MG, MH, & MU Chip Ferrite Beads Bourns MG, MH, and MU Chip Ferrite Beads are surface mount ferrite beads with a wide range of impedance and current ratings. These RoHS compliant ferrite beads feature packages ranging from 0402 to 1812, impedance ratings from 10Ω to 2.5kΩ, and current ratings up to 6A. Bourns MG, MH, and MU Chip Ferrite Beads are resistant to heat, humidity, mechanical shock, and pressure.