The 2643172551 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 engineered to reduce conducted EMI across a broad frequency range from 1 MHz to hundreds of MHz, with typical impedance values of 14 O at 10 MHz, 24 O at 25 MHz, 55 O at 100 MHz, and 98 O at 250 MHz. The core features specific dimensional specifications including an outer length of 33.5 mm (±0.65 mm), width of 27 mm (±0.50 mm), and height of 8 mm (±0.40 mm), with a maximum cable dimension of 26.50 × 1.25 mm. This suppression core is ideal for applications requiring EMI mitigation in ribbon and flat cable assemblies, offering reliable performance in signal integrity and noise reduction for industrial, telecommunications, and consumer electronics applications.