The 5943001401 is a toroidal ferrite core manufactured by Fair-Rite Products, designed for use in electromagnetic and RF applications. The core features an outer diameter of 25.40±0.6 mm, inner diameter of 15.50±0.5 mm, and height of 8.15±0.3 mm, with a magnetic path length of 61.7 mm and effective cross-sectional area of 39.5 mm². Electrically, the core exhibits an initial inductance (Lo) of 0.805 nH and an inductance change (?L) of 645±20% nH at 10 kHz under less than 10 gauss, with a loss tangent of =50×10?6 at 100 kHz. This toroid is commonly used in power supplies, filters, transformers, and RF circuits where controlled inductance and minimal losses are required.