Littelfuse - Littelfuse offers POWR-GARD®, Teccor®, Wickmann®, Pudenz® and SIDACtor® brand circuit protection products, with a wide range of technologies such as fuses, PTCs, varistors, TVS diodes, thyristors and silicon protection arrays. As a worldwide leader in circuit protection products and solutions, the Littelfuse portfolio is backed by 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.
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 Digi-Key’s library of more than 1700 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.
These modules are available in audio and non-audio formats and listed by supplier in easy-to-find alphabetical order. Simply locate the module that interests you and click on your format of choice. We hope you find these tools useful, and with new modules added continuously, we invite you to stop back often to see what’s new.
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 | | TCMOV34S Series Thermal Varistor - The Littelfuse TCMOV 34S series consists of a 34 mm²-format varistor element (MOV) that offers high maximum surge capability (50 kA) together with an integrated thermally active element. The TCMOV 34S series varistor is designed specifically to protect high-energy circuits from the short circuit (SCCR) conditions and Abnormal Overvoltage Intermediate Current conditions as specified in UL1449 (3rd edition). The device integrates a micro-switch which is triggered by a mechanical structure that makes the indicator circuit isolated from the main power.
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 | | SMOV Series Varistor Integrated Thermal Disconnect UL1449 (3rd Edition) - Littelfuse's SMOV consists of a 25 mm square or 34 mm square varistor with an integrated thermal disconnect, designed to open in the event of overheating due to abnormal overvoltage as outlined in UL1449 (3rd edition). The device possesses a separate micro-switch that can be used to indicate when the MOV is disconnected from the circuit.
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 | | TMOV25S/34S Thermal Varistor - The Littelfuse TMOV® 25S and TMOV34S Varistor Series are specifically designed for applications that must meet the requirements of the Limited Current, Abnormal Overvoltage test in the UL1449 (3rd edition) Surge Protection Device (SPD) standard. The TMOV 25S and TMOV 34S Series meet the surge suppressor component recognition requirements of UL1449 for both cord-connected and permanently connected SPD end products in a single integrated package. A patented, thermally-responsive element within the body of the varistor will open the device in case of overheating, due to abnormal overvoltages.
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 | | 216SP Series 5 x 20 mm Single Pigtail Fuse - The 216SP Series fuse from Littelfuse is a ceramic body, fast-acting single cap fuse. The 216SP series fuse comes in a wide operating range with current ratings from 1 A to 10 A. The breaking capability of the 216SP series is consistent with the existing 216 series, which is capable of interrupting 1500 A at 250 V AC.
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Brochures and Catalogs
Selection Guides
SPICE Models
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).
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More about Littelfuse
Littelfuse - 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 and Pudenz. In addition, we're doing business all over the world.
Littelfuse/Teccor brand thyristors - Teccor Electronics manufactures a broad line of medium and low power thyristors. The products comprise two separate groups: SIDACtor transient voltage suppression (TVS) devices and power switching devices (SCRs, triacs, diodes, Diacs, and SIDACs). Over two thousand variations are listed in the catalog of standard components, and parametric screening is available for special applications.
Littelfuse/Wickmann brand product - Wickmann is a leading manufacturer of circuit protection components for applications in consumer electronics, industrial electronics, telecommunications and data processing. Wickmann has been engineering circuit protection solutions to set quality and performance standards for 80 years. Advancing innovation in fusing technology to contribute to our customer's success has always been our objective. Wickmann developed the 5x20mm cartridge fuse as well as the popular radial-leaded TR5 and axial-leaded Picofuse.
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Littelfuse Press Room
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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.
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LED Protection (PLED) Devices
Protecting LEDS in Product Designs
White paper covers entire LED circuit protection portion of the product design, tips and guidelines.
Open LED Protection for LED 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.
Thyristors
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.
Triac Protection
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.
Varistors
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. |
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