In what way is HAL different from HASL? Some use the difference to
distinguish between SnPb solder (HASL) and Pb-free solder (HAL). Solder
is the only finish that I am aware of that utilizes hot-air leveling for
creating a fairly flat finish anyway, so it appears your concern would
be whether the finish is SnPb or Pb-free Sn. Correct?
And to this, some component suppliers have been providing tin-only
finish on parts for years, most notably smd capacitors. Using SnPb
solder on Sn boards and parts should work fine, assuming your assemblies
are not RoHS-compliant. We (persons I work for) have had no problems so
far, don't anticipate any.
Besides semantics, in which your customer may be worrying about a
non-existent problem, me thinks Bob's analysis is correct.
Roger
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Connitt
Sent: Monday, September 29, 2008 12:56 PM
To: [log in to unmask]
Subject: Re: [TN] HAL finished circuit boards
Actually,
The boards are HAL, not HASL finish. At least that's what he told me..
I was just wondering if there could be any detrimental effects from
switching from HASL to HAL and use the same 63/37 resin core solder. I
am not too sure what he is using the flux for if the solder has flux in
it already. Just relaying information.
Dave Connitt
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Willis
Sent: Monday, September 29, 2008 12:44 PM
To: [log in to unmask]
Subject: Re: [TN] HAL finished circuit boards
If you have HASL Hot Air Solder Levelled boards and tin finish component
and they are both solderable why would you need to use a highly
activated flux?
Any no clean product from many industry suppliers should work perfectly
well.
Many thanks, sorry to give a basic answer?
Bob Willis
2 Fourth Ave, Chelmsford, Essex, CM1 4HA England
Tel: (44) 1245 351502
Fax: (44) 1245 496123
Mobile: 07860 775858
www.ASKbobwillis.com
New Bob Willis "Printed Board Inspection & Quality Control Workshop"
24th March www.ASKbobwillis.com/faworkshops.pdf
"Troubleshooting Your Assembly Yields Workshop" 25th March
www.ASKbobwillis.com/faworkshops.pdf
Book Bob's "Step by Step Failure Analysis Workshop" 22nd April
www.ASKbobwillis.com/faworkshops.pdf
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: 29 September 2008 17:12
To: [log in to unmask]
Subject: Re: [TN] HAL finished circuit boards
".....very active flux and 63/37 resin core solder......."
Sounds gruesome mixture.
The impact: a rigorous cleaning procedure would be required What that
would be would depend on which very active flux and what type resin?
Regards
Mike Fenner
Indium Corporation
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Connitt
Sent: Monday, September 29, 2008 12:33 PM
To: [log in to unmask]
Subject: [TN] HAL finished circuit boards
Good Morning,
Is there any negative or positive impacts of assemblying HAL coated
boards with some parts being tin only using hand soldering with very
active flux and 63/37 resin core solder? An old customer asked me this
over the weekend and I thought I would forward the question to the list.
Thanks,
Dave Connitt CID+
Printed Circuit Designer
KDI Precision Products, Inc.
A Wholly Owned Subsidiary of:
L3 Communications
3975 McMann Road
Cincinnati, Ohio 45245
Ph. 513- 943-2010 Fax 513-943-2288
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