Split emi suppression ferrite cable cores meisongbei sf 90a a cylindrical split ferrite cable core that can take a max cable diameter of 90mm the core has an impedance of 60omega at 25mhz and 130omega at 100mhz this device will greatly reduce both common and differential mode emirfi and is a cost effective solution for retrofit and post assembly use for internal and external power and data cables meisongbei sf 90a 90mm split ferrite cable core