The 5943001001 is a ferrite toroidal core manufactured by Fair-Rite Products, featuring a ring configuration that optimizes intrinsic ferrite material properties for electromagnetic applications. This toroid is supplied with Parylene C coating (indicated by the 9th digit "1" in the part number), which provides environmental protection while increasing the outer and inner dimensions by a maximum of 0.038 mm. The core exhibits an inductance factor (AL) of 510 nH (±20%), an effective cross-sectional area of 0.37 cm², and an effective core volume of 2.7 cm³, making it suitable for power input filters, ground-fault interrupters, common-mode filters, and pulse and broadband transformers. The toroid is RoHS compliant and all cores are supplied burnished to break sharp edges, ensuring reliable performance in demanding electromagnetic filtering and signal conditioning applications.