The 5961000211 is a 61 toroid parylene-coated ferrite core manufactured by Fair-Rite Products for use in inductive components and closed magnetic circuit applications. This NiZn ferrite core features an initial permeability (µi) of 125 and is optimized for frequencies up to 25 MHz, with additional capability for EMI suppression above 200 MHz. The core has an outer diameter (A) of 9.74 mm, inner diameter (B) of 4.56 mm, and height (C) of 3.34 mm, with a weight of 0.830 g. Key electrical properties include an inductance factor (AL) of 55 nH (±25%), effective cross-sectional area (Ae) of 0.0720 cm², effective path length (le) of 2.07 cm, and effective core volume (Ve) of 0.1500 cm³. The parylene coating provides RoHS compliance and withstands a minimum breakdown voltage of 1000 Vrms, making it suitable for power input filters, ground-fault interrupters, and other noise suppression applications requiring reliable performance across industrial and consumer electronics.