The 2643178651 is a flat cable EMI suppression core manufactured by Fair-Rite Products that accommodates multi-conductor flat cables in widths ranging from 12.7 mm (0.500 inch) to 77 mm (3.0 inches). This ferrite core is engineered to reduce conducted EMI across a broad frequency range from 1 MHz to hundreds of MHz, with typical impedance values of 10 O at 10 MHz, 17 O at 25 MHz, 34 O at 100 MHz, and 54 O at 250 MHz. The core features precise dimensional specifications including an overall length of 26.5 mm (±0.40 mm), width of 21.5 mm (±0.40 mm), and thickness of 6 mm (±0.30 mm), with a total weight of 4.1 grams. This suppression core is ideal for applications requiring effective EMI mitigation in ribbon and flat cable assemblies, offering reliable performance in signal integrity and electromagnetic compatibility across industrial, telecommunications, and consumer electronics applications.