1.1.5SMC13A-E Substitution Conclusion A detailed comparison confirms that the 1.5SMC13A-E is a fully qualified substitute for the original part (Panjit's 1.5SMC13A_R1_00001). The two TVS diodes share identical core electrical parameters: an 11.1V reverse standoff voltage, a 12.4V minimum breakdown voltage, an 18.2V maximum clamping voltage, and a 1500W peak pulse power rating. This ensures their protection thresholds and energy absorption capabilities are exactly the same in-circuit. The only deviation is in the peak pulse current (Ipp). The Littelfuse part is rated for 83.5A, slightly higher than the original's 82A. This gives the 1.5SMC13A-E a marginally greater current margin when subjected to the same standard surge event. This constitutes a positive enhancement with no adverse effect on the circuit protection performance. Furthermore, both devices utilize the standard DO-214AB (SMC) package and are pin-for-pin compatible, allowing for direct replacement. Based on electrical performance, package form, and function, this substitution is completely feasible and equivalent.