1. FMAT7620-20 Substitution Conclusion The FMAT7620-20 can serve as a complete drop-in replacement for the original Rosenberger 32AS102-K20S3 in terms of core electrical performance and mechanical interface. All key specifications—including 20 dB attenuation, 0–18 GHz frequency range, 50 Ω impedance, 2 W power handling, and SMA through-hole package—are identical. This ensures that the substitute can be directly interchanged in most RF links without any degradation in signal processing performance. The primary technical differences likely lie in unspecified “Grade” and “Qualification” details. The Fairview Microwave part does not provide such information, whereas Rosenberger’s original product may inherently comply with more stringent reliability standards or carry specific industry certifications (e.g., military or aerospace grade). If your application imposes strict requirements on long-term reliability, environmental robustness (such as extreme temperature or vibration tolerance), or mandatory industry qualifications, it is advisable to verify whether the FMAT7620-20 meets those specific standards. For general commercial, industrial, or laboratory applications, however, this part represents a viable alternative.