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Tue, 18 Aug 1998 16:32:15 -0500 |
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Rob, Isn't HASL a wonder thing! We deal with the same thing every
day! HASL is, in my opinion, a very "gothic" technology with a lot
of short comings especially process controllability! The only cure I
see is using a different PCB finish. This is also on our to-do list!
Mark P
ADC Telecom.
______________________________ Reply Separator
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Subject: [TN] PC Board Surface Mount Solderability
Author: "TechNet E-Mail Forum." <[log in to unmask]> Rob
Carrillo
<[log in to unmask]> at Internet-Mail
Date: 8/18/98 3:34 PM
Is there a standard for planarity and thickness of surface mount pads.
Many
of boards received exhibit uneven HAL, yet meet MIL-PRF-55110F. As a
result, the side of the pad with the thinner solder coat exhibits
advanced
stages of intermetallic growth. How do we, as an end user control this
with
our supplier base?
Regards,
Rob Carrillo
Supplier Quality Engineer
Electronic Systems Division
Aerospace Group
Parker Hannifin Corp.
300 Marcus Blvd.
Smithtown, NY 11787
Tel: (516) 231-3737 X2049
Fax: (516) 348-1592
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