1. FMAT7620-10 Substitution Conclusion The FMAT7620-10 is electrically identical to the original SA18SS-10 in all key performance parameters, including attenuation (10 dB), frequency range (0 Hz to 18 GHz), power rating (2 W), impedance (50 Ω), and package type (SMA In-Line Module). From an RF performance standpoint, it is therefore a viable substitute. The difference lies in the connector type: the SA18SS-10 uses an SSMA (Sub-SubMiniature version A) connector, while the FMAT7620-10 employs a standard SMA male connector. These two are physically incompatible—the SSMA is smaller and has a different pin configuration. Direct substitution could prevent connection to existing cables or equipment. In practice, this means an SSMA‑to‑SMA adapter would be required, or system‑level connector compatibility must be evaluated. Without addressing the mechanical interface, the substitution is limited by physical installation feasibility.