FMAT7620-1 Replacement: M3933/30-03S, SA26B-01

Original Part

FMAT7620-1

Fairview Microwave

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

Alternative Part

M3933/30-03S

Amphenol SV Microwave

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

SA26B-01

Fairview Microwave

RF Attenuators 1dB 0 Hz ~ 26 GHz 50 Ohms 2W SMA In-Line Module

1. M3933/30-03S Substitution Conclusion From a core electrical parameter standpoint, the M3933/30-03S is identical to the original FMAT7620-1 part in attenuation (1dB), power handling (2W), and impedance (50Ω), establishing the fundamental conditions for direct substitution. The key difference lies in the frequency range: the original part supports 0-18 GHz, whereas the M3933/30-03S extends to 0-32 GHz. The substitute part maintains performance above 18 GHz. For applications not exceeding 18 GHz, the substitution will result in fully matched electrical characteristics and may provide additional frequency headroom. If the application involves the 18-32 GHz band, the substitute can extend the system's operational range, provided the connectors (SMA) and other system components are compatible at these frequencies. In summary, this substitution is entirely feasible electrically and may enhance the system's high-frequency potential.

2. SA26B-01 Substitution Conclusion The SA26B-01 matches the original FMAT7620-1 part in critical parameters—attenuation, power handling, and impedance—and is also a Fairview Microwave product. This brand consistency is beneficial for maintaining quality and interface characteristics. The difference, again, is in the frequency range: the SA26B-01 supports 0-26 GHz, superior to the original part's 0-18 GHz. Within the 0-18 GHz band, their performance is equivalent, and substitution will not introduce electrical deviations. In the 18-26 GHz range, the substitute part functions correctly, whereas the original part may suffer from reduced attenuation accuracy or failure due to bandwidth limitations. For systems operating within 26 GHz, this substitute not only fully meets the original requirements but also provides wider bandwidth redundancy. The substitution is highly feasible and offers the added advantage of brand uniformity.

Analysis ID: F539-627E000

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