1. SA6S10W-10 Substitution Conclusion Conditional substitution; rigorous evaluation required. The SA6S10W-10 matches the original part number in attenuation value, power rating, and impedance. However, a key difference is its operational frequency range, which is limited to 0–6 GHz, significantly lower than the original's 0–18 GHz range. When operating above 6 GHz, the performance of this attenuator—including its attenuation accuracy and VSWR—will degrade severely or even fail, potentially causing system signal distortion or excessive reflected power. This part can only be considered as a cost‑reduction or procurement‑ease alternative if it is confirmed that your application circuit's maximum operating frequency consistently remains below 6 GHz. Otherwise, it is not a suitable substitute.