1.53AS105-K03N3 Substitution Conclusion The 53AS105-K03N3 has limitations as a substitute for the original part FMAT7624-3. The key discrepancy lies in its frequency range, which is limited to 0 Hz to 10 GHz, whereas the original part covers 0 Hz to 18 GHz. In applications where the system operates above 10 GHz—such as in microwave communications or high-frequency testing—this substitute cannot guarantee signal integrity and attenuation accuracy, potentially leading to performance degradation or system failure. Although other critical parameters—including attenuation value (3 dB), power rating (5 W), impedance (50 Ω), and package (N-type inline module)—match the original specifications, and the different manufacturers (Rosenberger vs. Fairview Microwave) may introduce supply chain variations, the reduced frequency range remains the primary constraint. The 53AS105-K03N3 is only a viable alternative if the system’s operating frequency is strictly confined below 10 GHz; otherwise, its use is not recommended. 2.FMAT7461-3 Substitution Conclusion The FMAT7461-3 presents a highly feasible alternative to the original FMAT7624-3. The main variation is the frequency range, reduced from 0 Hz to 18 GHz down to 0 Hz to 12.4 GHz. All other parameters—attenuation (3 dB), power handling (5 W), impedance (50 Ω), and package (N-type inline module)—remain consistent with the original part. Additionally, the manufacturer is the same (Fairview Microwave), which helps ensure compatibility and quality consistency. While this substitute cannot support applications above 12.4 GHz, such as certain radar or satellite communication bands, it fully meets performance requirements for systems operating at or below 12.4 GHz, including most wireless communications and test equipment. Provided the system’s frequency requirements do not exceed 12.4 GHz, the FMAT7461-3 serves as a direct and reliable replacement.