FMAT7623-1 Replacement: SA3S5W-01, SA18S5W-01

Original Part

FMAT7623-1

Fairview Microwave

RF Attenuators 1dB 0 Hz ~ 18 GHz 50 Ohms 5W SMA In-Line Module

Alternative Part

SA3S5W-01

Fairview Microwave

RF Attenuators 1dB 0 Hz ~ 3 GHz 50 Ohms 5W SMA In-Line Module

SA18S5W-01

Fairview Microwave

RF Attenuators 1dB 0 Hz ~ 18 GHz 50 Ohms 5W SMA In-Line Module

1. SA3S5W-01 Substitution Conclusion Direct substitution is not feasible. While the SA3S5W-01 matches the original part in attenuation value, power rating, impedance, and connector interface (SMA In-Line Module), a critical discrepancy exists in its frequency range. The SA3S5W-01 is specified only for 0-3 GHz, significantly narrower than the original part's 0-18 GHz range. Within the 3 GHz to 18 GHz operational band, key performance parameters—including attenuation accuracy, impedance matching, and power-handling capability—cannot be guaranteed. This may lead to signal distortion, increased reflection (degraded VSWR), or potential device failure. Consequently, this attenuator is suitable only for low-frequency applications below 3 GHz and cannot serve as a full-bandwidth replacement.

2. SA18S5W-01 Substitution Conclusion Direct substitution is acceptable. The SA18S5W-01 is fully equivalent to the original part FMAT7623-1 across all critical electrical specifications: 1 dB attenuation, 0-18 GHz bandwidth, 50-ohm impedance, and 5W power rating. The mechanical interface is also identical (SMA In-Line Module). This indicates no measurable difference in RF performance—such as frequency response flatness and power tolerance—or in mechanical compatibility. It can therefore be installed as a direct replacement without any impact on system performance or connection configuration.

Analysis ID: 4992-E9DD000

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