BLM18SG331TN1D

• 330Ω Impedance at 100M Hz, 25% Tolerance
• 1.5A Maximum DC Current Rating and RMS Current
• 70mΩ DC Resistance
• 0603 Case Size (1608 metric), 1.6mm X 800µm X 650µm
• Ferrite core, Single line, Two-Terminal SMD/SMT Construction
• -55°C to 125°C Operating range, RoHS Compliant and Lead Free

The BLM18SG331TN1D is a multilayer ferrite bead from Murata in a 0603 (1608 metric) surface-mount case. It presents 330Ω impedance at 100M Hz with 25% tolerance, carries up to 1.5A of DC current and has 70mΩ DC resistance. Ferrite beads work by becoming resistive at high frequency, dissipating noise energy as heat while passing DC with minimal loss. The BLM18SG331TN1D measures 1.6mm by 800µm with a 650µm profile and is rated for -55°C to 125°C.

The BLM18SG331TN1D is placed in series with a power or signal line to suppress high-frequency noise that would otherwise radiate from the board or couple into sensitive circuits. Standard placements are on supply pins of oscillators, PLLs, RF sections and data converters, on the power feed to a noisy switching regulator, and on cable-facing I/O lines to help a product pass conducted and radiated emissions testing. The 1.5A rating and 70mΩ DC resistance allow it to sit on real power rails, not only on signal lines. Buyers are hardware designers working through EMC compliance and the contract manufacturers stocking commodity 0603 beads for volume assembly.