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SM74611: Lifetim

Ray Vincent Aranzaso
Mastermind 18180 points
Part Number: SM74611


Hi,

Good Day. How long is the lifetime of SM74611? Customer product should work for 30 years, the diodes will be in a potting in a junction box. a Schottky diode lasts 30 years and I would like to compare the lifetime and durability of this component with a typical solution (Schottky diodes). Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Guru 57737 points

    Hi Ray,

    I need to check this with our internal quality team. Let me get back to you by mid-next week.

  • 0 in reply to Praveen GD
    TI__Guru 57737 points

    Hi Ray,

    Please refer to our terms of sale https://www.ti.com/legal/terms-conditions/terms-of-sale.html 

    8. Warranties and Related Remedies.

    8.1 Subject to Sections 8.2 through 8.4, 9 and 11 below, TI warrants to Buyer that each (i) Product conforms to TI’s published Specifications for such Product for a period of twelve (12) months after the date TI or a TI-authorized distributor delivers such Product, (ii) Wafer Product and Die Product conforms to TI’s published Specifications for such products for a period of thirty (30) days after the date TI or a TI-authorized distributor delivers such product and (iii) Evaluation Kit will be free of defects in material and workmanship for a period of ninety (90) days after the date TI or a TI-authorized distributor delivers such product.

  • 0
    Prodigy 50 points

    1. Is the 74611 considered as a means of cost reduction? Performance improvement? What are the projected savings from the improved performance, if any? 

    2. How expensive will the field failures be?

    3. Is the customer in possession of reliability data for the existing discrete design (if there is such)?

    4. What data does the customer use in assigning the lifetime and durability to the discrete diode solution (to compare it fairly with an integrated solution)?

    By smell test alone, there is an unsaid assumption that power Schottky diodes are inherently long-life devices. I’d hope that when applied properly they certainly would be, but… Solar panels are a particularly hard operating environment due to heat, marginal part ratings stemming from cost reductions in the BOM, and extreme levels of mechanical stress - especially when the mechanical design of the potted assembly is devoid of an engineered stress relief path  If the approach is “pot it and forget it”, without much thought to mechanical design, then anything integrated on the die will have easier time than discretes from mechanical stress alone.

    Specific gotchas: If there is good field data for the performance and associated repair/support costs of the diode-using solution, and if the potential costs of failure are high, then there would need to be a field experience available with the 74611 part, and it’d need to be as extensive as the one for the diode solution. Otherwise, there is no case to be made that 74611 will be cheaper *or* more expensive/less reliable  

    On the other hand: if there is no hard data to support either choice, then the “presumed superiority” of a discrete solution is a conjecture and has to be treated as such, especially that the integrated smart diode has less thermal stress than a discrete Schottky. But then, the smart diode has at most 10 years’ worth of reliability data available vs. decades for various standard power Schottky type discretes. Some of that data would have to come from the field of potted solar panel assemblies, since they are their own nasty environment with specific failure modes.