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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.

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 (162)

Image of Littelfuse's TVS Diodes Compact 400W SOD-123FL SMF4L Series

TVS Diodes 400 W SOD-123FL - SMF4L Series

Littelfuse's SMF4L series 400 W TVS diode can deliver 400 W at 10/1000 μs, but in a 50% smaller footprint than the SMA package, that is easy to lay out and well-suited for use in compact designs.

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Image of Littlefuse's SP0544T and SP7538P Series

TVS Diode Arrays for High Speed Signals - SP0544/SP7538 Series

Littelfuse's TVS diode array safeguards high-speed interfaces from damage due to electrostatic discharges (ESD). Typical applications for both the SP0544 and SP7538 series ESD protection for interfaces such as V-By-One, Embedded DisplayPort, USB 2.0/3.0 Ports, and HDMI.

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Image of Littelfuse's TPSMF4L Series TVS Diodes

TVS Diodes - AEC-Q101 Automotive Qualified 400 W - TPSMF4L Series

Littelfuse's TPSMF4L series TVS diodes are AEC-Q101 qualified protection for automotive electronics and portable devices that require high reliability.

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Image of Littelfuse SLD8S Series Automotive TVS Diodes

TVS Diodes – AEC-Q101 Automotive Qualified 7000 W – SLD8S Series

SLD8S series automotive SMT transient voltage suppression (TVS) diodes from Littelfuse offer a choice of 7000 W (10/1000 μs) or 2200 W (load dump) peak pulse power dissipation ratings in a surface-mount SMTO-263 package.

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Image of Littlefuse's HMOV Varistor Series

Varistors for High Temperature and High Surge - HMOV™ Series

Littlefuse's HMOV varistor series can operate at ambient temperatures up to 125°C with 2500 V isolation voltage for various applications.

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Image of Littelfuse's SP3118/SP3130 Series TVS Diode Arrays

TVS Diode Arrays - Ultra-Low Leakage and Capacitance - SP3118 / SP3130 Series

The SP3118 and SP3130 series TVS diode arrays from Littelfuse includes back-to-back TVS diodes fabricated in a proprietary silicon avalanche technology.

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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 (17)

Littelfuse Semiconductor Insight

Littelfuse Semiconductor insight, innovation, and impact: the total product ownership experience.

Littelfuse Automotive Electronics

Littelfuse Automotive Electronics: a smartphone on wheels.

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.

Littelfuse Building and Home Automation

Building and Home Automation with Littelfuse

Additional Content

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Resource Guides

SPICE Models

Application Notes - View All

Littelfuse CPD Acquired Products

Application Notes

Selection Guides

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