Design Tools

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

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

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

Download Littelfuse circuit protection catalogs and relay control apps.

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

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.