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CSD17579Q5A: Issue with Net Connection in Altium

Ava Snelling
Prodigy 30 points

Part Number: CSD17579Q5A
Other Parts Discussed in Thread: CSD18514Q5A

Screenshot 2026-01-23 211004.png

Hello, I am running into an issue where the drain of the MOSFET won't connect to its net with a polgon pour, only a trace. This is what the image is showing. For some reason, there appears to be a keep out around the drain pad, but I can connect them with a trace. Any ideas on how to fix this? Thank you!

  • 0
    TI__Mastermind 40580 points

    Hello Ava,

    Thanks for the inquiry. I am unsure why you are having this issue with the Altium footprint. Let me check with the CAD team to see if they know why this is happening. I will update you as soon as I have more information.

    Best Regards,

    John Wallace

    TI FET Applications

  • 0 in reply to John Wallace1
    TI__Mastermind 40580 points

    Hi Ava,

    Thanks again for your interest in TI FETs. I checked with the CAD team and this footprint was created several years ago, They are going to create a new footprint but it may take some time to complete. In the meantime, the CSD18514Q5A is in the same package and the footprint has been recently updated. Can you try that as a placeholder in your design until the CSD17579Q5A footprint is updated? Please let me know.

    Thanks,

    John

  • 0 in reply to John Wallace1
    TI__Mastermind 40580 points

    Hi Ava,

    The new version of the PCB footprint has been created, reviewed and approved. It may take a few days before it is updated on TI.com. Below are some helpful hints and screen shots from our CAD team. Also, attached is a sample PCB project. Let me know if you still have issues.

    Thanks,

    John

    1) Design rules must be set accordingly: you must check the polygons connect style here:

    2) Particular drain polygon pour settings must be as following:

    2553.PCB_Project.zip