FMAT7611-12 Replacement: M3933/30-25S, SA18H-12

Original Part

FMAT7611-12

Fairview Microwave

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

Alternative Part

M3933/30-25S

Amphenol SV Microwave

RF Attenuators 12dB 0 Hz ~ 32 GHz 50 Ohms 2W SMA In-Line Module

SA18H-12

Fairview Microwave

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

1. M3933/30-25S Substitution Conclusion From a core electrical parameter perspective, the M3933/30-25S is a viable direct substitute, as it is identical to the original part in attenuation value, impedance, power handling, and interface type. The key difference lies in its extended frequency range of 0-32 GHz, which is significantly superior to the original part's 18 GHz upper limit. This part maintains its specified attenuation accuracy and matching performance up into the 32 GHz millimeter-wave band. Consequently, for applications within the common 18 GHz and lower range, it will deliver equivalent or potentially superior electrical performance. It is important to note that, as a military-grade component compliant with the MIL standard (M3933), it typically differs from commercial-grade originals in terms of cost, lead time, and potential minor dimensional tolerances. For high-performance or high-reliability applications where these factors are not critical, it represents an excellent upgrade alternative.

2. SA18H-12 Substitution Conclusion The SA18H-12 is technically suitable as a direct substitute. Its attenuation value, frequency range (0-18 GHz), power rating, impedance, and package form factor are identical to those of the original FMAT7611-12 part. In the vast majority of application scenarios, their electrical performance can be considered equivalent. The distinction is that the part number and its description suggest it likely belongs to a different product series from the same manufacturer (Fairview Microwave). This typically correlates with variations in internal design, production batches, or materials, yet the final performance specifications are aligned with the original part. Provided the mechanical dimensions and interface (SMA Male-to-Female) are confirmed to be identical, this part can be regarded as an in-brand, parameter-equivalent alternative, suitable for applications that do not mandate exact correspondence to the Original Part.

Analysis ID: CC28-A35B000

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