1. FMAT7620-9 Substitution Conclusion The FMAT7620-9 can fully replace the original part LCAT1002-09 and offers performance advantages in certain high-frequency applications. The core parameters of both parts—attenuation value (9 dB), rated power (2 W), characteristic impedance (50 Ω), and interface type (SMA module)—are identical, ensuring direct compatibility in basic functionality. The difference lies in the frequency range: the original part covers DC to 3 GHz, while the FMAT7620-9 supports DC to 18 GHz. The substitute part maintains its nominal attenuation accuracy, impedance matching, and power handling capability up to 18 GHz, demonstrating superior high-frequency performance. For operation below 3 GHz, both parts perform equivalently; however, the FMAT7620-9 provides headroom for extension to higher frequencies, making it suitable for future system upgrades that may involve higher frequency bands. The substitution is not only feasible but also represents an upgrade in terms of bandwidth performance. Before implementation, it is recommended to verify full mechanical compatibility and evaluate any potential cost differences.