2. SA3N5W-03 Substitution Conclusion This part is not a direct drop-in replacement and constitutes a downgrade; its use requires strict evaluation. The SA3N5W-03 differs from the original SA6N5W-03 in that its frequency range is limited to 0-3 GHz—only half of the original's 6 GHz upper limit. If the original circuit operates at frequencies or generates signal harmonics above 3 GHz, this attenuator cannot guarantee its specified attenuation accuracy and impedance matching characteristics. This could lead to degraded system performance, signal distortion, or measurement errors. Therefore, substitution should only be considered if it can be absolutely confirmed that the actual application frequency will never exceed 3 GHz; otherwise, significant application risk exists.