SA26B-09 Replacement: AT-109V, M3933/25-35S

Original Part

SA26B-09

Fairview Microwave

RF Attenuators 9dB 0 Hz ~ 26 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

AT-109V

Hirose Electric Co Ltd

RF Attenuators 9dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

M3933/25-35S

Amphenol SV Microwave

RF Attenuators 9dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

1. AT-109V Substitution Conclusion The AT-109V is a direct drop-in replacement for the original SA26B-09, with identical core electrical specifications (9 dB attenuation, 50 Ω impedance, 2W power rating) and mechanical interface (SMA In-Line Module). The key difference lies in the operational frequency range: the AT-109V covers 0–18 GHz, whereas the original part is rated for 0–26 GHz. For applications operating within 18 GHz, the AT-109V is a fully equivalent substitute with no performance degradation. However, if the application involves the 18–26 GHz band, the AT-109V is not suitable. In this higher frequency range, its attenuation accuracy, VSWR, and other parameters may degrade and fail to meet system requirements.

2. M3933/25-35S Substitution Conclusion The M3933/25-35S matches the original SA26B-09 in key specifications—including attenuation value, impedance, power rating, and connector type—making it a feasible direct replacement for applications below 18 GHz. The primary deviation from the original part is again the frequency ceiling: the M3933/25-35S supports 0–18 GHz, while the original part extends to 26 GHz. This substitute is therefore only applicable in scenarios where the operating frequency does not exceed 18 GHz. For broadband or high-frequency systems requiring coverage up to 26 GHz, the M3933/25-35S cannot be used as a replacement due to its insufficient frequency range, which would lead to out-of-spec performance.

Analysis ID: 3AE4-D4A4000

Based on part parameters and for reference only. Not to be used for procurement or production.