SMD 1806 Ferrite Filters- BLM41P Series BLM series ferrite beads from Murata do not require a ground connection and are ideal for use in circuits with unstable ground lines. The nickel barrier construction of the external electrodes provides excellent resistance to solder heat. These ferrite beads are designed to function nearly as resistors at noise frequencies, leaving signal wave forms undistorted and reducing the possibility of resonance. Applications This series of ferrite beads are designed for general use applications.