"It's the engineers and D-bug."
Sure the smaller parts and tighter spacing makes their job harder, and we
try to accommodate their needs.
But sometimes, in the words of the immortal bard, "You can't always get
what you waa-aant".
Smaller features in general are forcing changes, searchable PDF and
database viewers can be the way forward.
Regards,
Jeff Oliver
From: DesignerCouncil automatic digest system
<[log in to unmask]>
To: <[log in to unmask]>
Date: 03/27/2014 01:00 AM
Subject: DesignerCouncil Digest - 22 Mar 2014 to 26 Mar 2014
(#2014-18)
Sent by: DesignerCouncil <[log in to unmask]>
Date: Wed, 26 Mar 2014 16:09:34 -0700
From: David Baldwin <[log in to unmask]>
Subject: Re: Smallest Reasonable Ref. Des. Size?
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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