Hi, Mark,
It's up to the designers to spell that out, but I would say Yes, since it
could affect the overall height of the board once assembled - not by much,
I agree, and probably well within tolerance limits for the board anyway
most of the time. But if you regularly get boards near the upper thickness
limit, the HASL thickness may make the difference bettwen acceptance and
rejection, so you need to know. If in doubt, I would include the HASL
thickness.
Peter
Mark Hargreaves <[log in to unmask]> 23/01/2003 04:42 AM
Sent by: TechNet <[log in to unmask]>
Please respond to "TechNet E-Mail Forum."; Please respond to Mark
Hargreaves
To: [log in to unmask]
cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
Subject: [TN] Finished board thickness
Hi All,
Here's what was ordered:
0.062" finished board thickness, SMOBC, HASL final finish, IPC-6012 class
2.
Here's the question:
Does finished board thickness include the HASL coating thickness?
Thanks,
Mark Hargreaves
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