2. 1.5SMC13A-E3/9AT Substitution Conclusion The core parameters of this part (Vishay) are largely consistent with the original part. However, its peak pulse current is slightly lower (82.4A vs. 83.5A), a difference of approximately 1.3%. All other specifications—voltage ratings, power rating, and package—remain the same. Substitution is acceptable in most application scenarios, as the current difference is minimal and remains within the same power rating class. The clamping voltage is unchanged, resulting in similar transient energy suppression capability. Nevertheless, if the design is highly sensitive to extreme current margin (e.g., for high-frequency, high-energy surge protection), the derated endurance should be validated.