The 5977003821 is a Toroid Core from Fair-Rite, a leading manufacturer of ferrite components. Supreme Components International is an authorised distributor, ensuring you receive genuine, high-quality products. This core is constructed from 77 Material, offering a balance of permeability and core loss characteristics. Toroid cores are widely used in electronics for their self-shielding properties and efficient magnetic flux containment. Applications include power inductors, transformers, common mode chokes, and noise filters. The 5977003821 provides excellent performance in a compact form factor, making it suitable for a wide range of electronic designs. Trust Supreme Components International for all your Fair-Rite component needs.