1. LT5568EUFTRPBF Substitution Conclusion A comprehensive comparison confirms that the LT5568EUFTRPBF cannot serve as a direct substitute for the TRF370417IRGER. The core reason lies in a fundamental mismatch in operating frequency ranges: the TRF370417 covers an extremely wide band from 50 MHz to 6 GHz, whereas the LT5568 supports only a narrow band of 700 MHz to 1.05 GHz. Consequently, the LT5568 fails to meet the application requirements of the original part at lower frequencies (e.g., 50 MHz–700 MHz) or higher frequencies (e.g., >1.05 GHz). Furthermore, critical performance parameters reveal significant differences. The LT5568's 1 dB compression point (P1dB) is 8.3 dBm, notably lower than the original part's 12 dBm. This indicates weaker output linearity and power handling capability, making the LT5568 more susceptible to distortion under large-signal conditions. Additionally, its noise floor of -160.3 dBm/Hz is slightly higher than the TRF370417's -162 dBm/Hz, which may lead to a minor degradation in overall system noise performance. The difference in pin count and arrangement (16-WQFN vs. 24-VFQFN) also necessitates a complete PCB redesign. Substitution with the LT5568 could only be considered if the system is strictly confined to operation around 850 MHz, and if requirements for output power and linearity can be relaxed, provided the board is redesigned accordingly. Under all other conditions, this substitution is not viable.