SA3R-03 Replacement: SA18SS-03, FMAT7467-3

Original Part

SA3R-03

Fairview Microwave

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

Alternative Part

SA18SS-03

Fairview Microwave

RF Attenuators 3dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

FMAT7467-3

Fairview Microwave

RF Attenuators 3dB 0 Hz ~ 12 GHz 50 Ohms 2W SMA In-Line Module

1. SA18SS-03 Substitution Conclusion The SA18SS-03 is identical to the original SA3R-03 in all key electrical specifications—attenuation (3dB), power rating (2W), and impedance (50Ω)—providing a theoretical basis for substitution. The differences lie in the operating frequency range (0–18 GHz for the SA18SS-03, significantly wider than the original’s 0–3 GHz) and the connector interface (SSMA versus SMA for the original). The broader frequency range of the SA18SS-03 ensures guaranteed performance up to 18 GHz and offers substantial performance margin in the original 3‑GHz band, effectively providing a "performance superset." While the SSMA connector is mechanically compatible with SMA (sharing the same thread), its smaller interface dimensions may introduce slight differences in mechanical tolerance and mating-cycle life when engaged with an original SMA female port. This should be validated in applications demanding high reliability or frequent connections. Electrically, the SA18SS-03 is a direct substitute with ample performance headroom. However, attention should be paid to the mechanical compatibility between SSMA and SMA interfaces; under non‑extreme mechanical stress, they are generally interchangeable.

2. FMAT7467-3 Substitution Conclusion The FMAT7467-3 also matches the original SA3R-03 in core electrical parameters. Its primary deviation from the original is the operating frequency range (0–12 GHz for the FMAT7467-3, wider than the original’s 0–3 GHz). The connector interface, however, is standard SMA (described as JACK‑PLUG, indicating a gender‑specific configuration but belonging to the same SMA series as the original). The extended 12‑GHz frequency range ensures excellent performance within the original 3‑GHz band with considerable design margin. Furthermore, the standard SMA interface guarantees full mechanical compatibility and interchangeability with the original, eliminating any connector‑adaptation concerns. Both electrically and mechanically, the FMAT7467-3 serves as a direct and ideal replacement for the original SA3R-03, offering a performance upgrade without compatibility risks.

Analysis ID: B401-0155000

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