1. FMAT7620-1 Substitution Conclusion The FMAT7620-1 is fully consistent with the original AT-101V part in key electrical parameters (1 dB attenuation, 0–18 GHz frequency range, 50 Ω impedance, 2 W power handling) and mechanical package (SMA In‑Line Module), demonstrating technical feasibility for direct substitution. The differences lie in the manufacturer (Fairview Microwave instead of Hirose), which may result in minor variations in internal process, material selection, and test standards; however, these typically do not affect performance in general commercial‑grade applications. Additionally, the Fairview part does not specify Grade or Qualification markings. If the original application involves high‑reliability or specific industry standards (e.g., military, aerospace), further verification of its detailed specifications is recommended to ensure compliance. Overall, for general RF attenuation requirements in signal chains, the FMAT7620‑1 can be considered a functionally equivalent alternative.