1.5KE100A-G Substitution Conclusion Substitution is acceptable, with a note on the slight reduction in peak pulse current capability. The 1.5KE100A-G is identical to the original part (1.5KE100A A0G) in all key protection parameters—reverse standoff voltage (85.5V), breakdown voltage (95V), maximum clamping voltage (137V)—as well as in rated power (1500W) and package (DO-201AA). The only difference lies in the peak pulse current: the original part is rated for 11.4A, while the 1.5KE100A-G is rated for 10.95A, representing a decrease of approximately 4%. When subjected to the same standard test waveform (10/1000µs), the Comchip device exhibits a marginally lower instantaneous current withstand capability. Consequently, its actual absorbable transient energy—which relates to the integral of clamping voltage and current—is theoretically slightly reduced. In the vast majority of non-extreme application scenarios, this minor deviation falls within typical engineering design margins. Therefore, the 1.5KE100A-G can serve as a functional direct replacement. 1.5KE100A-HF Substitution Conclusion Substitution is acceptable, and the conclusion is identical to that for the 1.5KE100A-G. Based on the provided parameters, the 1.5KE100A-HF matches the 1.5KE100A-G in all critical electrical specifications—including reverse standoff voltage, clamping voltage, peak pulse current (10.95A), and power rating—as well as in physical package. The distinction from the original part is likewise confined to the peak pulse current (10.95A vs. 11.4A). The "-HF" suffix typically denotes "halogen-free" or certain manufacturing process variations, but no functional differences are indicated in the given core performance parameter table. Its suitability as a replacement is the same as described for the 1.5KE100A-G above. It can be used to replace the original part, with the same consideration given to its slightly lower peak current capability.