Electronics Forum | Thu Jun 29 07:48:59 EDT 2000 | Mark
Welcome Bob, HASL stands for "Hot Air Solder Level" and is the final finish the raw boards guys place on the solder pads on the PCB. There are two popular raw board finishes, HASL which is a solder finish and NiAu which is Nickle Gold, and is a Gol
Electronics Forum | Thu Jul 25 21:58:20 EDT 2002 | davef
How do you �physically remove the solder from the fiducal prior to disposing of the balance of the rail�? We don�t HASL our fiducals. Easier to see with vid head. If you need to HASL your fiducals, consider: * Disposing of the rails with your scra
Electronics Forum | Fri Sep 13 14:35:03 EDT 2002 | davef
Thanks Bernard. On your profile: Adding gold to your solder alloy will increase the liquious temperature. So slowing your reflow oven conveyor is a perfectly reasonable approach, especially for pads with low surface area. We don't even notice a di
Electronics Forum | Thu Dec 18 15:48:25 EST 2003 | Subhash Nariani
Hello, Does anyone have experience with the PCB assembly of 0.5mm pitch chip scale packages with HASL finish? Characterization data that you can share? Tribal knowledge has it that the height variations of the solder prevent the use of HASL for fin
Electronics Forum | Thu Dec 18 23:44:53 EST 2003 | Dean
...don't expect high yields with hasl on that device. Yeah, you an do it. But not reliably. Also, factor in board warp, bump tolerance AND HASL variation....recipe for disaster. can your process toleate a selective gold on the one device? How ab
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 | 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 | Wed Dec 22 12:36:36 EST 2004 | rlackey
Hi Mark, Look on the bright side, if you want to change from HASL you've got the lead free issue which will allow you to evaluate all other finishes, and find the best one for you. Dave, have you seen any unleaded HASL finishes & any issues arising
Electronics Forum | Tue Mar 15 10:44:42 EST 2005 | jdengler
-If the aperture volume is the same, there will be more solder on the HASL finish joint due to the solder already present on the pad. This difference is not usually enough to cause insufficiant solder volume but will "look different". Sometimes an
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
