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Original Part

Diode 400 V 3A Surface Mount DO-214AB (SMC)

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Alternative Part

Diode 400 V 3A Surface Mount DO-214AB (SMC)

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Substitution Feasibility Conclusion

In the vast majority of application scenarios, the MURS340HE3_A/I can directly replace the MURS340HE3_A/H, offering a significant cost advantage. Only in circuits that are extremely sensitive to switching efficiency or operate at very high frequencies (>100 kHz range) should the potential for additional losses introduced by the substitution be carefully evaluated.

Comparison Points

1. Reverse Recovery Time (trr): The A/H variant is rated at 50 ns, while the A/I is rated at 75 ns. This is the only substantive difference in electrical parameters between the two. A diode with a shorter trr transitions from the conducting state to full blocking and the ability to withstand reverse voltage more quickly. In high-frequency applications such as switching power supplies, trr directly impacts switching losses and electromagnetic interference (EMI). The A/H exhibits lower switching losses and slightly higher efficiency, making it particularly suitable for higher-frequency operation. The losses for the A/I are marginally higher, but this difference is typically negligible in medium-to-low frequency applications (e.g., tens of kHz). 2. Price: The A/I ($0.81) is approximately 25% lower in cost than the A/H ($1.08). Where the performance difference is acceptable, selecting the A/I enables a direct reduction in the bill-of-materials (BOM) cost. This is of considerable value for cost-sensitive or high-volume production projects. This price differential is likely a direct result of the chip fabrication process and its control over the trr specification.
Analysis ID: A6E0-9BB8000
Based on part parameters and for reference only. Not to be used for procurement or production.
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