Electronics Forum | Tue Oct 03 17:11:42 EDT 2006 | cuculi54986@yahoo.com
Our board suppliers tell us, there is no specification they use for HASL thickness, other than "coverage". They also say they have very little control over the HASL thickness. This was not an issue for us in the past, until we started using Pb-fr
Electronics Forum | Mon Jun 14 11:44:23 EDT 2004 | Dreamsniper
I have boards with bad HASL application. First they're not even. Second some pad edges have no HASL and still remains bare copper. What's the maximum and minimum HASL thickness required for a good solderability. My boards are about 6 weeks old, I kno
Electronics Forum | Mon Jun 14 14:39:12 EDT 2004 | davef
HASL Thickness: * HADCO DFM manual specifies a nominal thickness of 50-1500uin with an option for 100-1000uin * Merix DFM manual specifies 30-200uin IPC-6012, Class 1, 2, 3 do not spec a HASL thickness at all but only require that full coverage is m
Electronics Forum | Tue Jul 27 07:18:44 EDT 2004 | Nippy
How does the HASL finish and stencil match ? I have seen ocasions on fine pitch devices where the HASL can protrude into the stencil aperture either pulling paste down on the snap off or completely blocking the aperture and getting no paste.
Electronics Forum | Wed Jun 28 12:29:59 EDT 2000 | Christopher Lampron
Does anyone know what the min-max plating thickness for HASL is? Is there a specification that defines this requirement? We have had problems with PCB's that have excessive solder plating on the pads. This wreaks havok with our QFP's. Any help would
Electronics Forum | Wed Jun 28 12:29:56 EDT 2000 | Christopher Lampron
Does anyone know what the min-max plating thickness for HASL is? Is there a specification that defines this requirement? We have had problems with PCB's that have excessive solder plating on the pads. This wreaks havok with our QFP's. Any help would
Electronics Forum | Sun Jun 29 15:03:04 EDT 2008 | jensteele
I was referring to the HASL supplied by the supplier...specifically Lead Free HASL. I've been searching the web and I cannot find a thickness specification like we have for ENIG and Immersion Silver.
Electronics Forum | Tue Aug 03 17:13:41 EDT 2010 | bradlanger
Craig, If it is LF Hasl it sounds like it applied too thin exposing the intermetallic layer wich is not solderable. We call out a minimum thickness of 80 microinches and have good results. We have had shops in the past that did not control the Hasl
Electronics Forum | Tue May 31 10:44:16 EDT 2005 | Scott B
We have found that when the HASL thickness is less than 5 microns the tin in the HASL reacts with the copper leaving a SnCu surface with poor solderability and microscopic grainy Pb islands. The IPC does not specify minimum HASL thickness but we now
Electronics Forum | Mon Jun 30 08:55:31 EDT 2008 | davef
It will be tough to find a dimensional thickness specification for HASL. IPC-6012 Table 3-2, line "Fused tin-lead or solder coat - Coverage and Solderable" states the requirement that there has to be complete coverage of solder on the land, and it mu
