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MSP430F5419A: PCB design guide for 0.5mm package

ArTzy
Genius 15189 points
Part Number: MSP430F5419A

Hi Experts,

Good day.

From SPRABB3 document section 20 VIAS (page 15), it is suggested that a mechanical drill can be used to make a 10 mil via with 5 mil hole. Is this just for a via from outer layer to next layer down, or is this for a thru via? If for a thru via, what thickness PCB would this work with?

Query is raised by a customer. Thanks ahead for your support.

Regards,
Archie A.

  • 0
    TI__Guru 64646 points

    Hi Archie,

    A good question.  I'll have to dig into this one. 

  • 0 in reply to Dennis Lehman
    TI__Guru 64646 points

    Hi Archie,

    ArTzy said:
    From SPRABB3 document section 20 VIAS (page 15), it is suggested that a mechanical drill can be used to make a 10 mil via with 5 mil hole. Is this just for a via from outer layer to next layer down, or is this for a thru via?

    According to what I'm being told, the document does not make any distinction to the thru-hole, blind or buried, so the suggested specifications would apply to all.

    ArTzy said:
    If for a thru via, what thickness PCB would this work with?

    A thru-hole via has no PCB thickness limitation that I am aware of.  A thru-hole via is a ubiquitous on just about every PCB, regardless of the thickness or number of layers.  Did I misunderstand the question?

  • 0 in reply to Dennis Lehman
    TI__Genius 15189 points

    Hello Dennis,

    Thanks for your guidance.

    By any chance, do you know which PCB manufacturer in the world have you found that can drill a 10mil via pad with a 5mil drill, through any thickness PCB (typically around 64mil)?

    Regards,
    Archie A.

  • +1 in reply to ArTzy
    TI__Guru 64646 points

    Hi Archie,

    We have used 4PCB.com (U.S.)in the past for many of our prototypes and they have an extended capability to do really small diameter holes.  Attached is the list of capabilities.  They show they can do a pad size =  hole size + 6mils.  This would be a 11mil pad with 5mil hole.  From what I have read, they can do smaller hole sizes.  Best to call/email and ask.

    capabilities2018.pdf

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