It's the engineers and D-bug. They want to see the ref des. I put
them on the assembly drawing only layer when they will not fit and
provide a searchable PDF assembly drawing, but they still want them
on the board (and not over vias). I do my best at 1.25mm height but
it's good to know that I can drop down to .1 if necessary. Again,
it's not for anyone but the engineers and d-bug, everything I do
pretty much needs to be assembled on the line, no hand assembly will do.
Thanks,
Dave
At 03:58 PM 3/26/2014, you wrote:
>I try to keep my minimum designator text at 1mm with a 0.2mm line
>thickness. That seems to be achievable & can still be read.
>Beyond that, I leave them off. Boards with small smd components are
>usually machine loaded anyway. I give priority to designators for
>connectors and major components.
>No point having the designators use up all the space you are saving
>by using the 0402s or 0201s. The rear side of my boards behind large
>BGAs tend to be a 'texture' of 0402 caps - no designators fit.
>regards,
>
>Phil Dutton C.I.D.+
>
>-----Original Message-----
>From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
>David Baldwin
>Sent: Thursday, 27 March 2014 3:30 AM
>To: [log in to unmask]
>Subject: [DC] Smallest Reasonable Ref. Des. Size?
>
>I am finding as I design tighter and tighter boards, especially with
>0201's, the ref des just no longer fit. I've been moving ref. des
>to the assembly layer and leaving them off of the PCB, and where I
>can, I run leader lines to their positions. I've been trying to
>stay with 1.25mm height with .125mm line width. I know it may vary
>between board shop capabilities, but what is the smallest reasonable ref.
>des. size that most shops can deal with today.
>
>Thanks,
>
>David Baldwin CID+
>
>
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