FCB-0603-400P Substitution Conclusion Based on a comprehensive analysis, the FCB-0603-400P can be used as a direct replacement for the original part number BBPY00160808400Y00. The two ferrite beads share identical key electrical parameters, including an impedance of 40Ω @ 100MHz, a rated current of 3A, and a maximum DC resistance of 35mΩ. Their performance in power line filtering, current handling capability, and power loss is equivalent. The primary difference lies in the slightly greater maximum height of the FCB-0603-400P (1.00mm versus 0.95mm). However, this 0.05mm variance is negligible under standard 0603 package assembly processes and is unlikely to cause mechanical interference or soldering issues. For the vast majority of applications, this dimensional difference has no practical impact. In terms of electrical performance and package compatibility, the two components can be considered functionally interchangeable.