Original Part
Alternative Part
1. SA18S5W-06 Substitution Conclusion
Direct substitution is fully viable. The SA18S5W-06 exhibits identical core technical specifications to the original FMAT7623-6, including attenuation value (6 dB), frequency range (0–18 GHz), power handling capacity (5W), and impedance (50 Ω). The mechanical package is also the same, utilizing an SMA straight plug module. Minor textual differences in the part descriptions, such as “FXD ATTN PLUG-JACK,” typically reflect manufacturer‑internal product series naming conventions and do not indicate any change in technical performance. Consequently, the SA18S5W-06 can be regarded as an electrically equivalent substitute for the original part in terms of RF performance, power handling, and frequency response.
2. SA3S5W-06 Substitution Conclusion
Direct substitution is not recommended; a strict assessment of the system frequency requirements is essential. The SA3S5W-06 differs from the original part in its frequency range, which is limited to 0–3 GHz—significantly lower than the original’s 18 GHz upper limit. If deployed in circuits operating above 3 GHz, key performance parameters such as attenuation accuracy, impedance matching, and VSWR will degrade severely. This can lead to signal distortion, increased reflections, potential damage to preceding stages, or failure to meet system performance specifications. Substitution should only be considered if it is confirmed that the entire system and application scenario operate consistently at or below 3 GHz.
Analysis ID: 5164-B054000
Based on part parameters and for reference only. Not to be used for procurement or production.
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