1. FMAT7620-9 Substitution Conclusion As a substitute, the FMAT7620-9 is fully compatible with and outperforms the original part in core performance, allowing for direct drop-in replacement. Key parameters such as attenuation (9 dB), impedance (50 Ω), rated power (2 W), and physical interface (SMA inline module) are identical, ensuring functional equivalence. The primary technical distinction lies in the frequency range: the original part (FMAT7466‑9) supports DC–12 GHz, whereas the FMAT7620‑9 extends the upper frequency limit to 18 GHz. The FMAT7620‑9 offers broader operational bandwidth and increased frequency performance margin. Within the 0–12 GHz band covered by the original part, its electrical performance remains equally stable and reliable. Moreover, this difference imposes no adverse effects on existing systems operating up to 12 GHz; instead, it provides headroom for potential high‑frequency expansion of the system. From both electrical performance and mechanical interface perspectives, this substitution is feasible and offers enhanced performance.