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LM5111: Are NC pins true No Connects?

Mark Guastaferro
Genius 11645 points
Part Number: LM5111
Other Parts Discussed in Thread: UCC27624

Customer is looking to replace existing gate driver with LM5111-4, however existing device has Enables on pins 1 and 8.  These are pulled High on existing board.  

If pins  and 8 are true No-connects on the LM511-4 and there is no concern having a DC voltage on these pins,  then the device can drop in with no modification. 

  • 0
    TI__Expert 4070 points

    Hi Mark,

    Thanks for reaching out!

    -------

    I can double check on the No-Connect pins, but before I do, would the customer be interested in our brand new dual channel driver that is directly pin-to-pin?

    The part is our UCC27624; it is better in nearly every way and would be directly pin-to-pin (because it has the ENABLE pins).

    --------

    I am looking forward to your response!

    Thanks,

    Aaron Grgurich

  • 0
    TI__Genius 11645 points

    Hi Aaron,

    I will ask the customer, but I expect the reason they will want to stick to the LM5111 is because they have used it before and it is already in their component data base.  Using the UCC27624 (or almost any other option) would require them to generate internal documentation.  They may not have time for this right now due to short term needs on existing products (availability issues). 

  • 0 in reply to Mark Guastaferro
    TI__Expert 4070 points

    Hi Mark,

    Sounds good!  Hopefully they will look into the UCC27624, but no worries if they think about that later down the line!

    -------

    I just checked the wire bond diagram of the LM5111, and the NC pins are not connected to anything so there should be no issues applying a voltage to those pins!

    -------

    Thanks!

    Aaron Grgurich

  • 0 in reply to Aaron Grgurich
    TI__Genius 11645 points

    Aaron,

    Thanks for the confirmation on the LM5111-4.  I'm going to send you an email outside of the forum with some comments on the UCC27624 suggestion..