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November 2005

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TechNet E-Mail Forum <[log in to unmask]>, Babcock John <[log in to unmask]>
Date:
Thu, 10 Nov 2005 17:13:55 -0500
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TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
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Bev Christian <[log in to unmask]>
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John,
You call HASL smooth?!  It certainly isn't flat by any stretch of the
imagination.  Anything is flatter than HASL.

The only time I have seen a smoothness spec (well roughness spec) for a
board surface finish was when I was at Nortel and there was a daughter
board that was going to be pushed in and out of a connector several
times over its lifetime and there some concern that a rough gold finish
could wear away the contact surface in the connector.

1) No you cannot HASL with Silver.  Silver melts at 961.78C.  This is a
tad hot for the board epoxy.

2) See second paragraph.

Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Babcock John
Sent: November 10, 2005 4:09 PM
To: [log in to unmask]
Subject: [TN] plating smoothness

Does anybody call out a specific smoothness finish ever on a fabrication
dwg for the HASL?  In these days of lead free, going forawrd, I am
wondering if silver will have the same smoothness finish as SN63/PB37
using HASL?
 
1)  Or can you HASL with silver?
 
2)  Does anyone have an example of a fab note for such a callout?  Or is
this getting too specific?
 
John Babcock
PCB Designer III
Isothermal Systems Research (ISR)
2218 N. Molter Rd
Liberty Lake, WA 99019
[log in to unmask]
P: (509) 241-4641
F: (509) 444-1082
 
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