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July 2002

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Subject:	Re: 0603 LEGEND & REPORTED TOMB STONING
From:	Dom Bragge <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Tue, 2 Jul 2002 11:39:56 +1000
Content-Type:	text/plain
Parts/Attachments:	text/plain (53 lines)

Paul Noonan wrote:
>
> ...for legend to mark these 0603's instead of an ink box drawn around the component they used an ink dot or line drawn between the pads this then leaves more room for the Ref Des.

When I was designing for JNA Telecommunications here in Sydney, we did
two parallel ink lines for 0603s: they were like cap plates for
capacitors & 90degrees to that for resistors. We never had any
(reported) problems with tombstoning, although the assemblers were known
to touch up the occasional part (for unspecified reasons). This left a
lot more room for References.
Although the ink was notionally close to the pads, we never had problems
with ink on pads because if there ever was overlying ink, it gets nuked
during HASL (or equiv) board making process.

DISCLAIMER
I would ask your assemblers, not your board shop, as to their views.
Don't do what they don't want unless there is no choice.

 Capacitors
 +---+ |  | +---+
 |   | |  | |   |
 |   | |  | |   |
 +---+ |  | +---+

 Resistors
 +---+ ---- +---+
 |   |      |   |
 |   |      |   |
 +---+ ---- +---+

--
Dom Bragge CID          "The pink building"
Production Manager      Level 1, IBC Bldg
KLAXON IQA              Australian Technology Park
bh+61-2-9209-4404       Eveleigh 1430 NSW
fx+61-2-8374-5030       (Sydney, AUSTRALIA)
www.klaxoniqa.com

Directions to Klaxon IQA
http://www.whereis.com/search/email_map_redirect.jhtml?id=138778

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