SA18E-09 Replacement: FMAT7466-9, SA26B-09

Original Part

SA18E-09

Fairview Microwave

RF Attenuators 9dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

FMAT7466-9

Fairview Microwave

RF Attenuators 9dB 0 Hz ~ 12 GHz 50 Ohms 2W SMA In-Line Module

SA26B-09

Fairview Microwave

RF Attenuators 9dB 0 Hz ~ 26 GHz 50 Ohms 2W SMA In-Line Module

1. FMAT7466-9 Substitution Conclusion The FMAT7466-9 matches the original SA18E-09 in key parameters such as attenuation, power handling, and impedance. It can therefore serve as a direct substitute in mid- to low-frequency applications up to 12 GHz. The primary difference lies in its narrower frequency range (0 Hz to 12 GHz, compared to 0 Hz to 18 GHz for the SA18E-09). Above 12 GHz and up to 18 GHz, the FMAT7466-9 may fail to maintain expected performance, potentially introducing additional insertion loss or impedance mismatch, which could degrade signal integrity or reduce system efficiency. Consequently, substitution with the FMAT7466-9 is not recommended for applications operating above 12 GHz. For lower-frequency or narrowband systems, however, it remains a safe and acceptable replacement.

2. SA26B-09 Substitution Conclusion The SA26B-09 aligns with the original SA18E-09 in attenuation, power rating, and impedance. It also offers a wider frequency range (0 Hz to 26 GHz vs. 0 Hz to 18 GHz for the SA18E-09), making it fully compatible up to 18 GHz and potentially providing superior high-frequency performance. Technically, it can replace the original part without modification. Notable differences include the extended frequency range and possible slight physical dimension variations (labeled as SMA SS 1.4 compared to SMA SS 1.35 for the original, which may involve minor adjustments in height or length). The broader frequency coverage allows the SA26B-09 to support a wider array of applications, such as high-frequency testing or communication systems, without performance compromise. The dimensional difference should be checked against available mounting space and connector compatibility, though it generally does not affect electrical functionality. Overall, the SA26B-09 is a viable substitute, particularly suitable for scenarios requiring future frequency expansion or additional high-frequency margin.

Analysis ID: 7EF0-D951000

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