3X Ferrite core split 7MM 500MHZ frequency min: 50MHz frequency max: 500MHz cable diameter max: 7mm ferrite mounting: split core impedance: 35ohm Series: ZCAT. ZCAT EMI ferrite suppression filters in plastic housings are clamped onto cables or wire providing EMI filter functions. This filter from TDK has an easily opened housing with a positive lock is reusable and can be used for any type of EMI and RFI filter application.