Back to top


- 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.

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 (169)

Image of Littelfuse's MRPR-20 Series of Power Reed Switches

High Voltage 50 W Power Reed Switches – MRPR-20 Series

Littelfuse's MRPR-20 series of high voltage at 50 watts of power reed switches are designed for reed relays and switching applications.

Learn More
Image of Littelfuse's miniASMDC Series

PolySwitch Automotive Resettable 1812 SMD Devices - miniASMDC Series

Littelfuse offers their miniASMDC series of automotive resettable SMD devices with a wide range of form factor and termination methods.

Learn More
Image of Littelfuse's nanoASMDC Series

PolySwitch Automotive Resettable SMD Devices - nanoASMDC Series

Littelfuse offers their nanoASMDC series of automotive resettable SMD devices with a wide range of form factor and termination methods.

Learn More
Image of Littelfuse's SP1255 andSP1555 Series TVS Diode Array

TVS Diode Array for USB V-BUS Surge Protection - SP1255 | SP1555 Series

Littelfuse's SP1255 and SP1555 series TVS diode arrays are optimized for fast-changing peripherals and portable electronics.

Learn More
Image of Littelfuse's SPxxxx Series

ESD Protection, 01005 Flip Chip Package – SP3145 | SP1043 | SP1044 Series

Littelfuse's SP3145, SP1043, and SP1044 series TVS diode arrays offer options for both high data-rate interfaces and general purpose applications.

Learn More
Image of Littelfuse's Pxxx0S3LNRP Series SIDACtor protection thyristors

SIDACtor® Low-Data-Rate Protection Thyristors - Pxxx0S3LNRP Series

Littelfuse's Pxxx0S3LNRP series SIDACtor® protection thyristors provide robust surge protection with lower switching threshold and on-state voltage than traditional protection solutions.

Learn More

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 6VWM 16VC SC703

TVS Diode Arrays

Duration: 15 minutes

Discussion of electrical threats that can damage devices and an introduction to Littlefuse's TVS Diode Arrays for ESD and lighting protection.

Featured Videos View All (18)

PolySwitch SMD Automotive PPTCs

PolySwitch AEC-Q200 qualified resettable SMD PPTC devices do not require replacement after a fault event; they allow the circuit to return to the normal operating condition after the power has been removed and the overcurrent condition is eliminated.

Gas Discharge Tubes (GDT) 5kA Surge – SH Series

The SH Series Gas Discharge Tube (GDT) is designed to provide high levels of protection against fast-rising transients caused by lightning disturbances. It is offered in a squared surface mount package (5.0×5.0×4.2mm) with a 5kA surge capability.

Littelfuse HMOV Varistor Series | Digi-Key Daily

Littlefuse's HMOV varistor series can operate at high temperatures and high surge.

LTKAK Series TVS Diode

Littelfuse Foldbak technology provides a clamping voltage lower than the avalanche voltage but above the rated working voltage. As a result, any voltage rise due to increased current conduction is minimized.

Additional Content

Brochures and Catalogs

Selection Guides



Resource Guides

SPICE Models

Application Notes - View All

Littelfuse CPD Acquired Products

Application Notes

Selection Guides

Manufacturer Web site