The 2643178351 is a 43 material grade flat cable EMI suppression core manufactured by Fair-Rite Products for reducing conducted electromagnetic interference in multi-conductor flat cable applications. This ferrite core accommodates flat cables with widths ranging from 12.7 mm (0.500 inch) to 77 mm (3.0 inches) and operates across a frequency range from 1 MHz to hundreds of MHz. The core features typical impedance values of 29 O at 10 MHz, 45 O at 25 MHz, 72 O at 100 MHz, and 101 O at 250 MHz, with dimensions of 18.5 mm × 13.5 mm × 12 mm and a weight of 5.9 grams. These cores are ideal for applications requiring EMI suppression in ribbon cables, flex circuits, and multi-conductor flat cable assemblies, offering reliable performance in signal integrity and noise reduction across industrial, telecommunications, and consumer electronics applications.