FMAT7620-20 Substitution Conclusion The FMAT7620-20 is fully capable of replacing the original SA3SR-20 part, as both share identical key specifications (20 dB attenuation, 2 W power handling, 50 Ω impedance, SMA connectors, and module package). This ensures consistent performance in the original application. The primary difference lies in the frequency range: the SA3R-20 supports 0 Hz to 3 GHz, whereas the FMAT7620-20 extends to 0 Hz to 18 GHz. The substitute part therefore offers broader applicability in higher frequency bands while maintaining equivalent or better stability within the 3 GHz range—typically, a wider bandwidth design provides improved VSWR and accuracy margin at lower frequencies. The substitution not only meets all original requirements but also provides additional headroom for potential system frequency expansion, with no compatibility concerns or performance degradation.