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CSD15380F3: 2oz copper recommendation

Ben holter
Intellectual 255 points
Part Number: CSD15380F3
Other Parts Discussed in Thread: CSD15571Q2

I see that this part is not recommended to be used with copper greater than 1oz. Is there a similar fet (with very low leakage) which can handle 2oz?

  • 0
    TI__Mastermind 31285 points

    Hello Ben,

    Thanks for your interest in TI FETs. PCB Copper thickness is directly related to aspect ratio that affect the pad size. The thicker the copper, the larger PCB pad has to be. So for for this FemtoFET with small pad, the PCB copper thickness will be limited to 1 oz. Below is a link to the FemtoFET SMT guidelines.

    https://www.ti.com/lit/ug/slra003d/slra003d.pdf

    TI has alternative devices in 2x2mm SON package: CSD15571Q2 or CSD71571Q2. Please let me know if I can be of further assistance.

    Best Regards,

    John Wallace

    TI FET Applications

  • 0 in reply to John Wallace1
    TI__Mastermind 31285 points

    Hi Ben,

    Following up to see if your issue has been resolved. Please let me know if I can be of further assistance.

    Best Regards,

    John

  • 0 in reply to John Wallace1
    Intellectual 255 points

    Reading into this further, as long as we have a proper solder mask boundary on these femtofets, we can use 2oz copper. Is this correct? 

  • 0 in reply to Ben holter
    TI__Mastermind 31285 points

    Hi Ben,

    I shared your question with our SMT expert. His feedback is given below. We'd be more than happy to review your pad design and PCB layout.

    It is possible to layout a PCB with 2 oz copper having PCB pad metal size according to aspect ratio. Then use solder mask to control the soldering pad dimension.

    The metal pad probably would have an offset position to maintain the minimum spacing between the pads.

    This is a small footprint device with small pad. The layout would be a little challenge.

    Best Regards,

    John

  • +1 in reply to John Wallace1
    TI__Mastermind 31285 points

    Hi Ben,

    Please let me know if this resolved your issue. As I stated in my previous response, we're happy to review your pad design and PCB layout. Feel free to contact me if you need further assistance. For now, I'm going to close this thread. You can reopen it or start a new thread at any time.

    Best Regards,

    John