M3933/30-19N Replacement: SA18H-09, FMAT1013

Original Part

M3933/30-19N

Amphenol SV Microwave

RF Attenuators 9dB 0 Hz ~ 32 GHz 50 Ohms 2W SMA In-Line Module

Alternative Part

SA18H-09

Fairview Microwave

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

FMAT1013

Fairview Microwave

RF Attenuators 9dB 0 Hz ~ 6 GHz 50 Ohms 2W SMA In-Line Module

1. SA18H-09 Substitution Conclusion The SA18H-09 matches the original part exactly in attenuation value, power rating, impedance, and connector type. However, its frequency range (0–18 GHz) is significantly narrower than the original’s 0–32 GHz specification. If the application frequency exceeds 18 GHz—such as in the Ka‑band or millimeter‑wave bands—this attenuator cannot guarantee the nominal 9 dB attenuation accuracy or proper impedance matching. This may lead to signal distortion or degraded system performance. The SA18H-09 can serve as a direct replacement only when the operating frequency is confirmed to remain below 18 GHz; otherwise, it is not a viable substitute.

2. FMAT1013 Substitution Conclusion The FMAT1013 matches the original part in attenuation, power handling, and impedance. However, its frequency range (0–6 GHz) is far below the original’s upper limit of 32 GHz. This device is only suitable for low‑frequency applications up to the UHF and C‑bands. If used at higher frequencies—such as X‑, Ku‑, or Ka‑bands—its key parameters, including attenuation accuracy and VSWR, will degrade severely and fail to meet design requirements. Unless the application is strictly limited to frequencies below 6 GHz, the FMAT1013 is not a feasible substitute.

Analysis ID: 8FA5-77E3000

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