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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 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 (195)

Image of Littelfuse's 438GT Series 0603 Fuses

High I2t SMT 0603 Size Fuses – 438GT Series

Littelfuse's 438GT series of 0603 size fuses are designed to provide overcurrent protection to circuits that operate under high ambient temperatures.

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Image of Littelfuse's SP3530 Series Diodes

TVS Diode for Automotive 22 kV ESD Applications - SP3530 Series

Littelfuse's SP3530 series of unidirectional automotive TVS diodes provides a high level of ESD protection for automotive applications.

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Image of Linear Technology's SP3522 Series Diodes

TVS Diode 0.15 pF 22 kV for ESD Automotive Applications - SP3522 Series

Littelfuse's SP3522 series of TVS diodes are ultra-small and have an ultra-low capacitance for ESD protection in AEC-Q101-qualified high-speed applications.

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Image of Littelfuse's SP3422-04UTG TVS Diode Array

TVS Diode Array 4-Channel ESD Protection - SP3422-04UTG

Littelfuse's SP3422-04UTG series 4-channel TVS diode array's low loading capacitance also makes it ideal for protecting high-speed signal pins.

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Image of Littelfuse's Silicon Carbide (SiC) Ultra-Fast Switching MOSFET - LSIC1MO120E0080

Silicon Carbide (SiC) Ultra-Fast Switching MOSFET - LSIC1MO120E0080

Littelfuse's silicon carbide (SiC) MOSFET LSIC1MO120E0080 comes in ratings of 1200 V, 80 mOhm in a TO-247-3L package.

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Image of Littelfuse's SP3222 Series TVS Diode Arrays

TVS Diode Array Low Capacitance ESD Protection – SP3222 Series

Littelfuse's SP3222 series of 0.9 pF, 30 kV, dual-channel TVS diode arrays designed for ESD protection for high speed data lines.

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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 (16)

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

TVS Diode 14VWM 23.2VC SMA

Transient Voltage Suppression (TVS) Diodes

Duration: 20 minutes

Overvoltage protection general concepts, key parameters of TVS diodes, and a look at Littelfuse's TVS diode families.

Featured Videos View All (24)

Littlefuse 514 Series Fuses | Digi-Key Daily

514 series fuse from Littlefuse is a 6 mm x 32 mm 500 VAC ceramic body fuse with current ratings from 1.6 A to 12.5 A.

SP11xx Series TVS Diode Arrays

Learn more about the Littelfuse SP11xx Series Discrete Unidirectional TVS Diodes.

Littelfuse DST Series Schottky Diode Rectifiers

Learn more about the Littelfuse DST Series Ultra Low VF Schottky Barrier Rectifier.

Littelfuse Surge Protection Modules LSP10GIHP

Learn about the LSP10GIHP surge protectors through their applications and LED protection optimization.

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Littelfuse CPD Acquired Products

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