1. TV50C260J-G Substitution Conclusion The TV50C260J-G is a viable replacement for the SMDLCE26-HR in terms of core electrical parameters and offers superior surge immunity. However, caution is advised for high-speed applications. Two key differences are noted: First, the clamping voltage is lower (42.1V vs. 43.1V). Under the same surge stress, the TV50C260J-G provides tighter voltage protection to downstream circuitry, which is a beneficial improvement. Second, the peak pulse current is significantly higher (119.95A vs. 71.3A), indicating a greater capability to safely dissipate surge energy. This results in better robustness against high-current transients and effectively higher power handling compared to the original part. One critical parameter—junction capacitance—is not provided in its datasheet. If intended for protecting high-speed data lines or RF circuits, the capacitance must be measured or confirmed with the manufacturer to ensure it is comparable to that of the original part (50pF Max). This step is essential to prevent potential signal integrity degradation.