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MCT8316A: Treatment of NC pins

Shinichi Inoue
Guru 20916 points
Part Number: MCT8316A

Dear Specialists,

My customer is designing the MCT8316A1V and has a question.

I would be grateful if you could advise.

---

I am designing a circuit for the MCT8316A1V and would like to know about the treatment of NC pins.

According to the datasheet P.8 Pin functions, pins 22, 23, 24, 25, and 39 are "NC" and "open"

On the other hand, on the MCT8316AEVM evaluation board, they are connected to GND (except pin 39).

Which connection is better?

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I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Expert 5577 points

    Hi Shinichi,

    Thanks for your question on the Motor Drives E2E Forum. 

    I will aim to provide an answer on this by early next week!

    Best,

    Robert

  • +1 in reply to Robert Wedan
    TI__Expert 5577 points

    Hi Shinichi,

    At a high level, it does not matter whether the NC pins are left floating or connected to GND.

    However, on the EVM it was decided that, to improve thermal performance and efficiency, we could connect the NC pins to the surrounding polygon pour. As seen in the EVM layout, not connecting these pins to GND may have led to the capacitor having only the single connection from pin 26 tying it to AGND instead of a whole pour around its footprint. 

    One way isn't necessarily better than the other but in the specific case of the EVM it made sense to connect the NC pins to GND. 

    I hope this answers your question. If it does please help by marking this thread as resolved!

    Best,

    Robert

  • 0 in reply to Robert Wedan
    Guru 20916 points

    Hi Robert,

    Thank you for your reply.

    I understand NC pin could connect both left open and GND.

    Regarding EVM, NC pins connected to GND to improve thermal performance and efficiency.

    I'll share this information with the customer.

    When they have an additional question, I consult you again.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi 

  • 0 in reply to Shinichi Inoue
    TI__Expert 5577 points

    No problem Shinichi.

    Could you please help others find this answer too by marking my answer above as "solved my issue"?

    Best,

    Robert

  • 0 in reply to Robert Wedan
    Guru 20916 points

    Hi Robert,

    The customer could understand.

    Let's close this thread.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi