The 2643168751 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-based core is available in two material grades (31 and 43) and is designed to reduce conducted EMI across a frequency range from 1 MHz to hundreds of MHz. The core exhibits typical impedance values of 36 O at 10 MHz, 56 O at 25 MHz, 90 O at 100 MHz, and 142 O at 250 MHz, with dimensions specified as A: 25.4 mm, B: 17.8 mm, C: 12.7 mm, D: 10.15 mm, and E: 2.55 mm. These cores are ideal for applications requiring EMI suppression in ribbon cables and flex circuits, offering both split and single core configurations with optional assembly clips for easy installation.