SA3R-10 Replacement: M3933/30-21S, 32AS102-K10S3

Original Part

SA3R-10

Fairview Microwave

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

Alternative Part

M3933/30-21S

Amphenol SV Microwave

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

32AS102-K10S3

Rosenberger

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

1. M3933/30-21S Substitution Conclusion From the perspective of core electrical parameters and mechanical interfaces, the M3933/30-21S is a fully qualified substitute for the original SA3R-10 part. Its attenuation value (10dB), impedance (50Ω), power rating (2W), and interface type (SMA In-Line Module) are identical to the original, ensuring direct compatibility for basic functionality. The key difference lies in the frequency range: the M3933/30-21S supports DC to 32 GHz, far exceeding the original part's 3 GHz upper limit. This part offers superior and flatter attenuation performance over this ultra-wide bandwidth, making it suitable for higher-frequency applications. Its internal design and construction—likely featuring more precise resistor materials and structures—are typically more refined, providing greater overall performance margin. Furthermore, its manufacturer, Amphenol SV Microwave, and the implied MIL-PRF-3933 standard (inferred from the part number prefix) represent higher standards for reliability and environmental robustness, offering distinct advantages in demanding applications.

2. 32AS102-K10S3 Substitution Conclusion The 32AS102-K10S3 is also a functionally acceptable substitute for the SA3R-10, with critical parameters such as attenuation, impedance, power rating, and interface being a complete match. Similar to the other substitute, its primary deviation from the original part is in the frequency range, supporting DC to 18 GHz, which is significantly wider than the original's 3 GHz. This attenuator maintains specified attenuation accuracy and port matching up to 18 GHz, offering superior high-frequency performance compared to the original and providing the system with wider bandwidth adaptability margin. While its upper frequency limit does not reach that of the M3933/30-21S, it already represents performance overkill for applications originally designed below 3 GHz. Manufactured by Rosenberger, a reputable producer of connectors and microwave components, it is a quality-assured, reliable alternative that delivers enhanced performance.

Analysis ID: 6E93-846C000

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