The 2661021801 is a ferrite EMI suppression bead manufactured by Fair-Rite Products, designed to suppress electromagnetic interference in electronic circuits. This 61 material grade bead features typical impedance values of 149 O at 100 MHz, 197 O at 250 MHz, 226 O at 500 MHz, and 257 O at 1000 MHz, with a DC bias field of 1.5 Oe for single-turn, single-ampere conditions. The bead has outer diameter (A) of 5.1 mm, inner diameter (B) of 1.45 mm, and length (C) of 11.1 mm, with a weight of 0.67 g, and the length dimension can be modified to suit specific applications. This component is ideal for EMI suppression in signal lines, power supplies, and data transmission applications where controlled impedance filtering is required to minimize noise and ensure signal integrity.