M3933/30-03N Replacement: LCAT1002-01, FMAT7620-1

Original Part

M3933/30-03N

Amphenol SV Microwave

RF Attenuators 1dB 0 Hz ~ 32 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

LCAT1002-01

L-com

RF Attenuators 1dB 0 Hz ~ 3 GHz 50 Ohms 2W SMA In-Line Module

FMAT7620-1

Fairview Microwave

RF Attenuators 1dB 0 Hz ~ 18 GHz 50 Ohms 2W SMA In-Line Module

1. LCAT1002-01 Substitution Conclusion Not feasible. The discrepancy lies in its frequency range (DC–3 GHz), which is significantly narrower than that of the original part (DC–32 GHz). In the frequency band from 3 GHz to 32 GHz, this part cannot guarantee the specified attenuation accuracy, impedance matching, or power handling capability. This would result in severe signal distortion, increased reflection (degraded VSWR), and potential damage to preceding and subsequent circuit stages. Consequently, it is only suitable for low‑frequency applications below 3 GHz and cannot serve as a full‑band replacement.

2. FMAT7620-1 Substitution Conclusion Conditionally feasible. The difference is that its frequency range (DC–18 GHz), while better than the previous part, still does not fully cover the upper limit of the original part (DC–32 GHz). For systems operating in the 18 GHz to 32 GHz band, this part is not applicable. However, for applications with operating frequencies below 18 GHz, it matches the core parameters (attenuation value, power rating, impedance) and can be considered a direct substitute. Prior to substitution, it is essential to verify that the actual system’s maximum operating frequency is below 18 GHz. Additionally, it is recommended to perform actual measurements of its high‑frequency performance (e.g., VSWR, attenuation flatness) in critical applications to ensure full compliance with requirements.

Analysis ID: 24E7-6BA5000

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