The 2661000801 is a ferrite EMI suppression bead manufactured by Fair-Rite Products, designed to suppress electromagnetic interference across a wide frequency range. This 61 material grade bead features typical impedance values of 90 O at 100 MHz, 120 O at 250 MHz, 147 O at 500 MHz, and 183 O at 1000 MHz, with a DC bias field of 1 Oe per ampere-turn. The bead has outer diameter (A) of 7.4 mm, inner diameter (B) of 2.25 mm, and length (C) of 7.55 mm, with a weight of 1 gram, and the length dimension can be modified to suit specific applications. These beads are commonly used in signal conditioning, power supply filtering, and high-speed data line protection where guaranteed minimum impedance specifications are required for effective EMI suppression.