Original Part
Alternative Part
1. SMCJ58AE3/TR13 Substitution Conclusion
From the perspective of core electrical performance, power rating, and package, the SMCJ58AE3/TR13 is a direct and viable substitute for the original part number MASMCJ58A/TR. Their key parameters, such as reverse standoff voltage (58V), maximum clamping voltage (93.6V @ Ipp), and peak pulse power (1500W), are identical. The primary difference is that the SMCJ58AE3/TR13 lacks the "Military" grade and "MIL-PRF-19500" qualification of the original part. This substitute is suitable for general industrial and commercial applications. However, it cannot be directly used in designs for military, aerospace, or other fields with specific military or high-reliability qualification requirements. For any certified replacement, appropriate compliance re-qualification is mandatory.
2. SMCJ58A-HRA Substitution Conclusion
The SMCJ58A-HRA, a Littelfuse product, is a viable second-source alternative, showing high compatibility with the original part in basic electrical parameters and package (DO-214AB). Its core specifications, including reverse standoff voltage, clamping voltage, and peak pulse power, are exactly the same as the original. A minor difference is its rated peak pulse current (Ipp) of 16.1A, which is slightly higher than the original's 16A. This results in a marginal surplus in surge withstand capability in practical applications, constituting a forward-compatible change that does not lead to performance degradation. The primary considerations for substitution are supply chain differences due to the manufacturer change and whether it has passed the customer's second-source qualification process. Electrically, it is a direct replacement.
Analysis ID: 3B6E-68AD000
Based on part parameters and for reference only. Not to be used for procurement or production.
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