Electronics Forum | Thu Jul 03 19:27:54 EDT 2008 | proy
5 Zone HVA70 Oven Board 6 layer, 10" x 13" lots of space, most critical is 100 pin QFP AIM Water Soluble 487 Tin Lead paste on SN100C HASL boards This board is giving me disproportionate grief! I am running 23 in / min which gives me about 3.1 mi
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 | Wed Jul 15 12:20:52 EDT 2015 | dyoungquist
If you are using lead solder (SnPb) HASL is a good choice. If you are using lead-free (RoHS compliant) solder then I would recommend Immersion Gold (ENIG).
Electronics Forum | Thu Aug 04 15:53:07 EDT 2005 | GS
Hi Ted, look at this tread: Lead-free solder alloy: SN100C from AIM solder then see note of Bob Gilbert (from FCT Assembly) you can have from him very interesting documentation CD about HASL made by SN100C alloy Regards GS
Electronics Forum | Fri Jun 07 09:39:06 EDT 2019 | cristian_amlima
I totally agree with you when whe talk about a lead-free process. In my early comment I thought we were talking about a tin-lead process with the pcb pb-free, when the solder paste limits should be respected. That is the motive the temperatures I sa
Electronics Forum | Tue Aug 20 08:29:57 EDT 2013 | proceng1
When bridging becomes an issue, I like short leads. Lead Free is where I see most bridging occur. Usually when lead length starts to approach lead spacing. As long as the lead is discernible in the joint, it's acceptable. If you are having troubl
Electronics Forum | Fri Apr 30 08:28:39 EDT 2004 | davef
Roger Saunders, President Saunders Technology, Inc wrote a fairly unbiased paper that compared different thermocouple attach methods. You can probably find it on their site. In it, about gluing thermocouples, he says: There are two general classes
Electronics Forum | Mon Sep 25 16:37:18 EDT 2000 | jackofalltrades
I would have to ask the same question as Wolfgang, we use DEK's (249, 255, & 265) for whatever paste happens to required for a particular PCB, with no unique trouble.
Electronics Forum | Wed Mar 12 15:26:46 EDT 2014 | dan_ems
Hello, in my SMT process I have some problems with the solderability (look like dewetting) on a PCB with finish HASL Lead Free with a composition that is melt at 230 degree Celsius. My oven is with vapor phase and the peak temperature is 230 degre
Electronics Forum | Thu Mar 13 14:12:31 EDT 2014 | davef
You're creating a new alloy on the surface of your board. The alloy will have a melting point determined by the constituent metals of the alloy. Your alloy consists of: * Lead-free HASL solderability protection on the board * Lead-free solder paste *
