Littelfuse - As the worldwide leader in circuit protection, Littelfuse offers POWR-GARD®, Teccor®, Wickmann®, Pudenz®, Hamlin®, PulseGuard® and SIDACtor® branded products, with a wide range of technologies such as Fuses, PTCs, GDTs, Varistors, TVS Diodes, TVS Diode Arrays (SPA®), Switching Thyristors, as well as reed switches, relays and sensors. Littelfuse products are backed by more than 85 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.
Digi-Key’s library of more than 2000 exclusive PTM Online… On Demand® product training modules is a collection of training tools created with you – the busy design engineer – in mind. They are provided with the cooperation of participating supplier partners. From this one source, you can learn about the latest products and technologies, download datasheets, check inventory, contact our technical staff, and place an order for same-day shipment.
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|Reed Switch 5 Watt SPDT MDRR-DT Series - The Hamlin brand MDRR-DT reed switch is a miniature changeover switch with a 14.73 mm x 2.54 mm (0.58" x 0.100") glass envelope. This device is UL recognized, switches 175 VDC at 5 W, and has a sensitivity range of 15-30 AT. The MDRR-DT series also features minimum voltage breakdown 200 VDC, as well as 109 ohms insulation resistance.
|Relays Miniature SIL HE3600 Series - The Hamlin brand HE3600 miniature SIL relay is a reed relay with normally open or data switching contacts capable of switching up to 200 VDC at 10 W. This UL recognized device is available with 5 V, 12 V, and 24 V coils. Suitable applications include telecoms, instrumentation, process control, and industrial.
|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. They provide robust surge current handling capability.
|328 and 688 Series Surge-Tolerant Fuses - The new 328 and 688 series fuses offer protection superior to that of circuit breakers, providing short-circuit and overload protection and ensuring long-term reliability for outdoor applications that operate at high-surge-exposure levels. They also reduce the level of nuisance fuse tripping caused by indirect lightning surges.
Brochures and Catalogs
||The eBook mobile app is available for both Apple and Android devices. Visit the App Store or Google Play to install the free "Littelfuse Catalog" app.
Using SPICE Models is the standard way to simulate circuit performance prior to the prototype stage as an additional step of testing to ensure that a circuit works properly before investing in prototype development. The models provided here were developed (or revised) using WinSpice, a port of Berkeley Spice3F4 to Win32, and should be compatible with most SPICE2 or SPICE3-based circuit simulators (such as PSPICE).
|More about LittelfuseLittelfuse
- Since Edward V. Sundt founded Littelfuse in 1927, we've been driven by innovation. Sundt invented the first small, fast-acting protective fuse to prevent sensitive test meters from burning out. From that pioneering first step, our company has gone on to define the standards of the circuit protection industry. In the 1960s, we developed sub-miniature fuses for NASA, which were mission-critical components of the American space program. And in 1976, we introduced the groundbreaking Autofuse® Fast-Acting Fuse for General Motors. Within eight years, it was being designed into vehicles all over the world.
We again revolutionized automotive fuse protection in 1986 with the debut of the space-saving MINI®. Its smaller design allowed for the additional protection of on-board electronic accessories. Recently, we introduced the world's smallest high surge current protection thyristor, the Teccor Q2L series "C-Rated" SIDACtor device. And we continue to set new benchmarks. As the world leader in circuit protection, Littelfuse possesses nine core technologies, as well as some of the industry's most respected brands - Teccor, Wickmann, Hamlin, and Pudenz. In addition, we're doing business all over the world.
||Hamlin, Inc. is a leader in sensor technology, providing standard products and custom solutions for leading global manufacturers in the automotive, electronics and industrial markets. Littelfuse acquired Hamlin in 2013.
||Concord Semiconductor is a leading Taiwan-based designer and manufacturer of TVS diodes and other overvoltage circuit protection products that protect equipment from high voltage/high energy transients. Littelfuse acquired Concord Semiconductor, based in Taiwan, in 2006.
||The Pudenz brand of automotive circuit protection products includes blade fuses, bolt-down fuses, fuse-holders and aftermarket fuse products. Littelfuse acquired the Pudenz brand as part of its acquisition of Heinrich Industrie of Witten, Germany, in 2004.
||Smart Glow automotive blade fuses feature an indicator light that glows when the fuse is blown, saving time in troubleshooting an open circuit. Smart Glow fuses are sold through leading national automotive aftermarket retailers and distributors. Littelfuse acquired the Smart Glow line from Catalina Performance Accessories of Montainburg, Arkansas, in 2006.
||Teccor Electronics has a market-leading line of overvoltage transient suppression products. It has the number-one market share position in North America and is in the top three globally for both of its product categories. Littelfuse acquired Teccor of Irving, Texas, in 2003.
||Prior to being acquired by Littelfuse, Wickmann was a leading manufacturer of circuit protection components for the consumer electronics, industrial electronics, telecommunications and data processing markets for more than 80 years. Littelfuse acquired the Wickmann brand as part of its acquisition of Heinrich Industrie AG of Witten, Germany, in 2004.
|Littelfuse Press Room
||Littelfuse varistors recognized for advanced technology
The TMOV technology used in outdoor LED lighting and solar power applications optimize designs for safety and long-term reliability.
Learn more about the winner
||Littelfuse Announces Acquisition of Hamlin
"The acquisition of Hamlin is a major step forward in our strategy to build a global, automotive sensor platform", read more about the acquisition.
Circuit Protection Application Matrix
Offers comprehensive overview of overcurrent protection and overvoltage suppression devices available, as well as a guide to choosing appropriate device type for a specific application
AT vs mT and Gauss
What magnetic strength will activate a reed switch. Understanding the terms AT, mT and Gauss
Modifying Reed Switches
Importance of proper bending and cutting of leads on a Glass Reed Switch
Soldering recommendations for reed relays and reed switches
Lighting Protection Devices
LED Lighting Design Guide
PLED Protecting LEDS in Product Designs
White paper covers entire LED circuit protection portion of the product design, tips and guidelines.
PLD Open LED Protection for Light Strings
Using the PLED in LED strings, application information.
ESD and Transient Protection
USB 3.0 Port ESD Circuit Protection
Selecting the right TVS Diode Array for USB 3.0.
Ethernet Port Lightning, ESD and EFT Protection
Selecting the right TVS Diode Array for Ethernet Ports.
Transient Suppression Devices and Principles AN9768
Discusses two major categories of transient suppressors: attenuation and diversion of transients.
Selecting an Appropriate ESD Device
Guidance on ESD devices for designers looking for a successful first pass design.
Tips for Enhancing ESD Protection
Various techniques a designer can employ in meeting ESD Testing.
SP72x Protection Arrays Meeting ESD (IEC 61000-4-2) AN9612
Covers IEC 61000-4-2 ESD immunity and transient current capability for the SP72X Series protection arrays.
Fundamental Characteristics of Teccor® Thyristors AN1001
Presents the basic fundamentals and terminology of SCR, Triac, Sidac, and Diac thyristors.
Phase Control Using Teccor® Thyristors AN1003
Fundamentals of SCR and Triac phase controls, shows how this is possible.
Gating, Latching, and Holding of Teccor® SCRs and Triacs AN1002
Describes how the SCR and Triac parameters are related. Helps users select best operating modes for various circuit applications.
Miscellaneous Design Tips and Facts for Teccor® Thyristors AN1009
Relationship of IAV, IRMS, and IPK, dv/dt Definitions, gate terminations, Impulse waveform, failure modes and more.
Maximum Ratings and Characteristics for Teccor® Thyristors AN1008
Explains maximum ratings and describes the irreversible damage that may occur and how to avoid such issues.
SIDACtor device used to protect thyristors being subjected to excessive peak off-state voltage.
Data Line Protectors
SIDACtor device used in the protection of data lines (such as Ethernet and RS-232).
LAN / WAN Protectors
SIDACtor device for 10/100Base-T Protection, compliant to GR1089 intra-building design.
Littelfuse Varistors: Basic Properties, Terminology and Theory AN9767
Describes the basic electrical properties of varistors.
Varistor Testing AN9773
Details the common tests of varistor parameters and describes suitable test methods using simplified test circuits.
The ABCs of MOVs AN9311
Guide for MOV products, A is for Application, B is for Basics, C is for Common questions.
The ABCs of Multilayer Suppressors AN9671
Guide for Multilayer MOV products, A is for Application, B is for Basics, C is for Common questions.
"ML" Multilayer Surface Mount Surge Suppressors AN9108
Applications, construction and capabilities of ML, MLE, MLN and AUML version multilayer suppressor.
Littelfuse Varistor Design Examples EC638
Common application examples, and illustrating the solution process for the appropriate varistor.
Protection Relay and Controls
Browse Protection Relay accessories
Network communications support files for Littelfuse Startco relays
Online Demos & Tools
Learn more about using and programming Littelfuse Startco relays with online user interface demos
View Protection Relay product videos