1. AT-108V Substitution Conclusion The AT-108V is a viable substitute for the original M3933/30-17N in applications not exceeding 18 GHz, as it matches the core electrical parameters (8 dB attenuation, 50 Ω impedance, 2 W power handling) and mechanical interface (SMA In-Line Module). The key limitation is its maximum operating frequency of 18 GHz, significantly lower than the original part's 32 GHz. Consequently, it cannot be used in any high-frequency system operating between 18 GHz and 32 GHz, such as certain Ka-band satellite communications or high-end test and measurement equipment. Forcing a substitution in such cases would prevent proper signal attenuation within this band, introducing unpredictable insertion loss and reflections, thereby degrading system performance or causing outright failure. Additionally, while the manufacturer changes from Amphenol to Hirose—both reputable brands—the connector compatibility and long-term environmental reliability should be validated against the original design standards in the specific application.