Original Part
Alternative Part
1. SA3N5W-03 Substitution Conclusion
Substitution is not recommended. While the SA3N5W-03 matches the original part (FMAT7624-3) in attenuation value, power handling, and connector interface, a critical discrepancy exists in its operational frequency range. The SA3N5W-03 is limited to 0-3 GHz, whereas the original component supports an ultra-wideband of 0-18 GHz. Consequently, the SA3N5W-03 can only provide the specified 3dB attenuation and proper impedance matching in low-frequency applications below 3 GHz, such as certain mobile communications and WLAN systems. If the system operates above 3 GHz—for instance, in C-band, Ku-band, or broadband testing scenarios—this part will become unusable due to severe performance degradation, including deviation from the nominal attenuation value and poor Voltage Standing Wave Ratio (VSWR). This would likely result in signal distortion, measurement inaccuracies, or system failure.
2. SA6N5WA-03 Substitution Conclusion
Conditional substitution, requiring rigorous evaluation. The SA6N5WA-03 is identical to the original part in attenuation, power rating, and interface. Its operational frequency range of 0-6 GHz, though an improvement over the SA3N5W-03, remains significantly narrower than the original's 18 GHz upper limit. Within the 0-6 GHz band—covering S-band and some C-band applications like Wi-Fi 6E and certain radar systems—this part functions correctly. However, for any application involving frequencies from 6 GHz to 18 GHz (common in satellite communications, high-speed test instrumentation, and military EW systems), this part will fail completely. Substitution is permissible only if it is definitively confirmed that the system's maximum operating frequency will never exceed 6 GHz. Otherwise, a full-bandwidth part must be selected.
Analysis ID: E637-255D000
Based on part parameters and for reference only. Not to be used for procurement or production.
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