The BLM21AG121SN1D ferrite bead with 0805 dimensions and 120 ohms of impedance is a passive electronic component produced by the Murata Electronics company. This ferrite bead is a fast and efficient power noise-suppression device designed to be used in high-frequency circuits. Its most common use is to reduce the level of common-mode and differential-mode noise in data and power lines while maintaining a low signal skew. The BLM21AG121SN1D ferrite bead has a small size of only 0805 (20.32 mm^2) with low DC resistance of only 0.12 ohms. When used in combination with a capacitor, the BLM21AG121SN1D can provide excellent filtering capability up to 1 GHz. The device tests according to IEC 60384-14 standards, and is RoHS compliant. Additionally, it features a lead-free, halogen-free, and solder-free construction.