M3933/30-03S Replacement: AT-101V, SA26B-01

Original Part

M3933/30-03S

Amphenol SV Microwave

RF Attenuators 1dB 0 Hz ~ 32 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

AT-101V

Hirose Electric Co Ltd

RF Attenuators 1dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

SA26B-01

Fairview Microwave

RF Attenuators 1dB 0 Hz ~ 26 GHz 50 Ohms 2W SMA In-Line Module

1. AT-101V Substitution Conclusion The feasibility of substituting AT-101V depends on the specific application frequency and is generally considered high-risk. The core difference from the original part (M3933/30-03S) lies in its maximum operating frequency, which is limited to 18 GHz—significantly lower than the original's 32 GHz. If your system operates above 18 GHz (e.g., in Ka-band or certain K-band applications), AT-101V cannot guarantee its specified attenuation accuracy, VSWR, or stability. This may lead to signal distortion and degraded system performance. Therefore, it is only suitable for non-critical applications at or below 18 GHz.

2. SA26B-01 Substitution Conclusion The substitution feasibility for SA26B-01 is relatively high, but it is still frequency-limited. The key difference is its maximum operating frequency of 26 GHz, which, while better than AT-101V, remains 6 GHz lower than the original part's 32 GHz. Within the 26 GHz to 32 GHz range—commonly used in satellite communications and high-end test and measurement applications—the performance of SA26B-01 will be inadequate. If your system's highest operating frequency does not exceed 26 GHz, SA26B-01 can serve as a direct replacement in terms of attenuation value, power handling, and interface form. However, it is not a viable substitute for frequencies above 26 GHz.

Analysis ID: 1F77-215F000

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