Christopher,
I'm not sure if there is an industry standard (from IPC or the like) on
HASL, but I'm sure you can get good information from the HASL User's Group.
Their web page is http://huggroup.org/

I have seen a spec from Teledyne Halco (manufacturer of HASL machines)
giving process guidelines that was pretty good.  I imagine you can find a
link to Halco from the HUG site.

You can pretty much spec whatever you like (and your supplier agrees they
can meet) on your fab drawings.  I'd be sure to spec both a max and min
thickness, and also define HOW thickness will be measured, as that leads to
another whole area of confusion.

Hal Winslow
Mfg Engineer
Lightchip Optical Networking

-----Original Message-----
From: Christopher Lampron [mailto:[log in to unmask]]
Sent: Thursday, October 18, 2001 6:02 AM
To: [log in to unmask]
Subject: [TN] HASL Plating Thickness


Hello All,

Is there any specification regarding the max thickness of HASL plated
PCB's. We have recently received a lot of boards where the HASL plating on
the fine pitch device exceeds 3.5 mils. He have an extensive amount of
bridging on these devices now. Any help would be greatly appreciated.

Thanks

Christopher Lampron

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