FMAT7623-2 Replacement: SA3S5W-02, SA18S5W-02

Original Part

FMAT7623-2

Fairview Microwave

RF Attenuators 2dB 0 Hz ~ 18 GHz 50 Ohms 5W SMA In-Line Module

Alternative Part

SA3S5W-02

Fairview Microwave

RF Attenuators 2dB 0 Hz ~ 3 GHz 50 Ohms 5W SMA In-Line Module

SA18S5W-02

Fairview Microwave

RF Attenuators 2dB 0 Hz ~ 18 GHz 50 Ohms 5W SMA In-Line Module

1. SA3S5W-02 Substitution Conclusion Direct substitution is not recommended. While the SA3S5W-02 matches the original FMAT7623-2 part in core parameters such as attenuation value, power rating, and impedance, its operational frequency range is limited to 0-3 GHz. This is significantly narrower than the original's 0-18 GHz range. In applications exceeding 3 GHz—such as in the C, X, or Ku microwave bands—this attenuator cannot guarantee its nominal 2dB attenuation accuracy or proper impedance matching. This may lead to signal distortion, increased reflections, and a substantial degradation in high-frequency circuit performance and measurement accuracy. Therefore, it is only suitable for low-frequency applications below 3 GHz.

2. SA18S5W-02 Substitution Conclusion Complete substitution is acceptable. The SA18S5W-02 is fully equivalent to the original FMAT7623-2 in all key electrical specifications. This includes the 2dB attenuation, 5W power handling, 50-ohm impedance, and the critical full frequency range of 0-18 GHz. Mechanically, both are SMA male-to-female inline modules, ensuring physical installation compatibility. The SA18S5W-02 provides identical attenuation performance, power handling, and impedance matching characteristics as the original part across the entire DC to 18 GHz spectrum, making it an ideal drop-in replacement.

Analysis ID: DD16-A12B000

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