The Fair-Rite 5943003821 is a Toroid Core designed for optimal performance in a wide range of applications. Manufactured from Material 43, this core offers excellent magnetic properties. The inductance factor (A_L) is specified at 38 nH/N², with a tolerance of +/-25%, ensuring consistent and predictable performance. The A value is 14.5nH/N^2. As an authorised distributor, Supreme Components International guarantees the authenticity and quality of this Fair-Rite product. This toroid core is perfect for creating custom inductors, transformers, and chokes. Its toroidal shape minimizes electromagnetic interference (EMI) and provides efficient magnetic flux containment. Choose the 5943003821 for your next project and experience the reliability and performance of Fair-Rite ferrite cores.