SA18H-12 Replacement: SA6H-12, FMAT1014

Original Part

SA18H-12

Fairview Microwave

RF Attenuators 12dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

SA6H-12

Fairview Microwave

RF Attenuators 12dB 0 Hz ~ 6 GHz 50 Ohms 2W SMA In-Line Module

FMAT1014

Fairview Microwave

RF Attenuators 12dB 0 Hz ~ 6 GHz 50 Ohms 2W SMA In-Line Module

1. SA6H-12 Substitution Conclusion The SA6H-12 matches the original SA18H-12 in attenuation value, power handling, impedance, and package form factor. However, its frequency range is limited to 0–6 GHz, whereas the SA18H-12 supports operation up to 18 GHz. In applications above 6 GHz, the SA6H-12 may not maintain its specified attenuation accuracy and could exhibit performance degradation. Therefore, it is only suitable as a direct replacement in systems operating at or below 6 GHz. Substitution is not recommended if the original application involves higher frequency bands.

2. FMAT1014 Substitution Conclusion The key differences between the FMAT1014 and the SA18H-12 are twofold: first, its frequency range is also limited to 0–6 GHz (compared to 18 GHz for the SA18H-12); second, there may be slight mechanical dimensional variations—specifically, its height is noted as 1.22 inches versus 1.35 inches for the original part. The FMAT1014 is only viable for low‑frequency replacement and requires verification of mounting space and connector compatibility. Substitution is not feasible if the system operates above 6 GHz or if the mechanical layout is sensitive to dimensional tolerances.

Analysis ID: A1E8-5BFA000

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