Original Part
Alternative Part
120 Ohms @ 100 MHz 1 Power, Signal Line Ferrite Bead 0603 (1608 Metric) 200mA 300mOhm
1. MG1608-121Y Substitution Conclusion
The MG1608-121Y is not a direct drop-in replacement for the original part BLM18AG121SN1D. Although both share the same package size (0603) and nominal impedance (120Ω @ 100MHz), the MG1608-121Y has a rated current of only 200mA—one quarter of the original’s 800mA—and its DC resistance (DCR) of 300mΩ is significantly higher than the original’s 180mΩ. Under the same operating current, the MG1608-121Y will experience higher temperature rise and voltage drop, which may lead to thermal overstress or increased power loss. Therefore, it is suitable only for lower-current signal lines and cannot cover the power-handling applications intended for the original part.
2. MH1608-121Y Substitution Conclusion
The MH1608-121Y shows potential as a substitute, but its high-frequency performance matching must be evaluated. Its rated current (2A) and DC resistance (100mΩ) are both better than those of the original part (800mA, 180mΩ), offering superior current-handling capability and lower conduction loss. Package size and impedance at 100MHz also match the original. However, the ferrite bead’s impedance-frequency curve may differ due to variations in core material and manufacturing technology. A single-point impedance match at 100MHz does not guarantee identical filtering performance across the entire frequency range. It is recommended to review the impedance-frequency curves before substitution, especially in applications with broad noise spectra where careful verification is advised.
Analysis ID: CB06-FB03000
Based on part parameters and for reference only. Not to be used for procurement or production.
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