SA3SR-10 Replacement: AT-110V, M3933/30-21N

Original Part

SA3SR-10

Fairview Microwave

RF Attenuators 10dB 0 Hz ~ 3 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

AT-110V

Hirose Electric Co Ltd

RF Attenuators 10dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

M3933/30-21N

Amphenol SV Microwave

RF Attenuators 10dB 0 Hz ~ 32 GHz 50 Ohms 2W SMA In-Line Module

1. AT-110V Substitution Conclusion From a core electrical parameter perspective, the AT-110V is identical to the original SA3SR-10 part in attenuation value (10dB), power handling capacity (2W), and impedance (50Ω). Its SMA feed-through module package also matches, providing the physical basis for substitution. The key difference lies in the frequency range: the AT-110V supports 0 Hz to 18 GHz, significantly wider than the original part's 0-3 GHz. For applications at or below the originally designed 3GHz band, the AT-110V will have substantial performance margin, typically resulting in superior in-band flatness and VSWR characteristics. Therefore, it is a viable and potentially superior substitute for applications within 3GHz. However, if intended for use in the higher frequency range (3-18GHz), additional validation is required to ensure its attenuation accuracy, power tolerance, temperature drift, and other parameters in this new interval meet system requirements.

2. M3933/30-21N Substitution Conclusion The M3933/30-21N also matches the original SA3SR-10 part in basic specifications (10dB attenuation, 2W power, 50Ω impedance, SMA feed-through package), meeting the hardware conditions for direct replacement. Its primary technical distinction from the original part is likewise a broader operational frequency range, extending from 0 Hz to 32 GHz. This part is designed for extreme broadband, high-frequency applications (e.g., microwave communications, test & measurement). Using it in the originally designed ≤3GHz applications generally represents downward compatibility with very high performance margins, making substitution theoretically feasible. Two critical points require attention: First, such a wideband component may exhibit superior specific performance metrics (e.g., attenuation accuracy, VSWR) below 3GHz compared to the original part. Second, it typically originates from military-grade suppliers like Amphenol SV Microwave, which may entail higher cost, different lead times, and potentially more stringent reliability standards (e.g., MIL specifications). These factors must be weighed against benefits in commercial, cost-sensitive projects.

Analysis ID: F1AA-2FF9000

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