Electronics Forum | Thu Nov 02 12:18:31 EST 2006 | pbarton
What surface finish is your PCB?
Electronics Forum | Thu Apr 17 05:14:40 EDT 2008 | gregoryyork
I have seen similar things like this before with Solder Resist redepositig back on the pads, this is a clear residue very hard to see. Solder resist will obviously resist solder adhering to it. If you rework the boards then the heat of the iron will
Electronics Forum | Wed Jan 13 04:07:58 EST 2016 | crystalpcb
Hi Syed, I'm a PCB engineer from China. First:Immersion gold surface finish is the best for PCBs. Second:HASL(Lead-Free HASL) Then:HAL(with lead) The cheapest surface finish is OSP(After 15 days will be oxidized)
Electronics Forum | Fri Jul 23 06:48:23 EDT 2004 | mattkehoe
I am actually getting opinions that point to contaminated copper under the HASL finish. We've seen some "fish eyes" where the HASL is pulled away from the copper exposing a pin hole of copper that can be seen through the HASL finsh. We are planning o
Electronics Forum | Thu Jan 15 08:39:26 EST 2004 | Patrick
Thanks for the reply, I do know that the HASL finish is "domed " on opposite sides of a QFP site & "smooth" on the other two sides. (ie. Sides 1 & 3 are domed, & sides 2 & 4 are smooth ) depending on the direction the PCB was extracted from sol
Electronics Forum | Wed Oct 30 13:35:45 EDT 2019 | emeto
We prefer Flat finish. We don't like HASL.
Electronics Forum | Mon Jun 14 10:23:53 EDT 2010 | pcrane
I have CCA that has a SN100C HASL coating that I am wave soldering with SbPb. I have mounting pad areas on the CCA that are masked with a pallet during reflow so they are not exposed to the solder. The mounting pads are turning gray in some areas of
Electronics Forum | Tue Mar 24 09:50:45 EST 1998 | Justin Medernach
| Do I need to specify any type of special | finishing to my PCB manufacturer when having | boards fabbed that contain BGA footprints ??? | Thanks, | Stuart No special finish is required. I have assembled boards with BGA population that had HASL,
Electronics Forum | Wed Feb 16 08:03:04 EST 2000 | Dave F
Steve: Fused HASL is a routine HASL coating that has been reflowed, giving it a flatter, less domed surface. Awww ol' Moonie always liked to set things like "fused HASL" straight, at least from the perspective of ... Ta Dave F
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.
