Wurth WE-AFB Series Ferrite Beads Wurth Elektronik WE-AFB Series EMI suppression axial ferrite beads are made from NiZn a material which works in a broad frequency range. These ferrite beads have an operating temperature of -25°C to +125°C. The applications the WE-AFB series are used for; wires, coaxial cables, wire wrapping cables, cable e.g power supplies, data and signal lines and also multi conductor wires.