The BLM21AG601SN1D is a SMD Chip Ferrite Bead with 0805 case. It is designed to function nearly as a resistor at noise frequencies, which greatly reduces the possibility of resonance and leaves signal wave forms undistorted. BLM series is effective in circuits without stable ground lines because BLM series does not need a connection to ground. The nickel barrier structure of the external electrodes provides excellent solder heat resistance. It generates an impedance from the relatively low frequencies. Therefore BLM_A series is effective in noise suppression in a wide frequency range (30MHz to several hundred MHz).
The WE-CBF series from Wurth Elektronik are surface mount EMI suppression ferrite beads. These ferrite beads offer excellent anti EMI properties and low DC resistance. WE-CBF ferrite beads can be soldered directly on printed circuit board.