SA18N5WA-03 Replacement: 53AS105-K03N3, FMAT7461-3

Original Part

SA18N5WA-03

Fairview Microwave

RF Attenuators 3dB 0 Hz ~ 18 GHz 50 Ohms 5W N-Type In-Line Module

Alternative Part

53AS105-K03N3

Rosenberger

RF Attenuators 3dB 0 Hz ~ 10 GHz 50 Ohms 5W N-Type In-Line Module

FMAT7461-3

Fairview Microwave

RF Attenuators 3dB 0 Hz ~ 12.4 GHz 50 Ohms 5W N-Type In-Line Module

1. 53AS105-K03N3 Substitution Conclusion Direct substitution is not recommended. The key difference between this part and the original (SA18N5WA-03) lies in its frequency range, which is limited to 0–10 GHz, whereas the original covers 0–18 GHz. If the application involves frequencies above 10 GHz—such as in Ku-band satellite communications or high‑frequency test systems—using this substitute may lead to abnormal signal attenuation or degraded performance. Although both parts share identical attenuation values, power handling, and connector types, the restricted bandwidth limits its suitability to low‑frequency applications only, introducing risk in high‑frequency scenarios.

2. FMAT7461-3 Substitution Conclusion Conditional substitution is acceptable. This part operates from 0 to 12.4 GHz, which remains below the original’s 18 GHz range but still covers most common wireless communication and test bands (e.g., S‑band, C‑band, and portions of X‑band). Provided the actual operating frequency does not exceed 12.4 GHz, it meets the requirements for power, impedance, and connector compatibility. However, it cannot be used within the 12.4–18 GHz range—such as in certain radar or high‑speed data‑link applications—so the system’s maximum operating frequency must be verified prior to substitution.

Analysis ID: 3829-2937000

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