1. FMAT7620-10 Substitution Conclusion The FMAT7620-10 can fully replace the SA3SR-10 and offers notable advantages in high-frequency applications. Both parts share identical key specifications—10 dB attenuation, 2 W power handling, 50 Ω impedance, and package outline—while the FMAT7620-10 extends the frequency range to DC–18 GHz, significantly exceeding the original part’s 3 GHz upper limit. The substitute not only covers all low-frequency operating conditions of the original part but also supports higher-frequency microwave applications such as 5G, radar, and satellite communications. Its broader bandwidth reflects superior high-frequency performance and manufacturing precision. If the existing application does not exceed 3 GHz, the substitution introduces no compatibility issues and instead provides headroom for future system upgrades.