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Design Tools

Access online design tools, tutorials, demos, videos, catalogs, mobile apps, and more.

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Competitor Cross-Reference

Need the Littelfuse equivalent of a competitor's part? Enter a part number to see what we offer and to order a sample.

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eCatalogs

Download our product catalogs for easy viewing and selection of our automotive, industrial, and electronic products.

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Industrial Relay Product Selection Guide

This selection guide will help you improve safety, reduce costs, and minimize downtime by helping you choose the best relay for your application.

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Littelfuse Mobile Apps

Download Littelfuse circuit protection catalogs and relay control apps.

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PCB Footprints & 3D Models

Download or request free PCB symbols, footprints and 3D models of Liittelfuse components. Our files integrate with all major ECAD software packages.

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Surge Protective Device Selection Guide

SPDs are not one-size-fits-all devices. This easy-to-use selection guide will help you quickly pick the optimal device for your system.

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