetically sealed in a glass encapsulation to protect it from external environmental hazards.

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Image of Littelfuse's 438A Series AECQ-Compliant 0603 Size SMT Fuses

AECQ-Compliant 0603 Size SMT Fuses - 438A Series

Littelfuse's 438A series fuses are AECQ-compliant, fast-acting, and offer excellent temperature stability and performance reliability.

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Image of Littelfuse's 476 Series Subminiature SMT Fuses

Subminiature SMT Fuses Protect LED Lighting - 476 Series

Littelfuse's 476 series of SMT fuses are designed to mainly serve as primary side circuit protection for compact devices with high voltage requirements.

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Image of Littelfuse AQ Series Automotive Qualified TVS Diode Arrays (SPA®)

Automotive Qualified TVS Diode Arrays (SPA®) – AQ Series

Littelfuse's AQ series TVS diode arrays offer a durable approach for protecting data lines, charging lines, control lines, drivetrain, and communication ports.

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Tools and Support

Image of Littelfuse's LED Lighting Surge Protection Modules

LED Lighting Surge Protection Modules Design and Installation Guide

Design Guide for the LSP series SPD Modules, part selection and importance of adding this module to LED lighting applications. Learn More

Image of Littelfuse's Sensors Product Catalog

Sensors Product Catalog and Design Guide

This Guide provides introduction to magnetic sensing and offers practical suggestions for selecting reed switches, reed sensors and Hall effect sensors for a variety of applications. Learn More

Image of Littelfuse's TVS Diode Applications Overview

Transient Voltage Suppressor Application Overview

Application overview of different voltage transients that can occur and how to apply TVS Diode protection. Learn More

Image of Littelfuse's IGBT and Rectifier Diode Modules

IGBT and Rectifier Diode Power Semiconductor Modules Guide

Quick selection guide on circuit type, package type, collector emitter voltage and amperage rating options available IGBT and Rectifier modules. Learn More

Image of Littelfuse's ESD Protection Using TVS Diode Arrays

ESD Protection using TVS Diode Arrays Design Guide

This guide was developed to help designers navigate a selection of appropriate TVS Diode Array circuit protection, includes consideration factors, example circuits and recommended components. Learn More

Image of Littelfuse's Fuseology 101

Introduction to Circuit Protection - Fuseology 101

User friendly Fuseology Selection Guide makes the process quick and easy by helping with all the key parameters in selecting the proper over current protection Fuse or PTC resettable device. Learn More

Product Training Modules View All (17)

Image of Littelfuse TMOV

Thermally Protected MOVs - TMOVs

Duration: 5 minutes

An introduction to basic operation, electrical characteristics, product portfolio, features and benefits, and applications for TMOVs.

protecting network and telecommunication port

Top 5 Design Considerations

Duration: 20 minutes

This presentation will provide the top five criteria to consider when performing a protection need analysis for Network or Telecommunication interface.

Reed Switches

Reed Switch Basics

Duration: 5 minutes

Basic operation, terminology, characteristics, and applications will be discussed, as well Q&A on selecting the proper reed switch


Fuseology - Introduction to Fuses

Duration: 5 minutes

Fuses are instrumental circuit protection devices designed to serve as overcurrent protectors in a circuit

Featured Videos View All (28)

Littelfuse SJ Series Thyristors

This video explains Littelfuse SJ Series Thyristors.

Publish Date: 2018-06-28

High Current 500VAC Compact Cartridge Fuses – 606 Series

High-current 500VAC Cartridge Fuses – 606 Series

Publish Date: 2018-06-21

Littelfuse MHP-TAT18 Series Breaker | Digi-Key Daily

MHP-TAT18 mini-breaker with resettable thermal cut-off (TCO) from Littelfuse helps circuit designers meet the battery safety requirements of the higher-capacity lithium-ion polymer and prismatic battery cells.

Publish Date: 2018-05-09

Littelfuse MP8000 Bluetooth Overload Relay

See how the Littelfuse Bluetooth Overload Relay uses the smartphone to protect motors and pumps while saving time and keeping customers safe from arc flash.

Publish Date: 2018-03-19

Additional Content

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SPICE Models

Application Notes - View All

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Littelfuse CPD Acquired Products

Application Notes

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