Original Part
120 Ohms @ 100 MHz 1 Signal Line Ferrite Bead 0603 (1608 Metric) 500mA 200mOhm
Alternative Part
120 Ohms @ 100 MHz 1 Signal Line Ferrite Bead 0603 (1608 Metric) 500mA 150mOhm
1. BLM18AG121SN1D Substitution Conclusion
The BLM18AG121SN1D (Murata) aligns closely with the original part in key parameters such as impedance characteristics and package dimensions. The primary differences are its higher rated current (800mA vs. 500mA) and lower DC resistance (180mΩ vs. 200mΩ). This part can handle greater operating current while generating lower DC voltage drop and less heat, making it a viable direct substitute with some performance margin. It should be noted, however, that it is not explicitly designated for signal line use (Filter Type unspecified), which may lead to slight variations in high-frequency attenuation. Verification of high-frequency noise suppression performance in the actual circuit is recommended.
2. MMZ1608R121CTAH0 Substitution Conclusion
The MMZ1608R121CTAH0 (TDK) is compatible with the original part in impedance, package length, and width, and is likewise intended for signal line applications. Its main advantages are a significantly lower DC resistance (150mΩ vs. 200mΩ), which further reduces signal loss, and a lower profile (0.75mm vs. 0.95mm), beneficial for compact designs. However, its rated current is identical to the original (500mA); therefore, applications with substantial current ripple should be evaluated carefully. Overall, this part is a feasible substitute in both electrical and mechanical characteristics, and its lower DC resistance offers a distinct advantage for signal integrity.
Analysis ID: 90F2-4292000
Based on part parameters and for reference only. Not to be used for procurement or production.
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