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ULN2803C: Implementation of ULN2803C(20pin) on land for ULN2803A(18pin).

Kengo.Y
Guru 10385 points
Part Number: ULN2803C

Hi team,

I would implement that on the same land as ULN2803A.
I think the ULN2803C additions need to be not connected as it is NC pins.

Is it possible to implement?
I'd like to implement ULN2803C without changing the board as ULN2803A becomes EOL.

I refered to the bellow E2E.
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1134115/faq-uln2803c-uln2803adwr-uln2803cdwr-creating-a-common-pcb-footprint-for-18-pin-and-20-pin-8ch-darlington-transistor-arrays-devices



Sincerely.
Kengo.

  • 0
    TI__Genius 14130 points

    Hi Kengo, 

    To clarify, are you hoping to place the ULN2803C onto a ULN2803A design without making any changes due to the bottom two pads being NC? 

    We would not recommend this as it could have long term reliability effects. We always recommend having all of the pins connected to a landing pad to ensure the device's stability and placement. 

    Best Regards, 

    Elizabeth 

  • 0 in reply to Elizabeth Higgins
    Guru 10385 points

    Hi Elizabeth,

    Thank you for your reply.

    Yes, we do not want to change the pattern.
    What exactly does long term reliability mean?

    Sincerely.
    Kengo.

  • +1 in reply to Kengo.Y
    TI__Genius 14130 points

    Hi Kengo, 

    Essentially the device would not have as stable of a placement as we recommend due to two of the pins not being soldered down to a pad. 

    There could be an issue with the device not being level due to a difference in height from pins soldered to a landing pad and those pins not soldered to a landing pan, but this is not something we test for. 

    Technically, the bottom two pins do not need to be connected to any voltage signal, but we will always recommend each pin be soldered to a pad. 

    Best Regards, 

    Elizabeth