Back to top


- Littelfuse (NASDAQ: LFUS) - 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, IGBTs, Rectifier Bridges, Power Interface ICs, LED Protector, SIDACtor® Protection Thyristor as well as thermistors, thermistor probes,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

Related Product brands: IXYS Corporaton, IXYS Integrated Circuits Division, IXYS RF, MicroWave Technology, U.S. Sensor

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 (238)

Image of Littelfuse's Hybrid Battery Mini-Breakers (TCO and PPTC Devices) – MHP-TAC Series

Hybrid Battery Mini-Breakers (TCO and PPTC Devices) – MHP-TAC Series

Littelfuse’s MHP-TAC series hybrid battery mini-breakers (TCO/PPTC devices) offer higher voltage rating (12 VDC) and smaller size than typical MHP-TAM devices.

Learn More
Image of Littelfuse's PolySwitch® setPTM™ USB Type-CTM Over-Temperature Indicator

PolySwitch® setP™ USB Type-C Temperature Indicator

Littelfuse's PolySwitch® setP™ USB Type-C Temperature indicator helps protect USB Type-C plugs from overheating.

Learn More
Image of Littelfuse's High Temperature Sensitive, Standard, and Alternistor TRIACs

High-Temperature Sensitive, Standard, and Alternistor TRIACs

Littelfuse's high-temperature sensitive, standard, and alternistor TRIACs are well-suited for IoT applications that require compact design.

Learn More
Image of Littelfuse's Hybrid Protection Module for Ethernet PHY – SP4031 Series

Hybrid Protection Module for Ethernet PHY - SP4031 Series

The Littelfuse SP4031 hybrid protector offers both overcurrent and differential only overvoltage protection for applications such as 10/100/1000 BaseT ports.

Learn More
Image of Littelfuse's SP12xx Series High ESD Discharge AECQ Qualified TVS Diode Protection

High ESD Discharge AEC-Q101 Qualified TVS Diode Protection - SP12xx Series

Littelfuse's SP1212 and SP1220 discrete unidirectional TVS diodes provide high ESD protection level of ±30 kV for both contact and air discharge.

Learn More
Image of Littelfuse's LSIC1MO170E1000 SiC MOSFET

Silicon Carbide (SiC) MOSFET - LSIC1MO170E1000

Littelfuse's LSIC1MO170E1000 SiC MOSFET is used as a power semiconductor switch in high-frequency power systems that require a 1,700 V device.

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 (21)

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.

Resistance Temperature Detectors

Resistance Temperature Detectors

Duration: 5 minutes

Introduction of the Littelfuse thin film platinum resistance temperature detectors

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

Featured Videos View All (34)

Littelfuse AQ24CANFD TVS Diode Arrays | Digi-Key Daily

AQ24CANFD TVS diode arrays provide enhanced performance verification across a wider temperature range than most commercial products can offer and the clearly defined product flow from wafer creation to back-end processes ensure their provenance.

Publish Date: 2019-01-07

Littelfuse product Everywhere, Every Day

Many of the products you use every day contain Littelfuse products. They’re an integral part of smart phones, kitchen appliances, automotive electronics, HVAC, water/wastewater, energy, transportation, and beyond.

Publish Date: 2018-12-18

Littelfuse 242 Series | Digi-Key Daily

242 series fuses from Littelfuse are for barrier circuits in intrinsic safety electrical equipment in extremely hazardous locations.

Publish Date: 2018-11-19

NANO2® High-Voltage 500 V DC SMT Fuses – 885 Series

Littelfuse's 885 series Nano2® fuse is a 500 VDC high-voltage DC rated surface mount fuse with high interrupting current rating up to 1500 A.

Publish Date: 2018-09-12

Additional Content

Related Suppliers

Brochures and Catalogs

Selection Guides



Resource Guides

SPICE Models

Application Notes - View All

White Papers

Littelfuse on Social Media

Littelfuse CPD Acquired Products

Application Notes

Selection Guides

Manufacturer Web site