Electronics Forum | Tue Apr 29 07:38:42 EDT 2008 | davef
Warpage typically (not always) kinda, sorta points to a fabrication bake induced issue that is the racking technique & may be relieved by "flat baking" under weight. Your baking at 125* won't do dip. You need to get the laminate temperature above it'
Electronics Forum | Thu May 01 18:14:19 EDT 2008 | jmelson
Yup, this is pretty scary, all right. I have just used up the last FPGAs of a batch we bought from a Chinese source. Never again! Some of them worked, some didn't, in a variety of nefarious ways. People cautined me about empty packages, etc. Wel
Electronics Forum | Thu May 01 23:46:55 EDT 2008 | lellis
Revealing trade secrets to achieve what a company can do to make money is a "touchy" situation. Especially on a forum where people are asking for help. Our company has the capability to remove your markings, and reapply them in several techniques.
Electronics Forum | Thu May 01 12:46:19 EDT 2008 | dphilbrick
Thanks for the link Samir. Although this thread does have some good info in it I don't think it is hitting the exact point I am trying to resolve. This seems to talk to a one profile fits all for running lead and lead free paste. I want to know about
Electronics Forum | Thu May 01 15:11:37 EDT 2008 | dphilbrick
CK So as I see it batch B represents a leaded process with leaded components and D is a leaded process with lead free components. Batch Components Paste B SnPb Sn62 D Lead-free Sn62 If so it is BETTER to run a lead free BGA with Sn
Electronics Forum | Thu May 01 10:51:09 EDT 2008 | realchunks
You need a paste designed specifically for this. They are available. Most have 2% silver in them and higher temp flux so you can reflow at "no-lead" temps. The silver aids in the intermaetalic bond and the high temp flux allows you to reflow the n
Electronics Forum | Fri May 02 16:20:35 EDT 2008 | rwyman
We've never, to my knowledge, sent out Pb-free BGAs to be reballed for use on an SnPb assembly. In fact, we developed an in-house reballing process and we haven't felt the need to do that either (for salvaging an occasional reworked part, maybe).
Electronics Forum | Thu May 08 09:36:23 EDT 2008 | ck_the_flip
CSullivan, On the great SMTNet archives, there was much discussion about how to run in this scenario. Here is one such thread: http://www.smtnet.com//forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=10483&#Message42337 Also, I wouldn't "
Electronics Forum | Thu May 01 12:28:56 EDT 2008 | petergog
what is the main concern about this reqirement? Why IPC-A-610c is revsised to this? IPC-A-610c said it is a defect.Solder touches the body of a plastic bodied component, eg SOICs and SOTs. But D version think it is acceptable. WHY? I thought "plasti
Electronics Forum | Thu May 01 18:26:50 EDT 2008 | jmelson
I am partial to Weller for the small rework irons. I use both the WSL with WMP (current model) and some older EC1302 irons with their power supply (I forget the model, but the one with analog setting knob and digital temp readout). I actually prefe
