WE-PBF Flat Wire High Current SMD Ferrite Beads Würth Elektronik WE-PBF High Current SMD Ferrite Beads are flat wire types for high current (up to 18A), high-frequency designs. With an operating temperature of -55°C to +125°C, the Wurth WE-PBF High Current SMD Ferrite Beads offer an impedance range from 42Ω to 98Ω and a maximum DC resistance of 0.6mΩ to 0.9mΩ.